This list of ammonites is a comprehensive listing of

genera Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial ...

that are included in the subclass †

Ammonoidea Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid and cuttl ...

, excluding purely vernacular terms. The list includes genera that are commonly accepted as valid, as well those that may be invalid or doubtful (''

nomina dubia In binomial nomenclature, a ''nomen dubium'' (Latin for "doubtful name", plural ''nomina dubia'') is a scientific name that is of unknown or doubtful application. Zoology In case of a ''nomen dubium'' it may be impossible to determine whether a s ...

''), or were not formally published (''

nomina nuda In taxonomy, a ''nomen nudum'' ('naked name'; plural ''nomina nuda'') is a designation which looks exactly like a scientific name of an organism, and may have originally been intended to be one, but it has not been published with an adequate desc ...

''), as well as

junior synonyms The Botanical and Zoological Codes of nomenclature treat the concept of synonymy differently. * In botanical nomenclature, a synonym is a scientific name that applies to a taxon that (now) goes by a different scientific name. For example, Linnae ...

of more established names, and genera that are no longer considered ammonites. __NOTOC__

Reliability of this list

Most of the generic names in this list come from

Jack Sepkoski Joseph John Sepkoski Jr. (July 26, 1948 – May 1, 1999) was a University of Chicago paleontologist. Sepkoski studied the fossil record and the diversity of life on Earth. Sepkoski and David Raup contributed to the knowledge of extinction events ...

's 2002 compendium of marine fossil genera, which can be corroborated by other sources such as Part L, Ammonoidea, in the

Treatise on Invertebrate Paleontology The ''Treatise on Invertebrate Paleontology'' (or ''TIP'') published by the Geological Society of America and the University of Kansas Press, is a definitive multi-authored work of some 50 volumes, written by more than 300 paleontologists, and co ...

. Additional generic names included come from the Treatise or various peer review scientific journals. 150px, Ammolite is an iridescent gem stone">iridescent.html" ;"title="Ammolite is an iridescent">Ammolite is an iridescent gem stone made from the shells of fossil ammonites

A

file:Arcestes.jpg, 150px, The Triassic ammonites ''Arcestes, Arcestes intuslabiatus'' (top) and ''Arcestes, A. binacostomus'' (bottom), from what is now Austria Annuloceras summersi">file:Annuloceras summersi.JPG, 150px, Reconstruction of '' Annuloceras summersi''. 150px, '' Asteroceras'', a Jurassic ammonite from England.">Jurassic<_a>_ammonite_from_England.html" ;"title="Asteroceras'', a Jurassic ammonite from England">Asteroceras'', a Jurassic ammonite from England.

Ab

*''Abbasites'' *''Abichites'' *''Abrytasites''

Ac

*''Acanthaecites'' *''Acanthinites'' *''Acanthoceras (ammonite), Acanthoceras'' *''Acanthoceratites'' *''Acanthoclymenia'' *''

Acanthodiscus ''Acanthodiscus'' is an extinct ammonoid cephalopod genus from the order Ammonitida and included in the persphinctacean family Berriasellidae. The type species, named by Bruguière, 1792, is ''Acanthodiscus radiatus''.Acanthohoplites'' *'' Acantholytoceras'' *'' Acanthopleuroceras'' *'' Acanthoplites'' *'' Acanthoscaphites'' *'' Accardia'' *'' Achilleoceras'' *'' Acompsoceras'' *''

Aconeceras ''Aconeceras'' is an early Cretaceous ammonite included in the oppeliid subfamily Aconeceratidae, characterized by an involute, high-whorled, flat-sided shell that bears a finely serrate keel along the venter. Sutures have narrower and deeper ele ...

'' *'' Acriclymenia'' *''

Acrimeroceras ''Acrimeroceras'' is an oxyconic Devonian goniatite and one of three genera included in the subfamily Paratornoceratinae. The others being '' Paratornoceras'' and ''Paratoceras'' or ''ex'' '' Polonites''. ''Acrimeroceras'' has a shell like ...

'' *''

Acrioceras ''Acrioceras'' is an extinct genus of cephalopods belonging to the ammonite subclass. with and (1996), ''Mollusca 4 Revised , Cretaceous Ammonoidea'', vol. 4, in ''Treatise on Invertebrate Paleontology'', Part L (Roger L. Kaesler et el. eds. ...

'' *'' Acrocanites'' *''

Acrochordiceras ''Acrochordiceras'' is a genus of Middle Triassic ammonoid cephalopods belonging to the ceratitid family Acrochordiceratidae, included in the superfamily Ceratitoidea. The shell of ''Acrochordiceras'', as with the family, is more or less involut ...

'' *''

Acuariceras ''Acuariceras'' is an extinct genus of cephalopod belonging to the Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are ...

'' *''

Acuticostites ''Acuticostites'' is an extinct genus of cephalopod belonging to the Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, ...

'' *''

Acutimitoceras ''Acutimitoceras'' is a genus belonging to the Acutimitoceratinae subfamily of the Prionoceratidae family, a member of the Goniatitida order. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, o ...

*''

Adkinsia ''Adkinsia'' is an extinct genus of cephalopod belonging to the Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are mor ...

'' *''

Adkinsites ''Adkinsites'' is an extinct genus of cephalopod belonging to the Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are ...

'' *''

Adnethiceras ''Adnethiceras'' is an extinct genus of Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to livi ...

'' *''

Adrianites ''Adrianites'' is an extinct genus of the Adrianitidae family. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, octopodes, and cuttlefish Cuttlefish or cuttles are marine molluscs of the o ...

Ae

*''

Aegasteroceras ''Aegasteroceras'' is an extinct cephalopod genus from the Lower Jurassic belonging to the arietitid subfamily Asteroceratinae. The shell of ''Aegasteroceras'' is evolute with curve forward and meet at a broad low ventral keel.W.J. Arkell et al ...

'' *''

Aegoceras ''Aegoceras'' is an evolutionary wound ammonite, with wide spaced ribs, from the Early Jurassic (England) included in the Liparoceratidae and superfamily Eoderoceratidae Eoderoceratidae is the ancestral and most primitive family of the Eode ...

'' *'' Aegocrioceras'' *''

Aegolytoceras ''Aegolytoceras'' is an extinct genus of cephalopod belonging to the Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, ar ...

'' *'' Aenigmatoceras''

Ag

*''

Agassiceras ''Agassiceras'' is a Lower Jurassic ammonite from the Sinemurian stage in Europe. ''Agassiceras'' belongs to the psiloceratacean family, Arietitidae, and is characterized by being compressed with a sharp venter and feeble straight ribs that may b ...

'' *''

Agastrioceras ''Agastrioceras'' is a genus of cephalopod belonging to the Reticuloceratidae family. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish Cuttlefish or cuttles are mar ...

'' *'' Agathiceras'' *''

Agoniatites ''Agoniatites'' is a genus of primitive ammonoids belonging to the order Agoniatitida family Agoniatitidae. Species of this genus were fast-moving nektonic carnivore shelled ammonoids. They lived in the Eifelian and Givetian ages of the middle De ...

Ai

*''

Ainoceras ''Ainoceras'' ("Ainu's Horn") is a genus of extinct, aberrantly coiled ammonite cephalopod that live in the Pacific Ocean during the Campanian division of the Cretaceous, where Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku ...

'' *'' Aioloceras''

Ak

*'' Akmilleria'' *'' Aktubinskia'' *''

Aktubites ''Aktubites'' is a genus belonging to the Parashumarditidae family. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish Cuttlefish or cuttles are marine molluscs of t ...

'' *''

Aktuboclymenia ''Aktuboclymenia'' is an extinct genus of ammonites that existed during the Devonian The Devonian ( ) is a geologic period and system of the Paleozoic era, spanning 60.3 million years from the end of the Silurian, million years ago ...

Al

*''

Alanites ''Alanites'' is a genus of extinct Triassic ammonoid cephalopods named by Shevyrev, 1968, found in association with '' Laboceras'' and '' Megaphyllites'' in Siberia and assigned to the ceratitid Ceratitida is an order that contains almost al ...

'' *''

Alaoceras ''Alaoceras'' is an ammonoid cephalopod from the upper Paleozoic included in the goniatitid family Cravenoceratidae, named by Ruzhentsev & Bogoslovskaya in 1971. ''Alaoceras'' is characterized by its generally subdiscoidal shell with moderatel ...

'' *'' Albanites'' *''

Alcidellus ''Alcidellus'' is an oxyconic (sharp ventered) haploceratacean ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more ...

'' *''

Aldanites ''Aldanites'' is an extinct cephalopod genus belonging to the ammonoid order Goniatitida Goniatids, informally goniatites, are Ammonoidea, ammonoid cephalopods that form the order Goniatitida, derived from the more primitive Agoniatitida durin ...

'' *''

Alfeldites ''Alfeldites'' is an extinct genus of cephalopod belonging to the Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are m ...

'' *''

Algericeras ''Algericeras'' is an extinct ammonite genus belonging to the superfamily Acanthoceratoidea that lived during the Cenomanian The Cenomanian is, in the ICS' geological timescale, the oldest or earliest age of the Late Cretaceous Epoch or the l ...

'' *''

Algerites ''Algerites'' is middle Cretaceous (Cenomanian) anisoceratid ammonoid with a close-coiled adult shell in which the whorls at that stage are in close contact, after starting off with openly coiled whorls, and in which every rib (a character of the ...

'' *''

Alligaticeras ''Alligaticeras'' is an extinct genus of cephalopod belonging to the ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, ar ...

'' *'' Alloceratites'' *'' Alloclionites'' *''

Allocrioceras ''Allocrioceras'' is an ammonoid cephalopod from the Turonian to Santonian stages of the Late Cretaceous, included in the turrilitoid family Anisoceratidae. Its shell is strongly ribbed and is in the form of a widely open spiral. Classificatio ...

'' *''

Alloptychites ''Alloptychites'' is an extinct genus of cephalopods belonging to the ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, a ...

'' *''

Almites ''Almites'' is a genus belonging to the Marathonitidae families. They are an extinct group of ammonoids, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish, and more distantly to the nautiloid Nautiloids ar ...

'' *''

Almohadites ''Almohadites'' is an extinct genus of cephalopod belonging to the ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are ...

'' *''

Alocolytoceras ''Alocolytoceras'' is a lytoceratid ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living ...

'' *''

Alpinites ''Alpinites'' is a genus belonging to the Discoclymeniinae subfamily, a member of the Goniatitida order. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish, and more dist ...

'' *''

Alsatites ''Alsatites '' is an extinct genus of cephalopod belonging to the Ammonite subclass. They lived during the Early Jurassic, Hettangian till the Sinemurian In the geologic timescale, the Sinemurian is an age and stage in the Early or Lower J ...

'' *'' Altudoceras'' *''

Alurites ''Alurites'' is a genus belonging to the Gastriocerataceae superfamily. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish Cuttlefish or cuttles are marine molluscs o ...

Am

*''

Amaltheus ''Amaltheus'' is an oxyconic ammonite with a fairly open umbilicus, serrated keel, and slightly sigmoidal ribs from the Lower Jurassic, many of which are strigate. ''Amaltheus'', named by de Montfort, 1808, is indicative of the upper Pliensbach ...

'' *'' Amarassites'' *''

Amauroceras ''Amauroceras'' is an extinct genus of eoderoceratacean ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more clos ...

'' *'' Ambites'' *''

Ammonellipsites ''Ammonellipsites'' is a genus belonging to the Ammonellipsitinae subfamily. They are an extinct group of ammonoids, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish Cuttlefish or cuttles are marine mo ...

'' *''

Ammonitoceras ''Ammonitoceras'' is an extinct genus of cephalopod belonging to the ammonite subclass that lived during the latter part of the Early Cretaceous in what is now Europe and the transcaspian region. ''Ammonitoceras'' was named by Dumas, 1876, the ...

'' *'' Ammonoceratites'' *''

Amoebites ''Amoeboceras'' is an extinct genus of ammonite cephalopod closely related to the genus ''Cardioceras''. Fossils are found in Late Jurassic-aged marine strata of Europe and Russia Russia (, , ), or the Russian Federation, is a List of t ...

'' *'' Amoeboceras'' *'' Amorina'' *''

Amphipoanoceras ''Amphipoanoceras'' is an extinct genus of cephalopod belonging to the Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, ...

'' *''

Amphistephanites ''Amphistephanites'' is an extinct genus of cephalopod belonging to the ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, ...

'' *''

Ampthillia ''Ampthillia'' is an extinct genus of cephalopod belonging to the Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are m ...

An

*''

Anacleoniceras ''Anacleoniceras'' is an extinct genus of cephalopod belonging to the Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, ...

'' *''

Anadesmoceras ''Anadesmoceras'' is an hoplitid ammonite from the lower Albian (upper Lower Cretaceous) of England, included in the subfamily Cleoniceratinae. ''Anadesmoceras'' has a shell shaped more or less like a compressed ''Cleoniceras ''Cleoniceras'' i ...

'' *''

Anaflemingites ''Anaflemingites'' is an extinct genus of cephalopods belonging to the Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, ...

'' *''

Anagaudryceras ''Anagaudryceras'' is an extinct genus of ammonite from the later Cretaceous belonging to the Ammonoidea family Gaudryceratidae Gaudryceratidae is a family belonging to the extinct Ammonoidea, ammonoid suborder Lytoceratina that lived from the ...

'' *'' Anagymnites'' *'' Anagymnotoceras'' *'' Anahamulina'' *''

Anahoplites ''Anahoplites'' is a genus of rather involute, compressed hoplitid ammonites Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, ...

'' *''

Anaklinoceras ''Anaklinoceras'' is a genus of extinct heteromorph ammonite cephalopod that lived in marine environments in what is now Western North America during the Campanian division of the Cretaceous period. Their shells were very similar to the related ...

'' *''

Analytoceras ''Analytoceras'' is an extinct genus of cephalopod belonging to the Ammonite subclass that lived during the early Jurassic. ''Analytoceras'', named by Alpheus Hyatt in 1900, is a lytoceratid Lytoceratidae is a taxonomic family of ammonoid cepha ...

'' *'' Ananorites'' *''

Anapachydiscus ''Anapachydiscus'' is an extinct cephalopod genus from the Upper Cretaceous, Santonian - Maastrichtian of Europe, Africa, Madagascar, S.India, N Z, Calif. Mexico, Argentina, and the Antarctic belonging to the ammonoid family Pachydiscidae. ''Ana ...

'' *'' Anarcestes'' *''

Anascaphites ''Anascaphites'' is an extinct genus of cephalopod belonging to the Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are ...

'' *''

Anasibirites ''Anasibirites'' is an extinct genus of ammonoid cephalopod from the lower upper Smithian '' Wasatchites distractus'' Zone (Olenekian, Lower Triassic). Distribution and diversity ''Anasibirites'' is characterized by a cosmopolitan distribution, ...

'' *''

Anasirenites ''Anasirenites'' is a genus of extinct ammonoid cephalopods within the family Trachyceratidae which is part of the ceratitid superfamily Clydonitaceae; sometimes considered a subgenus of '' Sirenites''. ''Anasirenites'' is characterized by a ven ...

'' *''

Anatibetites ''Anatibetites'' is an extinct genus of cephalopods belonging to the Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, a ...

'' *''

Anatomites ''Anatomites'' is an extinct genus of cephalopod belonging to the Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are ...

'' *''

Anatropites ''Anatropites'' is a genus of ammonite in the ceratitid family Tropitidae with spines instead of nodes on the umbilical shoulder, at least in early whorls.Arkell et al. Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L, Ammonoide ...

'' *''

Anatsabites ''Anatsabites'' is a monospecific genus of ammonoid cephalopods belonging to the Paragastrioceratidae family. The only species is ''Anatsabites multiliratus'' (Plummer & Scott, 1937), formerly placed into genus ''Paraceltites''. Its fossils were ...

'' *'' Anavirgatites'' *''

Anaxenaspis ''Anaxenaspis'' is an extinct genus of cephalopod belonging to the Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are ...

'' *''

Anclyoceras ''Ancyloceras'' is an extinct genus of heteromorph ammonites found throughout the world during the Lower Cretaceous, from the Lower Barremian epoch until the genus extinction during the Lower Aptian.Sepkoski, JacSepkoski's Online Genus Database � ...

'' *''

Ancolioceras ''Ancolioceras'' is an extinct genus of cephalopod belonging to the ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are ...

'' *''

Andersonites ''Andersonites'' is an extinct genus of cephalopod belonging to the Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are ...

'' *''

Anderssonoceras ''Anderssonoceras'' is a genus of small, smooth ammonites with a flared umbilical shoulder, like '' Prototoceras'', assigned to the ceratitid family Anderssonoceratidae as the type, but once included in the Otoceratidae. ''Anderssonoceras'' com ...

'' *''

Andesites ''Andesites'' is an extinct genus of cephalopod belonging to the Ammonite subclass, from the Late Jurassic. It has only been found in the Mendoza Group of Argentina Argentina (), officially the Argentine Republic ( es, link=no, Repúb ...

'' *''

Andiceras ''Andiceras'' is an enigmatic perisphinctacean ammonite belonging to the neocomitid subfamily Berriasellinae. ''Andiceras'' was named by Krantz in 1926 and is known from Tithonian sediments in Argentina and the Chinameca and La Caja Formations ...

'' *''

Androgynoceras ''Androgynoceras'' is an extinct genus of cephalopod belonging to the ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, a ...

'' *'' Anetoceras'' *''

Aneuretoceras ''Aneuretoceras'' is an extinct genus of cephalopod belonging to the Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, ar ...

'' *''

Anfaceras ''Anfaceras'' is an extinct genus of cephalopods belonging to the Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are ...

'' *'' Anglesites'' *''

Angranoceras ''Angranoceras'' is an extinct genus of cephalopod belonging to the Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are ...

'' *''

Angulaticeras ''Angulaticeras'' is an extinct genus of cephalopod belonging to the ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, ar ...

'' *''

Anisarcestes ''Anisarcestes'' is an extinct genus of cephalopod belonging to the Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, ar ...

'' *''

Anisoceras ''Anisoceras'' is a heteromorph ammonite belonging to the turrilitoid family Anisoceratidae Anisoceratidae is an extinct Family (biology), family of heteromorph ammonites which belong to the Ancyloceratina superfamily Turrilitoidea. Members o ...

'' *''

Ankinatsytes ''Ankinatsytes'' is an extinct genus of cephalopod belonging to the Ammonite subclass. The ammonite is from the Late Cretaceous of Colombia (Loma Gorda Formation) and Venezuela (La Luna Formation).Annuloceras ''Annuloceras'' ("Ringed Horns") is an extinct genus of ammonite cephalopod. Its fossils are found in Lower Barremian sediments from California California is a U.S. state, state in the Western United States, located along the West Coast ...

'' *''

Anolcites ''Anolcites'' is a genus of extinct ammonoid cephalopods from the Middle Triassic belonging to the ceratitid family Trachyceratidae. Specifically ''Anolcites'' is a middle Triassic trachyceriatid with no distinct ventral furrow and ribs that cro ...

'' *''

Anotoceras ''Anotoceras'' is a genus of smooth shelled, discoidal ammonites with a depressed, subtrigonal whorl section and ceratitic sutures included in the ceratitid family Otoceratidae. ''Anotoceras'' comes from the Lower Triassic of the Himalaya ...

'' *''

Antarcticoceras ''Antarcticoceras'' is a genus of crioconic ammonites in the family Shasticrioceratidae. It lived during the Early Cretaceous Period. ''Antarcticioceras'' fossils can be found in the Cretaceous rocks of Antarctica and South America.M.R.A. Tho ...

''M.R.A. Thomson, « Ammonite faunas of the Lower Cretaceous of south-eastern Alexander Island », ''British Antarctic Survey Scientific Reports'', 80 (1974), p.1-44. *''

Anthracoceras ''Anthracoceras'' is the type genus of the Goniatitida, goniatitid ammonoid family Anthracoceratidae whose species are found Mississippian-aged limestones in Eurasia, North America and Africa. References The Paleobiology Database
accessed on ...

'' *''

Anthracoceratites ''Anthracoceratites'' is an extinct genus of the Dimorphoceratidae family. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish Cuttlefish or cuttles are marine mollusc ...

'' *''

Anthracoceratoides ''Anthracoceratoides'' is a genus belonging to the Anthracoceratidae family. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish Cuttlefish or cuttles are marine mollu ...

Ap

*''

Aphantites ''Aphantites'' is a Lower Pennsylvanian ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to li ...

'' *''

Apleuroceras ''Apleuroceras'' is a genus of ceratitid ammonites with an essentially smooth evolute shell with a subquadrade whorl section and a ceratitic suture with two lateral lobes (on either side). ''Apleuroceras'' belongs to the Aplococeratidae and ha ...

'' *''

Aplococeras ''Aplococeras'' is an evolute discoidal ceratitid ammonite from the Middle Triassic Ladinian stage, found in southern Europe and Nevada. Whorl sides are convex, converging on a rounded venter (the outer rim), and are ornamented with slightly flex ...

'' *''

Apoderoceras ''Apoderoceras'' is an extinct genus of cephalopod belonging to the ammonite subclass. Biostratigraphic significance The International Commission on Stratigraphy (ICS) has assigned the First Appearance Datum of genus ''Apoderoceras'' and of '' ...

'' *'' Aposphinctoceras'' *''

Apsorroceras ''Apsorroceras'' is an extinct genus of cephalopod belonging to the Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are ...

Aq

*''

Aquilonites ''Aquilonites'' is a pericyclacean goniatitid belonging to the family Intoceratidae, suborder Goniatitina, that lived during the very early Carboniferous of what is now Russia. ''Aquilonites'' has a subdiscoidal, involute shell with a small to ...

Ar

*''

Araneites ''Araneites'' is a genus belonging to the Sporadoceratinae subfamily of the Prionoceratidae family, a member of the Goniatitida order. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, octopuses, ...

'' *''

Araxoceras ''Araxoceras'' is an extinct genus of ceratitid ammonites that lived in the Late Permian marine environments of Iran Iran, officially the Islamic Republic of Iran, and also called Persia, is a country located in Western Asia. ...

'' *''

Arcanoceras ''Arcanoceras'' is a genus belonging to the Eogonioloboceratidae family. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish, and more distantly to the nautiloid Nautil ...

'' *''

Arcestes ''Arcestes'' is a genus of extinct ceratitid ammonites found in Triassic-aged marine strata. Description Their shells were broad and rounded, giving them an almost spherical appearance. Unlike many other ammonites, the shells of ''Arcestes'' ...

'' *'' Archoceras'' *'' Arcthoplites'' *''

Arcticoceras ''Arcticoceras'' is an extinct ammonoid cephalopod genus from the late Middle Jurassic belonging to the ammonite family Cardioceratidae, more commonly found to high northern latitudes. The ''Arcticoceras'' shell is involute, inner whorls sharply ...

Ar (Cont.)

*'' Arctocephalites'' *''

Arctoceras ''Arctoceras'' is a genus of ceratitid ammonoids from the Lower Triassic with a moderately narrow discoidal shell and ceratitic suture.Arkell et al 1957, Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology Part L, R.C. Moore (ed), p L142 ...

'' *''

Arctogymnites ''Arctogymnites'' is a genus of ammonoid cephalopods from the middle Triassic included in the ceratitid subfamily Beyrichitinae. Related genera include '' Beyrichites'', ''Frechites'', '' Gymnotoceras'', and '' Salterites'' The Treatise Part L, ...

'' *'' Arctohungarites'' *''

Arctomeekoceras ''Arctomeekoceras'' is a genus of ammonoids in the order Ceratitida from the Early Triassic, included in the Meekoceratidae; a family characterized by more of less involute, compressed, discoidal forms that are smooth or weakly ornamented and ha ...

'' *''

Arctomercaticeras ''Arctomercaticeras'' is an extinct genus of cephalopod belonging to the Ammonite subclass and the family Hildoceratidae that lived during the Early Jurassic (Toarcian stage) in the Arctic zone of Russia Russia (, , ), or the Russian Fe ...

'' *''

Arctoprionites ''Arctoprionites'' is a genus of extinct ammonites (s.l.) from the Triassic, belonging to the ceratitid Ceratitida is an order that contains almost all ammonoid cephalopod genera from the Triassic as well as ancestral forms from the Upper Per ...

'' *'' Arctoptychites'' *''

Arctosirenites ''Arctosirenites'' is a genus of extinct ceratitid ammonoids from the Triassic of British Columbia and Nunavut, Canada, included in the Trachyceratidae. References ''Arctoserinites'' Paleodb Trachyceratidae Ceratitida genera Triassic amm ...

'' *'' Arctotirolites'' *''

Arestoceras ''Arestoceras'' is an extinct genus of cephalopod belonging to the Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are ...

'' *'' Argentiniceras'' *''

Argolites ''Argolites'' is an extinct genus of cephalopods belonging to the Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are m ...

'' *'' Argonauticeras'' *''

Argosirenites ''Argosirenites'' is an extinct genus of cephalopods belonging to the Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, ...

'' *'' Arianites'' *''

Aricoceras ''Aricoceras'' is an extinct genus of the Adrianitidae family. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish Cuttlefish or cuttles are marine molluscs of the o ...

'' *''

Arieticeras ''Arieticeras'' is an extinct genus of cephalopod belonging to the Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, ar ...

'' *'' Arietites'' *''

Arietoceltites ''Arietoceltites'' is an extinct genus of cephalopod belonging to the ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, a ...

'' *''

Arisphinctes ''Arisphinctes'' is an extinct genus of cephalopod belonging to the Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are ...

'' *''

Aristoceras ''Aristoceras'' is a Late Paleozoic goniatitid genus included in the Goniatitina suborder in which the lobes of the external suture are irregularly serrate. ''Aristoceras'', named by Ruzencev, 1950, may be a synonym for '' Euthalassoceras'' Mil ...

'' *''

Aristoceratoides ''Aristoceratoides'' is an extinct ammonoid genus belonging to the goniatitid family Thalassoceratidae that lived during the Middle Permian. Named by Ruzhentsev, 1960, the type species is ''"Thalassoceras" varicosum'' Gemmellaro, 1887. The she ...

'' *'' Aristoptychites'' *''

Arkanites ''Arkanites'' is a goniatitid ammonite that lived during the Early Pennsylvanian that has been found in Arkansas and Oklahoma in the U.S. Morphology The shell of ''Arkanites'' is subglobose, rather evolute, with a moderately wide umbilicus and ...

'' *''

Armatites ''Armatites'' is an Upper Devonian goniatitid included in the tornoceratid family. The shell, or conch, is discoidal, with flattened flanks, a flattened venter with a double keel, and a deep ventral sinus, but without ventrolateral grooves. Th ...

'' *''

Arnioceltites ''Arnioceltites'' is a genus of Late Triassic ammonites that has been found in the Alps, Sicily, and possibly in California. The shell is evolute and ribbed, with the outer whorls becoming smooth. ''Arnioceltities'' is included in the Tropic ...

'' *''

Arnioceras ''Arnioceras'' is an extinct genus of large, evolute, discoidal ammonite from the Lower Jurassic. The shell is normally coiled so that all whorls are exposed. Sides bear strong sharp ribs that are straight until reaching the ventrolateral edg ...

'' *''

Arniotites ''Arnioceras'' is an extinct genus of large, evolute, discoidal ammonite from the Lower Jurassic. The shell is normally coiled so that all whorls are exposed. Sides bear strong sharp ribs that are straight until reaching the ventrolateral edg ...

'' *''

Arpadites ''Arpadites'' is a genus of ceratitids in the family Trachyceratidae from the Middle and Upper Triassic (Ladinian and Carnian stages) of Nevada (United States),Francis Newlands Johnston. 1941Trias at New Pass, Nevada (New Lower Karnic Ammonoid ...

'' *'' Arthaberites'' *'' Artinksia'' *'' Artioceras'' *'' Artioceratoides''

As

*''

Asaphoceras ''Hypasteroceras'' is an extinct genus of cephalopod belonging to the ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, a ...

'' *'' Asapholytoceras'' *''

Asklepioceras ''Asklepioceras'' is a genus in the Ceratitid family Arpaditidae from the Middle and Upper Triassic (Ladinian and Carnian stages) of Italy, Romania, Turkey, and British Columbia (Canada). History The type species, ''Asklepioceras segmentatu ...

'' *''

Aspenites ''Aspenites'' is an extinct genus of cephalopod belonging to the Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are m ...

'' *''

Asphinctites ''Asphinctites'' is an extinct genus of cephalopod belonging to the Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are ...

'' *'' Aspidoceras'' *''

Aspidostephanus ''Aspidostephanus'' is an extinct cephalopod genus belonging to the ammonite subclass, included in the perisphinctacean family Olcostephanidae Olcostephanidae is an extinct ammonoid cephalopod family belonging to the superfamily Perisphinctoid ...

'' *''

Aspinoceras ''Aspinoceras'' is an extinct genus of heteromorph ammonites that lived during the Early Cretaceous. The shell small; starts off with a few loosely wound whorls not in contact followed by a short moderately curved shaft ending in a broad hook. ...

'' *'' Asteroceras'' *'' Asthenoceras'' *''

Astiericeras ''Astiericeras'' is an ammonite from the Lower Cretaceous The Cretaceous ( ) is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At aroun ...

'' *''

Astieridiscus ''Astieridiscus'' is an extinct lower Cretaceous ammonite. Its shell evolute, covered by dense, simple or branching, slightly flexuous ribs. The sides are slightly flattened, the venter rounded. No umbilical or other tubercles except on innermost ...

'' *''

Astreptoceras ''Astreptoceras'' is an extinct upper Cretaceous ammonoid Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely relat ...

'' *''

Asturoceras ''Asturoceras'' is an extinct late Paleozoic ammonoid cephalopod genus belonging to the Goniatitida Goniatids, informally goniatites, are Ammonoidea, ammonoid cephalopods that form the order Goniatitida, derived from the more primitive Agoniat ...

At

*''

Ataxioceras ''Ataxioceras'' is an extinct Ammonite cephalopod genus confined to the Upper Jurassic of Europe, included in the superfamily Perisphinctoidea. Previously ''Ataxioceras'' was assigned to the Perisphinctidae but has now been placed in the Ataxioc ...

'' *'' Atlantoceras'' *''

Atsabites ''Atsabites'' is an ammonoid Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., ...

Au

*'' Audaxlytoceras'' *'' Audouliceras'' *'' Augurites'' *''

Aulacaganides ''Aulacaganides'' is monospecific genus of a Middle Permian ammonite belonging to the goniatitid family Pseudohaloritidae Pseudohaloritidae is the larger of two families that form the goniatitid superfamily Pseudohaloritoidea, the other be ...

'' *'' Aulacosphinctes'' *'' Aulacosphinctoides'' *''

Aulacostephanus ''Aulacostephanus'' is an extinct ammonoid cephalopod genus from the Upper Jurassic Tithonian In the geological timescale, the Tithonian is the latest age of the Late Jurassic Epoch and the uppermost stage of the Upper Jurassic Series. It spa ...

'' *''

Aulasimoceras ''Aulasimoceras'' is an extinct genus of cephalopod belonging to the ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are ...

'' *''

Aulatornoceras ''Aulatornoceras'' is a genus belonging to the subfamily Aulatornoceratinae, a member of the Goniatitida, an extinct order of shelled cephalopods included in the Ammonoidea.

'' *''

Austiniceras ''Austiniceras'' is a subgenus of ''Parapuzosia ''Parapuzosia'' is an extinct genus of desmoceratid ammonites from the Cenomanian to the Campanian The Campanian is the fifth of six ages of the Late Cretaceous Epoch on the geologic ti ...

'' *''

Australiceras ''Australiceras'' is an extinct ammonite genus from the upper part of the Early Cretaceous, Aptian stage, included in the family Ancyloceratidae. Description ''Australiceras'' has an evolute shell, coiled with all whorls showing in keeping wit ...

'' *''

Austroceratites ''Austroceratites'' is a genus of extinct shelled cephalopods that lived during the Triassic, included in ammonoid order Ceratitida. Within the Ceratitida, ''Autroceratites'' belongs in the family Ceratitidae ''Ceratitidae'' is an extinct fam ...

'' *''

Austrotrachyceras ''Austrotrachyceras'' is a genus of ammonite cephalopod, belonging to the order Ceratitida. The family to which ''Austrotrachyceras'' belongs, Trachyceratidae The Trachyceratidae is an extinct family of ceratitid ammonoid cephalopods. The ...

Av

*''

Aveyroniceras ''Reynesoceras'' is genus of ammonites that lived during the upper Pliensbachian stage of early Jurassic. It has evolved from ''Prodactylioceras'', or ''Cetonoceras''. '' Dactylioceras (Eodactylites)'' has probably evolved from this genus. ''Av ...

Ax

*''

Axinolobus ''Axinolobus'' is a genus belonging to the Axinolobidae family. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish, and more distantly to the nautiloid Nautiloids are ...

'' *''

Axonoceras ''Axonoceras'' is a genus in the ammonitid family Nostoceratidae proposed by Stephenson in 1941, for "slender shells coiled in a plane with numerous closely spaced ribs and two rows of ventral nodes'...The shells may be closely coiled, though no ...

B

150px, Fragmented fossil specimens of '' Baculites'' Bostrychoceras polyplocum 01

*''

Bacchites ''Bacchites'' is a genus of extinct ammonoid cephalopods belonging to the ceratitid family Juvavitidae. ''Bacchites'', named by Smith, 1927, has a subspherical shell with the closed umbilicus, the surface of which is almost smooth except for f ...

'' *'' Bactrites'' *''

Baculina ''Baculina'' is an extinct ammonoid cephalopod genus belonging to the ancylocerid family Bochianitidae. ''Baculina'' is known from the Valanginian of the Lower Cretaceous. References *Arkell et al., 1957, Mesozoic Ammonoidea; Treatise on Inve ...

'' *''

Baculites ''Baculites'' ("walking stick rock") is an extinct genus of cephalopods with a nearly straight shell, included in the heteromorph ammonites. The genus, which lived worldwide throughout most of the Late Cretaceous, and which briefly survived the ...

'' *''

Badiotites ''Badiotites'' is a genus of extinct ammonoid cephalopods belonging to the ceratitid family Badiotitidae. It was previously included with '' Lecanites'' in the Lecanitidae, a family formerly of the Clydonitaceae but reassigned by Tozer (1981) to ...

'' *'' Bagnolites'' *''

Balatonites ''Balatonites'' is a genus of extinct cephalopods belonging to the ceratitid family Balatonitidae. There are at least four known species: ''B. balatonicus'', ''B. oyama'', ''B. shoshonensis'', and ''B. zitteli''. The shell of ''Balatonites'' is ...

'' *'' Balearites'' *''

Balkanites ''Balkanites'' is a genus of extinct ammonites (s.l.), belonging to the ceratitid superfamily Ceratitacea and family Tirolitidae. It is restricted to the Triassic period. As common to the family, the shell is evolute with lateral tubercles. The ...

'' *''

Balticeras ''Balticeras'' is an involute, discoidal Upper Jurassic (Oxfordian) ammonite (order Ammonitida) found in England, Germany, and Switzerland, belonging to the Perisphinctidae. The shell is strongly embracing, tending to be oxyconic (sharp rimmed). ...

'' *''

Balvia ''Balvia'' is an ammonoid cephalopod genus from the Upper Devonian belonging to the goniatitid family Prionoceratidae Prionoceratidae is one of seven families of the superfamily Prionoceratoidea, a member of the Goniatitida order. They are a ...

'' *'' Bamyaniceras'' *'' Barguesiella'' *''

Baronnites ''Baronnites'' is an ammonoid cephalopod from the upper Valanginian In the geologic timescale, the Valanginian is an age or stage of the Early or Lower Cretaceous. It spans between 139.8 ± 3.0 Ma and 132.9 ± 2.0 Ma (million years ago). The ...

'' *''

Barrandeites ''Barrandeites'' is an extinct genus of cephalopods belonging to the Ammonite subclass. It takes its name in honour of the paleontologist Joachim Barrande Joachim Barrande (11 August 1799 – 5 October 1883) was a French geologist and palaeonto ...

'' *''

Barremites ''Barremites'' is an Ammonoidea, ammonoid cephalopod genus belonging to the family Desmoceratidae, that lived during the Hauterivian and Barremian stages of the Early Cretaceous. Description Its shell is moderately to very involute, with the ...

'' *''

Barroisiceras ''Barroisiceras'' is an acanthoceratacean ammonite from the Upper Cretaceous, Coniacian, included in the family Collignoniceratidae. Diagnosis The shell of ''Barroisiceras'' is rather involute, coiled such that the outer whorl embraces much of ...

'' *''

Baschkirites ''Baschkirites'' is an extinct cephalopod genus belonging to the ammonoid order Goniatitida that lived during the Early Carboniferous (Bashkirian). Description The shell of ''Baschkirites'' is discoidal, with narrow umbilicus in adult stage. Gro ...

'' *''

Bashkortoceras ''Bashkortoceras'' is a genus belonging to the Gastrioceratoidea superfamily. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish Cuttlefish or cuttles are marine moll ...

'' *''

Baskaniiceras ''Baskaniiceras'' is an extinct genus of cephalopod belonging to the Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are ...

'' *''

Basleoceras Epadrianites is a genus of the Adrianitidae family. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish, and more distantly to the nautiloid Nautiloids are a group of ...

'' *''

Bastelia ''Bastelia'' is genus of ammonite from the Upper Hauterivian, during ''Balearites mortilleti'' zone and possibly also ''Pseudothurmannia angulicostata'' zone. Its fossils have been found in Switzerland (''B. schloegli'') and France ...

'' *''

Bauchioceras ''Bauchioceras'' is an extinct genus of cephalopod belonging to the Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are ...

'' *''

Bayleites ''Bayleites'' is an extinct genus of cephalopod belonging to the Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are mor ...

'' *''

Beaniceras ''Aegoceras'' (''Beaniceras'') is small, coarsely ribbed subgenus ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are m ...

'' *''

Beatites ''Beatites'' is a genus of Lower Triassic ammonites characterized by a somewhat strongly involute and greatly compressed shell with a sharp, oxyconic, venter. ''Beatites'' was first found in Albania and is assigned to the ceratatiid family Hede ...

'' *''

Behemoth Behemoth (; he, בְּהֵמוֹת, ''bəhēmōṯ'') is a beast from the biblical Book of Job, and is a form of the primeval chaos-monster created by God at the beginning of creation; he is paired with the other chaos-monster, Leviathan, and ...

'' *''

Beleutoceras ''Beleutoceras'' is a genus belonging to the Nomismoceratidae family. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish, and more distantly to the nautiloid Nautiloid ...

'' *''

Beloceras ''Beloceras'' is a genus of ammonites included in the family Beloceratidae. These fast-moving nektonic carnivores lived in the Late Devonian period, from 379.5 to 376.1 Ma. Similar and related genera include '' Eobeloceras'', '' Mesobeloceras'' ...

'' *''

Benacoceras ''Benacoceras'' is a strongly ribbed, evolute ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related t ...

'' *''

Beneckeia ''Beneckeia'' is a genus of Lower to Middle Triassic ammonites included in the ceratitid Ceratitida is an order that contains almost all ammonoid cephalopod genera from the Triassic as well as ancestral forms from the Upper Permian, the excep ...

'' *''

Benueites ''Benueites'' is an extinct ammonoid cephalopod genus from the Late Cretaceous (Turonian), named by Revment, 1954, included in the family Acanthoceratidae, superfamily Acanthoceratoidea. Distribution Cretaceous of Brazil, Cameroon, Colombia ( L ...

'' *''

Berbericeras ''Berbericeras'' is an extinct genus of cephalopod in the subclass Ammonoidea Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, ...

'' *''

Berniceras ''Berniceras'' is an extinct ammonite genus from the order Ammonitida that lived during the early Oxfordian stage of the Late Jurassic. ''Berniceras'' is included in the ammonite (''sensu stricto'') family, Oppeliidae Oppeliidae are compressed ...

'' *''

Berriasella ''Berriasella'' is a discoidal evolute perisphinctacean ammonite, and type genus for the neocomitid subfamily Berriasellinae. Its ribbing is distinct, consisting of both simple and bifurcated ribs that extend from the umbilical seam across the ...

'' *''

Berrosiceras ''Berrosiceras'' is an extinct genus of cephalopod belonging to the Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are ...

'' *''

Betyokites ''Betyokites'' is an extinct genus of cephalopod belonging to the Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are mo ...

'' *'' Beudanticeras'' *'' Beudantiella'' *'' Bevahites'' *''

Beyrichites ''Beyrichites'' is an extinct genus in the ammonoids cephalopod, order Ceratitida from the Lower and Middle Triassic of southern Europe, Asia, and western North America. ''Beyrichites'' has an involute, discoidal shell with a narrowly arched ve ...

'' *''

Beyrichoceras ''Beyrichoceras'' is a genus belonging to the goniatitid family Maxigoniatitidae Beyrichoceratoides ''Beyrichoceras'' is a genus belonging to the goniatitid family Muensteroceratidae, a group of ammonoids, extinct shelled cephalopods related to belemnites and recent coleoids and more distantly to the nautiloids Description ''Beyrichoceratoide ...

'' *''

Bhimaites ''Puzosia'' (''Bhimaites'') is a subgenus of desmoceratid ammonites with a subinvolute, mostly smooth, high whorled shell with convex or flat sides and frequent constrictions on the venter. It is included in the subfamily Puzosiinae and has bee ...

'' *''

Bifericeras ''Bifericeras'' is a Lower Jurassic ammonite belonging to the family Eoderoceratidae, and sometimes placed in the subfamily Xipherceratinae. Whorls are strongly depressed, but still evolute in coiling. The early growth state is prolonged, and sm ...

'' *''

Bigotites ''Bigotites'' is strongly ribbed, round-whorled perisphinctid ammonitic cephalopod from the middle Jurassic The Middle Jurassic is the second epoch of the Jurassic Period. It lasted from about 174.1 to 163.5 million years ago. Fossils of land ...

'' *''

Bihenduloceras ''Bihenduloceras'' is an Upper Jurassic perisphinctacean ammonite and member of the olcostephanid subfamily Spiticeratine. Its shell has a subquadrate whorl section, flattended venter, and fine ribs that spring in bundles from large umbilical tu ...

'' *''

Bilinguites ''Bilinguites'' is a genus belonging to the Gastrioceratoidea superfamily. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish, and more distantly to the nautiloid Naut ...

'' *''

Billcobbanoceras ''Billcobbanoceras'' is an extinct genus of cephalopod belonging to the Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, ...

'' *''

Biloclymenia ''Biloclymenia'' is a genus in the ammonoid order Clymeniida which is characterized by a dorsal retrosiphonitic siphuncle with long adapically pointing septal necks. The shell of shell ''Biloclymenia'' is thickly discoidal, more or less involute ...

'' *''

Biltnerites ''Biltnerites'' is a genus of ammonites (''s.l.'') from the lower Triassic included in the ceratitacean family Tirolitidae of the order Ceratitida, characterized by a flat, evolute shell with moderately compressed, rounded whorls. The spinose ...

'' *''

Binatisphinctes ''Binatisphinctes'' is an extinct genus of cephalopod belonging to the Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, a ...

'' *'' Binneyites'' *'' Biplices'' *''

Bisatoceras ''Bisatoceras'' is a late Paleozoic (Upper Mississippian - Upper Pennsylvanian) Ammonoidea, a member of the goniatitid family Bisatoceratidae. ''Bisatoceras'' was named by Miller and Owen in 1937 and has a subdiscoidal shell with a very narrow ...

'' *''

Blanfordiceras ''Blanfordiceras'' is a strongly ribbed, evolute ammonite included in the perisphinctacean family, Neocomitidae Neocomitidae is a family of Lower Cretaceous ammonitids comprising genera with strongly ribbed evolute (all whorls exposed) to sm ...

'' *''

Bochianites ''Bochianites'' is a straight shelled ammonite which lived from the Upper Jurassic, Tithonian, to the Lower Cretaceous, Hauterivian in what is now Europe, Greenland, Africa, North America and Asia.ARKADIEV, V. V.; ROGOV, M. A.; PERMINOV, V. A. ...

'' *'' Bodylevskites'' *'' Boehmoceras'' *'' Boesites'' *'' Bogdanoceras'' *'' Bollandites'' *'' Bollandoceras'' *'' Boreomeekoceras'' *'' Borissjakoceras'' *'' Borkinia'' *'' Bornhardticeras'' *'' Bosnites'' *'' Bostrychoceras'' *'' Boucaulticeras'' *'' Bouleiceras'' *''

Bradfordia ''Bradfordia'' is a moderately involute to involute genus included in the ammonoid cephalopod family Oppeliidae, coiled so that the outer whorl encloses most, or much, of the previous, but with a small umbilicus exposing inner whorls. The shell i ...

'' *'' Brahmaites'' *'' Bramkampia'' *''

Brancoceras ''Brancoceras'' is a rather small, strongly ribbed, acanthoceratacean ammonite from the Albian stage of the Lower Cretaceous, the shell evolute with a subquadrate whorl section and rounded venter. The suture forms a finely squiggly line with wel ...

'' *''

Branneroceras ''Branneroceras'' is a goniatitid genus from the Late Carboniferous (Middle -Late Pennsylvanian). Their fossils have been found in Nunavut, Canada, and in Arkansas and Texas, USA. Taxonomy ''Branneroceras'' has been assigned to the Schistocerat ...

'' *'' Branneroceratoides'' *'' Brasilia'' *''

Bredyia ''Bredyia'' is a genus of ammonites from the lower part of the Middle Jurassic, found in Europe and North America. ''Bredyia'' is a member of the Hammatoceratidae, a family which comprises part of the Hildoceratoidea Hildoceratoidea, formerly ...

'' *'' Brevikites'' *'' Brewericeras'' *'' Brightia'' *'' Brodieia'' *''

Brotheotrachyceras ''Brotheotrachyceras'' is a genus of ammonite cephalopod belonging to the order Ceratitida. It was living during the Carnian age of the Late Triassic Epoch. Classification The family to which ''Brotheotrachyceras'' belongs, Trachyceratidae ...

'' — originally published as a subgenus of '' Trachyceras'' *'' Brouwerites'' *'' Buchiceras'' *'' Budaiceras'' *'' Buddhaites'' *'' Bukowskiites'' *'' Bullatimorphites'' *'' Bulogites'' *'' Bunburyiceras'' *'' Burckhardites'' *'' Burijites'' *'' Busnardoites''

C

Ca

*'' Cabrievoceras'' *'' Cadoceras'' *''

Cadomites ''Cadomites'' is an extinct ammonite genus from the superfamily Stephanoceratoidea that lived during the Middle Jurassic (upper Bajocian – lower Callovian). Description ''Cadomites'' is directly descended from '' Stephanoceras'', with a sim ...

'' *''

Cadomoceras ''Cadomoceras'' is an extinct cephalopod genus from the order Ammonitida that lived during the Bajocian Stage of the Middle Jurassic, approximately 178 to 175 million years ago. ''Cadamoceras'' has smooth inner whorls but the outer has course pli ...

'' *'' Caenisites'' *'' Caenocyclus'' *'' Caenolyroceras'' *'' Cainoceras'' *'' Calaiceras'' *'' Calanquites'' *'' Californiceras'' *'' Callihoplites'' *''

Calliphylloceras ''Calliphylloceras'' is an ammonite belonging to the Phylloceratidae. Species Species within this genus include: * ''Calliphylloceras alontinum'' (Gemmellaro, 1884) * ''Calliphylloceras bicicolae'' * ''Calliphylloceras capitanii'' * ''Calliphyllo ...

'' *'' Calliptychoceras'' *'' Callizoniceras'' *'' Caloceras'' *''

Calycoceras ''Calycoceras'' is an extinct genus of cephalopods belonging to the subclass Ammonoidea and family Acanthoceratidae that lived during the Cenomanian stage of the Late Cretaceous, 100-94 Mya. Their shells had ornate ribs. Species *''C. algerien ...

'' *''

Campylites ''Campylites'' is a genus within the oppeliida subfamily Ochetoceratinae, equivalent to ''Neoprionoceras'' Spath 1928, that lived during the Oxfordian state at the beginning of the Late Jurassic. ''Campylites'' differs from '' Ochetoceras'' in ...

'' *'' Canadoceras'' *'' Canavarella'' *'' Canavaria'' *'' Canavarites'' *''

Cancelloceras ''Cancelloceras'' is an extinct genus of ammonites in the family Gastrioceratidae. Species are from the Carboniferous. †''Cancelloceras elegans'' Ruzhentsev and Bogoslovskaya 1978 is from the Carboniferous of the Russian Federation, Nevada (U ...

'' *'' Cantabricanites'' *'' Cantabrigites'' *'' Cardiella'' *'' Cardioceras'' *'' Carinoceras'' *''

Carinoclymenia ''Carinoclymenia'' was a genus of ammonites that existed during the Devonian The Devonian ( ) is a geologic period and system of the Paleozoic era, spanning 60.3 million years from the end of the Silurian, million years ago (Mya), to ...

'' *'' Carinophylloceras'' *'' Carnites'' *'' Carstenia'' *'' Carthaginites'' *''

Catacoeloceras ''Catacoeloceras'' is a genus of ammonite that lived during Middle Toarcian stage of early Jurassic The Early Jurassic Epoch (geology), Epoch (in chronostratigraphy corresponding to the Lower Jurassic series (stratigraphy), Series) is the earl ...

'' *'' Catasigaloceras'' *'' Catulloceras'' *'' Caucasites'' *''

Caumontisphinctes ''Caumontisphinctes'' is an ammonoid genus from the ammonitid superfamily Perkinsonatoidea that lived during the Bajocian stage of the Middle Jurassic. ''Chaumontisphinctis'', named by Buckman, is like the genus ''Perisphinctis'' in being compr ...

'' *'' Cavilentia''

Ce

*'' Ceccaites'' *'' Celaeceras'' *'' Cenisella'' *''

Ceratites ''Ceratites'' is an extinct genus of ammonite cephalopods. These nektonic carnivores lived in marine habitats in what is now Europe, during the Triassic, from the upper-most Anisian to the lower Ladinian The Ladinian is a stage and age in th ...

'' *'' Ceratpbeloceras'' *'' Chamoussetia''

Ch

*'' Chanasia'' *'' Changhsingoceras'' *'' Chartronia'' *''

Cheiloceras ''Cheiloceras'' is a subglobular to thickly lenticular goniatite with a closed umbilicus from the Upper Devonian and type genus for the Cheiloceratidae. ''Cheiloceras'' is sometimes split into at least three subgenera. ''Cheiloceras (Cheilocer ...

'' *'' Cheloniceras'' *''

Cheltonia ''Cheltonia'' is an extinct genus of ammonite from the Upper Sinemurian substage of Lower Jurassic of Europe, Africa,

'' *'' Chesapeakiceras'' *'' Chetaites'' *'' Chieseiceras'' *'' Chioceras'' *'' Chiotites'' *'' Choffatia'' *'' Choffaticeras'' *''

Chondroceras ''Chondroceras'' is an extinct genus from a well-known class of fossil cephalopods, the ammonites. It lived during the Jurassic Period The Jurassic ( ) is a geologic period and stratigraphic system that spanned from the end of the Triassic Peri ...

'' *'' Choristoceras'' *'' Christioceras'' *'' Christophoceras'' *'' Chumazites''

Ci

*''

Cibolaites The genus ''Cibolaites'' is a strongly ribbed and nodose ammonoid cephalopod from the middle Cretaceous of western New Mexico, included in the taxonomic family Collignoniceratidae. A single species ''Cibolaites molenaari'' is known. Description ...

'' *'' Cibolites'' *'' Cicatrites'' *''

Cirroceras ''Didymoceras'' is an extinct genus of ammonite cephalopod from the Late Cretaceous epoch (approximately 76 Ma). It is one of the most bizarrely shaped genera, with a shell that spirals upwards into a loose, hooked tip. It is thought to have drif ...

Cl

*''

Cladiscites ''Cladiscites'' is an extinct genus of cephalopods in the ammonoid order Ceratitida. These nektonic carnivores lived during the Triassic, from Carnian to Rhaetian age. Description Shells of these cephalopods can reach a diameter of about . This ...

'' *'' Clambites'' *''

Cleistosphinctes ''Cleistosphinctes'' is an extinct cephalopod genus from the ammonite order that lived during the Middle Jurassic. ''Cleistosphinctes'', named by Arkell, 1953, and included in the family Perisphinctidae and superfamily Perisphinctaceae, is small ...

'' *'' Cleoniceras'' *''

Cleviceras ''Cleviceras'' is an extinct genus of cephalopod belonging to the family Hildoceratidae. These cephalopods existed in the Jurassic period, during Toarcian and possibly even uppermost Pliensbachian age.M. K. Howarth 2013. Treatise on Invertebrate ...

'' *'' Clinolobus'' *'' Clionitites'' *''

Clioscaphites ''Clioscaphites'' is an extinct genus of ammonite belonging to the family Scaphitidae. Species in this genus are important index fossils of the Western Interior Seaway of the Coniacian to Santonian Ages of the Cretaceous The Cretaceous ( ) is ...

'' *'' Clistoceras'' *'' Cloioceras'' *'' Cluthoceras'' *'' Clydomphalites'' *'' Clydoniceras'' *'' Clydonites'' *'' Clymenia'' *'' Clymenoceras'' *''

Clypeoceras ''Clypeoceras'' is a genus of ammonites with an involute discoidal shell from the Lower Triassic. Description The shell of ''Clypeoceras'' is laterally compressed, involute, discoidal; whorls strongly embracing and deeply indented by the next i ...

Co

*'' Coahuilites'' *''

Cobbanites ''Cobbanites'' is a genus of extinct ammonoid cephalopods from the Family Perisphinctidae. Species of the genus date from the Jurassic (Bathonian to Early Callovian) period and have been found in the US (Alaska and Montana Montana () is ...

'' *'' Cobbanoscaphites'' *'' Cochleiferoceras'' *'' Cochloceras'' *'' Cochlocrioceras'' *'' Coeloceltites'' *'' Coeloceras'' *'' Coeloderoceras'' *''

Coilopoceras ''Coilopoceras'' is a compressed, involute, lenticular ammonitid from the Cretaceous (Albian to Turonian),Colchidites'' *'' Collectoceras'' *'' Collignoniceras'' *'' Collignonites'' *'' Collina'' *'' Collotia'' *'' Colombiceras'' *'' Coloradoscaphites'' *'' Columbites'' *'' Concavites'' *''

Conlinoceras ''Conlinoceras'', once included with ''Calycoceras'' as the subgenus ''Calycoceras (Conlinocras)'', is a strongly ribbed, evolute ammonite, belonging to the acanthoceratid subfamily Acanthoceratinae, known from the Cenomanian The Cenomanian is, ...

'' *'' Constileioceras'' *'' Convoluticeras'' *'' Cordubiceras'' *'' Coroceras'' *'' Corongoceras'' *''

Coroniceras ''Coroniceras'' is a genus in the Arietitidae, a family in the ammonitid superfamily Psiloceratoidea, from the lower Sinermurian stage in the Lower Jurassic. It is a sub zone ammonite of the '' Arnioceras semicostatum'' Zone. ''Coroniceras'' ha ...

'' *'' Coronites'' *'' Costaclymenia'' *'' Costidiscus'' *''

Costigymnites ''Costigymnites'' is an extinct genus of cephalopods belonging to the Ammonite subclass that lived in lower Anisian (Bithynian, Ismidicus zone) in what is now Iran Iran, officially the Islamic Republic of Iran, and also called P ...

'' *'' Costileioceras'' *'' Costimitoceras'' *'' Cottreauites'' *'' Couloniceras'' *'' Cowtoniceras''

Cr

*''

Cranocephalites ''Cranocephalites'' is a Middle Jurassic ammonitid genus named by Spath in 1932 and included in the family Cranoceratidae, superfamily Stephanoceratacea. ''Cranocephalites'', sometimes considered a subgenus of ''Arctocephalites'' which has sha ...

'' *''

Craspedites ''Craspedites'' is an ammonoid cephalopod included in the Perisphinctoidea that lived during the Late Jurassic and Early Cretaceous, found in Canada, Greenland, Poland, and the Russian Federation. Diagnosis and range ''Craspedites'', described ...

'' *'' Craspedodiscus'' *'' Crassiceras'' *'' Crassiplanulites'' *''

Crassotornoceras ''Crassotornoceras'' is genus of ammonoids that lived during Upper Devonian period, from the base of Frasnian The Frasnian is one of two faunal stages in the Late Devonian Period. It lasted from million years ago to million years ago. It was ...

'' *'' Cravenites'' *'' Cravenoceras'' *'' Cravenoceratoides'' *''

Creniceras ''Creniceras'' is a rather small Upper Jurassic ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely relate ...

'' *'' Crickites'' *'' Crimites'' *'' Crioceras'' *'' Crioceratites'' *'' Cruasiceras'' *''

Crucilobiceras ''Crucilobiceras'' is an ammonoid cephalopod genus from the Lower Jurassic belonging to the eoderoceratoidean family Eoderoceratidae. ''Cruciliboceras'' has an evolute shell, such that all whorls are well exposed, with persistent radial ribbing ...

'' *'' Crussoliceras'' *'' Cryptoclymenia'' *'' Cryptotexanites''

Ct

*''

Ctenobactrites ''Ctenobactrites'' is an extinct genus of cephalopods that lived from the Carboniferous to the Permian. It contains seven valid species which have been found in Europe, Asia, and North America. It was originally assigned to the order Bactritida ...

'' *'' Cteroclymenia''

Cu

*'' Cubaochetoceras'' *'' Cuccoceras'' *'' Cuneicardioceras'' *'' Cunitoceras'' *''

Cunningtoniceras ''Cunningtoniceras'' is a stocky acanthoceratid ammonite from the upper Cenomanian stage of the late Cretaceous of the western U.S., found e.g. in Arizona and New Mexico. ''Cunningtoniceras'' was proposed by Maurice Collignon, 1927, for ribbed ...

'' *'' Cutchisphinctes'' *'' Cuyaniceras''

Cy

*'' Cyclobactrites'' *'' Cycloceltites'' *''

Cyclolobus ''Clyclolobus'' is a smooth, essentially involute subdiscoidal goniatitid ammonoid that has sutures with a bifurcate ventral lobe, flared outwardly at the end, in which the halves may be secondarily trifurcated, ending in sharp, narrow projection ...

'' *'' Cycloclymenia'' *'' Cylioceras'' *''

Cymaceras ''Cymaceras'' is a genus within the oppeliid subfamily Ochetoceratinae from the Kimmeridgian stage, around the middle of the Upper Jurassic. ''Cymaceras'' is rather unusual in its wavy keel that leans alternatingly to one side then the other. Sh ...

'' *'' Cymaclymenia'' *'' Cymahoplites'' *'' Cymbites'' *'' Cymoceras'' *'' Cyrtobactrites'' *'' Cyrtochilus'' *'' Cyrtoclymenia'' *'' Cyrtopleurites'' *'' Cyrtosiceras''

Cz

*'' Czekanowskites''

D

Da

*''

Dactylioceras ''Dactylioceras'' was a widespread genus of ammonites from the Lower Jurassic period, approximately 180 million years ago (mya). Etymology The name ''Dactylioceras'' comes from the Greek ''dactyl'', meaning “finger”, and refers to the shell ...

'' *''

Dagnoceras ''Dagnoceras'' is a ceratitid ammonite from the Lower Triassic that has a basically evolutute, discoidal shell with an arched venter and ceratitic sutures. The Treatise 1957 includes it in the Meekoceratidae The Meekoceratidae is a family of cer ...

'' *'' Daixites'' *'' Dalmasiceras'' *'' Dalmatites'' *''

Damaisiceras ''Damaisiceras'' is an extinct monospecific ancylocerid genus included in the family Crioceratitidae, subclass Ammonoidea Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. Thes ...

'' *'' Damesiceras'' *'' Damesites'' *'' Danubisphinctes'' *'' Danubites'' *'' Daphnites'' *'' Daraelites'' *''

Darellia ''Hyperlioceras'' is an extinct genus of cephalopod included in the ammonitid family Graphoceratidae that lived during the Bajocian stage of the Middle Jurassic. The type species is ''Hyperlioceras discites'' (Waagen, 18567) Morphology The shel ...

'' *''

Darvasiceras ''Darvasiceras'' was a prolecanitid ammonoid cephalopod from the Early or Lower Permian Chelamchin Formation of Tajikistan. The genus is included in what is now the superfamily Medlicottioidea The Medlicottioidea is one of two superfamilies ...

'' *''

Dasyceras ''Dasyceras'' is an early phylloceratid from the Sinemurian In the geologic timescale, the Sinemurian is an age and stage in the Early or Lower Jurassic Epoch or Series. It spans the time between 199.3 ± 2 Ma and 190.8 ± 1.5 Ma (million ...

'' *''

Daxatina ''Daxatina'' is a fossil ammonoid cephalopod included in the trachyceratid family of the order Ceratitida Ceratitida is an order that contains almost all ammonoid cephalopod genera from the Triassic as well as ancestral forms from the Upper ...

'' *''

Dayiceras ''Dayiceras'' is a finely ribbed polymorphitid eoderoceratacean ammonoid Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are mo ...

De

*'' Decipia'' *'' Decorites'' *'' Deiradoceras'' *'' Delecticeras'' *'' Delepinoceras'' *'' Delphinites'' *'' Demarezites'' *'' Derolytoceras'' *'' Deshayesites'' *'' Desmoceras'' *'' Desmophyllites'' *'' Desmoscaphites'' *'' Devonobactrites'' *'' Devonopronorites''

Dh

*'' Dhosaites'' *'' Dhrumaites''

Di

*'' Diaboloceras'' *'' Diadochoceras'' *'' Diamanticeras'' *'' Diaplococeras'' *'' Diaziceras''

Di (Cont.)

*'' Dichotomites'' *'' Dichotomoceras'' *'' Dichotomosphinctes'' *'' Dickersonia'' *'' Dicostella'' *'' Didymites'' *''

Didymoceras ''Didymoceras'' is an extinct genus of ammonite cephalopod from the Late Cretaceous epoch (approximately 76 Ma). It is one of the most bizarrely shaped genera, with a shell that spirals upwards into a loose, hooked tip. It is thought to have drif ...

'' *''

Dieneria ''Dieneria'' is a genus of ceratitid ammonoid cephalopods from the Late Triassic of western North America with a smooth discoidal shall of which the venter is truncate and the suture simple. Only the first lateral lobe is slightly serrated, the ...

'' *'' Difuntites'' *'' Digitophyllites'' *'' Dilatobactrites'' *'' Dimeroceras'' *''

Dimeroclymenia ''Dimeroclymenia'' was an extinct genus of ammonites that existed during the Devonian The Devonian ( ) is a geologic period and system of the Paleozoic era, spanning 60.3 million years from the end of the Silurian, million years ago ...

'' *''

Dimorphinites ''Dimorphinites'' is an extinct genus from a well-known class of fossil cephalopods, the ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred ...

'' *'' Dimorphites'' *'' Dimorphoceras'' *'' Dimorphoceratoides'' *'' Dimorphoplites'' *'' Dimorphotoceras'' *'' Dinarites'' *'' Diodochoceras'' *'' Dionites'' *'' Diplacmoceras'' *'' Diplasioceras'' *''

Diplesioceras ''Diplesioceras'' is an extinct genus from a well-known class of fossil cephalopods, the ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred ...

'' *'' Diplomoceras'' *'' Diplosirenites'' *''

Dipoloceras ''Dipoloceras'' is a rather evolute, strongly ribbed and well keeled acanthocerataean ammonite from the Albian stage of the Lower Cretaceous included in the brancoceratid subfamily Mojsisovicziinae. The whorl section is typically inflated or ...

'' *'' Dipoloceroides'' *'' Dirrymoceras'' *'' Discoceratites'' *'' Discoclymenia'' *'' Discohoplites'' *'' Discophiceras'' *'' Discophyllites'' *'' Discoptychites'' *''

Discoscaphites ''Discoscaphites '' is an extinct genus of ammonite. This genus may have been one of the few to have briefly survived the K-Pg mass extinction. Distributions Cretaceous of Greenland, Alabama, Arkansas, California, Colorado, Kansas, Maryland, M ...

'' *'' Discosphinctes'' *'' Discosphinctoides'' *'' Discotropites'' *'' Distichites'' *''

Distichoceras ''Distichoceras'' is a member of the Haploceratacean family, Oppeliidae, and type genus for the subfamily Distichoceratinae, found in upper Middle and lower Upper Jurassic The Late Jurassic is the third epoch of the Jurassic Period, and it s ...

'' *'' Distoloceras''

Di (cont. 2)

*'' Dittmarites'' *'' Divisosphinctes''

Dj

*'' Djurjuriceras''

Do

*'' Dobrodgeiceras'' *''

Dobrogeites ''Dobrogeites'' is a genus of ammonoids from the order Ceratitida, included in the family Megaphyllitidae that produced evolute compressed planispiral shells with rounded venters, inner whorls ornamented as in Tirolites, outer whorls smooth, sutu ...

'' *''

Docidoceras ''Docidoceras'' is an extinct ammonite genus from the order Ammonitida that lived during the Middle Jurassic. ''Docidoceras'' is included in the family Otoitidae which makes up part of the ammonite superfamily Stephanoceratoidea. ''Docidoceras'' ...

'' *'' Dolikephalites'' *''

Domanikoceras ''Domanikoceras'' is monospecific genus of ammonoids that lived during the lower Frasnian stage of upper Devonian period and was named after Domanic Suite in the Timan (Russia). Compressed and smooth shell of these ammonoids had closed umbilicus. ...

'' *''

Dombarigloria ''Dombarigloria'' is a genus belonging to the goniatitid family Cravenoceratidae; extinct ammonoids which are shelled cephalopods more closely related to squid, octopus and other coleoids than to the superficially similar '' Nautilus'' ''Domba ...

'' *'' Dombarites'' *'' Dombarocanites'' *''

Donetzoceras ''Donetzoceras'' is a genus belonging to the goniatitid family Gonioglyphioceratidae ; extinct ammonoids which are shelled cephalopods more closely related to squid, octopus and other coleoids than to the superficially similar '' Nautilus'' ' ...

'' *'' Dorikranites'' *'' Dorsetensia'' *'' Dorsoplanites'' *'' Doryceras'' *'' Doubichites'' *'' Doulingoceras'' *'' Douvilleiceras''

Dr

*'' Drepanites'' *'' Drumoceras''

Du

*''

Duashnoceras ''Duashnoceras'' is an extinct ammonoid cephalopod genus included in the Stephanoceratidae that lived during the Bathonian stage of the Middle Jurassic. ''Duashnoceras'' was established by Westermann in 1983, based on ''Stephanoceras floresi'' Bu ...

'' *''

Dufrenoya ''Dufrenoyia'' is an extinct genus of Cretaceous ammonites included in the family Parahoplitidae. These fast-moving nektonic carnivores lived in the Cretaceous period ( Aptian age).Sepkoski, JacSepkoski's Online Genus Database – Cephalopoda/re ...

'' *''

Dumortieria ''Dumortieria'' is a genus of ammonites belonging to the family Graphoceratidae. Fossil record These cephalopods were fast-moving nektonic carnivores. They lived in the Late Jurassic, upper Toarcian age (from about 180.1 to 175.6 million ...

'' *'' Dunbarites'' *'' Dunedinites'' *'' Dunveganoceras'' *'' Durangites'' *''

Durotrigensia ''Durotrigensia'' is a genus of ammonites ( Ammonitida) in the perisphinctoid family Parkinsoniidae. ''Durotrigensia'' is sometimes considered a subgenus of '' Parkinsonia'' and is related also to '' Oraniceras'' and ''Okribites''. These ceph ...

'' *'' Durvilleoceras''

Dy

*'' Dyscheiloceras''

Dz

*'' Dzhaprakoceras'' *'' Dzhulfoceras''

E

*'' Eboraciceras'' *'' Eboroceras'' *'' Ebrayiceras'' *'' Echioceratoides'' *'' Echioceras'' *'' Ectocentrites'' *'' Ectolcites'' *''

Edmundites The Society of Saint Edmund ( la, Societas Patrum S. Edmundi) also known as the Edmundites, is a clerical religious congregation of Pontifical Right for men in the Catholic Church founded in 1843, in Pontigny, France, by Jean Baptiste Muard. The c ...

'' *'' Egrabensiceras'' *'' Eleganticeras'' *''

Elephantoceras ''Elephantoceras'' is genus of a Middle Permian ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely relate ...

'' *'' Ellipsoceras'' *'' Elobiceras'' *'' Emaciaticeras'' *''

Emileia ''Emileia'' is an extinct genus from a well-known class of fossil cephalopods, the ammonites, that lived during the early part of the Bajocian. ''Emileia''is a large form with fine ribbing that includes may secondaries. It begins as a barrel sh ...

'' *'' Emilites'' *''

Emperoceras ''Didymoceras'' is an extinct genus of ammonite cephalopod from the Late Cretaceous epoch (approximately 76 Ma). It is one of the most bizarrely shaped genera, with a shell that spirals upwards into a loose, hooked tip. It is thought to have dr ...

'' *'' Enayites'' *'' Engonoceras'' *'' Enosphinctes'' *'' Entogonites'' *'' Eoacrochordiceras'' *'' Eoaraxoceras'' *'' Eoasianites'' *'' Eobeloceras'' *'' Eocanites'' *''

Eocephalites ''Eocephalites'' is an extinct genus from a well-known class of fossil cephalopods, the ammonites. It lived during the Bajocian In the geologic timescale, the Bajocian is an age and stage in the Middle Jurassic. It lasted from approximately 170 ...

'' *'' Eochetoceras'' *'' Eocrioceratites'' *'' Eodanubites'' *''

Eoderoceras ''Eoderoceras'' is an evolute, round whorled ammonite from the Lower Jurassic with an outer row of distinct spines, and in some, an inner row of tubercles, on either side; ribs only on the inner whorls. ''Eoderoceras'', named by Leonard Spath i ...

'' *'' Eodesmoceras'' *'' Eodouvilleiceras'' *''

Eogaudryceras ''Eotetragonites'' is an extinct genus of ammonite.Sepkoski, Jac Sepkoski's Online Genus Database/ref> ''Eotetragonites'' is considered by some authors a subgenus of '' Eogaudryceras''. Species Species within this genus include: *''Eotetragonite ...

'' *'' Eogonioloboceras'' *'' Eogunnarites'' *'' Eogymnites'' *'' Eohecticoceras'' *'' Eoheteroceras'' *'' Eohyattoceras'' *'' Eomadrasites'' *'' Eonomismoceras'' *'' Eopachydiscus'' *'' Eoparalegoceras'' *'' Eophyllites'' *'' Eoprodromites'' *'' Eoprotrachyceras'' *'' Eopsiloceras'' *'' Eosagenites'' *'' Eoscaphites'' *'' Eoschistoceras'' *'' Eosturia'' *''

Eotetragonites ''Eotetragonites'' is an extinct genus of ammonite.Sepkoski, Jac Sepkoski's Online Genus Database/ref> ''Eotetragonites'' is considered by some authors a subgenus of ''Eogaudryceras''. Species Species within this genus include: *''Eotetragonites ...

'' *'' Eothalassoceras'' *'' Eothinites'' *'' Eotissotia'' *''

Eowellerites ''Eowellerites'' is genus of ammonoid cephalopods belonging to the Welleritidae family. Species belonging to this genus lived in middle Pennsylvanian (Moscovian Moscovian may refer to: *An inhabitant of Moscow, the capital of Russia *Somethi ...

'' *'' Epacrochordiceras'' *''

Epadrianites Epadrianites is a genus of the Adrianitidae family. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish Cuttlefish or cuttles are marine molluscs of the order Sepii ...

'' *'' Epancyloceras'' *'' Eparietites'' *'' Epaspidoceras'' *'' Epicanites'' *'' Epiceltites'' *'' Epiceltitoides'' *''

Epicephalites ''Epicephalites'' is a perisphictid ammonite, included in the subfamily Aulacostephaninae, from the Upper Jurassic of New Zealand and Mexico, related to '' Involuticeras''. Its shell is involute, whorls inflated with a deep umbilicus. The outer h ...

'' *'' Epiceratites'' *'' Epicheloniceras'' *'' Epicosmoceras'' *'' Epideroceras'' *'' Epiglyphioceras'' *'' Epiglyptoxoceras'' *'' Epigonites'' *'' Epigymnites'' *'' Epihoplites'' *'' Epijuresanites'' *'' Epileymeriella'' *'' Epimayaites'' *'' Epimorphoceras'' *'' Epipallasiceras'' *'' Epipeltoceras'' *'' Episageceras'' *'' Episculites'' *''

Epistrenoceras ''Epistrenoceras'' is an extinct genus from a well-known class of fossil cephalopods, the ammonites. It lived during the Bajocian to the Bathonian. Distribution Only found only at Winnberg quarry, Sengenthal Sengenthal is a municipality in th ...

'' *'' Epitauroceras'' *'' Epithalassoceras'' *'' Epitornoceras'' *'' Epivirgatites'' *'' Epiwocklumeria'' *'' Epophioceras'' *'' Erbenoceras'' *''

Eremites A hermit, also known as an eremite (adjectival form: hermitic or eremitic) or solitary, is a person who lives in seclusion. Eremitism plays a role in a variety of religions. Description In Christianity, the term was originally applied to a Chr ...

'' *'' Erinoceras'' *'' Erioliceras'' *'' Eristavites'' *''

Ermoceras ''Ermoceras'' is a genus of ammonite belonging to the Thomboceratidae family of the Middle Jurassic ( u Baj) found in deposites of central Arabia, Sinai, and Algeria with strong primary and secondary ribs and a single row of lateral tubercles ...

'' *'' Erycites'' *'' Erymnoceras'' *'' Erymnocerites'' *'' Esericeras'' *''

Euagassiceras ''Euagassiceras'' is an extinct genus of cephalopod belonging to the Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, ar ...

'' *''

Euaptetoceras ''Euaptetoceras'' is an evolute hildoceratoid ammonite from the lower Middle Jurassic, included in the family Hammatoceratidae and the subfamility Hammatoceratinae. The genus may be a junior synonym for '' Eudmetoceras'' of Buckman, 1920. The ...

'' *'' Euaspidoceras'' *''

Eubaculites ''Eubaculites'' is an extinct genus of cephalopods in the family Baculitidae and each known species was initially placed within the related genus '' Baculites'' until it was placed in a separate genus in 1926. ''Eubaculites'' existed from the Tu ...

'' *'' Eubostrychoceras'' *'' Eubranoceras'' *''

Eucalycoceras ''Eucalycoceras'' is an extinct genus of cephalopods belonging to the Ammonite subclass. Species *''E. collignoni'' Fabre, 1940 *''E. denizoti'' Fabre, 1940 *''E. gothicum'' Kossmat, 1895 *''E. pentagonus'' Jukes-Browne, 1896 Description ''Euc ...

'' *'' Eucoroniceras'' *'' Eucycloceras'' *'' Eudiscoceras'' *''

Eudmetoceras ''Eudmetoceras'' is an extinct genus from a well-known class of fossil cephalopods, the ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred ...

'' *'' Euflemingites'' *'' Euhoplites'' *'' Euhoploceras'' *'' Euhystrichoceras'' *'' Euisculites'' *'' Eulophoceras'' *'' Eulytoceras'' *'' Eumedlicottia'' *'' Eumorphoceras'' *''

Euomphaloceras ''Euomphaloceras'' is an early Upper Cretaceous ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely rela ...

'' *'' Eupachydiscus'' *'' Euphylloceras'' *'' Eupinacoceras'' *'' Eupleuroceras'' *'' Euprionoceras'' *'' Euptychoceras'' *'' Eurites'' *'' Euroceras'' *'' Eurycephalites'' *'' Eurynoticeras'' *'' Eusagenites'' *'' Eutomoceras'' *'' Euturrilites'' *''

Exiteloceras ''Exiteloceras'' is an ammonite genus from the Late Cretaceous. ''Exiteloceras'' was proposed by Alpheus Hyatt in 1894 for heteromorph ammonites with shells that are loosely coiled in a plane, early whorls varying from straight limbs connected b ...

'' *'' Exotornoceras'' *'' Ezilloella''

F

*''

Fagesia ''Fagesia'' is a small, subglobular ammonite (suborder Ammonitina) belonging to the vascoceratid family of the Acanthocerataceae that lived during the Turonian stage of the Late Cretaceous, 92-88 Ma ago. The shell of ''Fagesia'' is about 9.5 ...

'' *'' Falciclymenia'' *'' Falciferella'' *''

Falcitornoceras ''Falcitornoceras'' is a goniatitid ammonite from the Late Devonian, early Famennian The Famennian is the latter of two faunal stages in the Late Devonian Epoch. The most recent estimate for its duration estimates that it lasted from around 3 ...

'' *'' Fallacites'' *'' Falloticeras'' *'' Fanninoceras'' *'' Farbesiceras'' *'' Farnhamia'' *'' Fascipericyclus'' *'' Favrella'' *'' Fayettevillea'' *'' Fehlmannites'' *'' Ferganoceras'' *'' Ficheuria'' *'' Fikaites'' *'' Finiclymenia'' *''

Fissilobiceras ''Fissilobiceras'' ist ein glatter, komprimierter, involuter Ammonit aus dem unteren mittleren Jura (Aalenium/Bajocium) Europas, der 1919 von Buckman benannt wurde. ''Fissilobiceras'' gehört zur Familie der Hildoceratoiden (Hammatoceratidae ...

'' *''

Flabellisphinctes ''Flabellisphinctes'' is small, evolute ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to li ...

'' *''

Flemingites ''Flemingites'' is a genus of evolute ammonoids from the Lower Triassic with spiral ridges on the shell. Diagnosis The shell of ''Flemingites'' is evolute so that all whorls show externally. Whorls are robust, slightly embracing, usually a lit ...

'' *'' Flexiclymenia'' *'' Flexispinites'' *'' Flexoptychites'' *''Flickia'' *''Fontanelliceras'' *''Fontannesia'' *''Fontannesiella'' *''Foordites'' *''Forbesiceras'' *''Forresteria'' *''Fournierella (cephalopod), Fournierella'' *''Frankites'' *''Frechiella'' *''Frechites'' *''Frenguelliceras'' *''Fresvillia'' *''Frogdenites'' *''Fuciniceras'' *''Funiferites''

G

*''Gabbioceras'' *''Gabillytes'' *''Gaetanoceras'' *''Gagaticeras'' *''Gaitherites'' *''Galaticeras'' *''Galbanites'' *''Gangadharites'' *''Garantiana'' *''Gargasiceras'' *''Garniericeras'' *''Garnierisphinctes'' *''Garroniceras'' *''Gastrioceras'' *''Gastroplites'' *''Gattendorfia'' *''Gattenpleura'' *''Gaudryceras'' *''Gaurites'' *''Gauthiericeras'' *''Gazdaganites'' *''Gemmellaroceras'' *''Gentoniceras'' *''Genuclymenia'' *''Georgioceras'' *''Germariceras'' *''Gevanites'' *''Geyeroceras'' *''Giovaraites'' *''Girtyoceras'' *''Glabrophysodoceras'' *''Glamocites'' *''Glaphyrites'' *''Glassoceras'' *''Glatziella'' *''Glaucolithites'' *''Gleboceras'' *''Gleviceras'' *''Glochiceras'' *''Glottoptychinites'' *''Glyphidites'' *''Glyphiolobus'' *''Glyptarpites'' *''Glyptoceras'' *''Glyptoxoceras'' *''Gnomohalorites'' *''Gogoceras'' *''Goliathiceras'' *''Goliathites'' *''Goniatites'' *''Gonioclymenia'' *''Goniocyclus'' *''Gonioglyphioceras'' *''Gonioloboceras'' *''Gonioloboceratoides'' *''Gonionotites'' *''Gonolkites'' *''Goodhallites'' *''Gracilisphinctes'' *''Gracilites'' *''Grambergia'' *''Grammoceras'' *''Grandidiericeras'' *''Graphoceras'' *''Gravesia (ammonite), Gravesia'' *''Grayiceras'' *''Graysonites'' *''Gregoryceras'' *''Griesbachites'' *''Groebericeras'' *''Groenlandites'' *''Grossouvria'' *''Grossouvrites'' *''Guembelites'' *''Guhsania'' *''Guleilmites'' *''Guleimiceras'' *''Gulielmina'' *''Gulielmites'' *''Gunnarites'' *''Gyaloceras'' *''Gymnites'' *''Gymnodiscoceras'' *''Gymnoplites'' *''Gymnotoceras'' *''Gymnotropites'' *''Gyroceratites'' *''Gyroclymenia'' *''Gyronites''

H

Ha

*''Haidingerites'' *''Halilucites'' *''Halorites'' *''Hamites (genus), Hamites'' *''Hamiticeras'' *''Hamitoides'' *''Hammatoceras'' *''Hammatocyclus'' *''Hamulina'' *''Hamulinites'' *''Hanielites'' *''Hannaoceras'' *''Hantkeniceras'' *''Haploceras'' *''Haplophylloceras'' *''Haplopleuroceras'' *''Haploscaphites'' *''Haresiceras'' *''Harpoceras'' *''Harpoceratoides'' *''Harpohildoceras'' *''Harpophylloceras'' *''Hatchericeras'' *''Hauericeras'' *''Hauerites'' *''Haugia''

He

*''Hebetoxyites'' *''Hecticoceras'' *''Hectioceras'' *''Hecticoceras, Hectioceratoides'' *''Hectoroceras'' *''Hedenstroemia'' *''Heinzia'' *''Helicancylus'' *''Helicocyclus'' *''Helictites (ammonite), Helictites'' *''Hemiaspenites'' *''Hemibaculites'' *''Hemigarantia'' *''Hemihaploceras'' *''Hemihoplites''

He (Cont.)

*''Hemilecanites'' *''Hemilytoceras'' *''Hemiptychoceras'' *''Hemisimoceras'' *''Hemitetragonites'' *''Hemitissotia'' *''Hengestites'' *''Heraclites (ammonite), Heraclites'' *''Herrickiceras'' *''Hertleinites'' *''Herznachites'' *''Heteroceras'' *''Heterotissotia'' *''Hexaclymenia''

Hi

*''Hibernicoceras'' *''Hildaites'' *''Hildoceras'' *''Hildoceratoides'' *''Hildoglochiceras'' *''Himalayites'' *''Himantoceras'' *''Himavatites'' *''Himispiticeras''

Hl

*''Hlawiceras''

Ho

*''Hodsonites'' *''Hoeninghausia'' *''Hoepenites'' *''Palermoceras, Hoffmannia'' *''Holcodiscoides'' *''Holcodiscus'' *''Holcolissoceras'' *''Holcophylloceras'' *''Holcolytoceras'' *''Holcoptychites'' *''Hollandites'' *''Holzapfeloceras'' *''Holzbergia''

Ho (Cont.)

*''Homerites'' *''Homoceras'' *''Homoceratoides'' *''Homoeoplanulites'' *''Hoplikosmokas'' *''Hoplites (ammonite), Hoplites'' *''Hoplitoides'' *''Hoplitoplacenticeras'' *''Hoplocardioceras'' *''Hoplocrioceras'' *''Hoploscaphites'' *''Hoplotropites'' *''Horioceras'' *''Hourcquia''

Hu

*''Hubertoceras'' *''Hudlestonia'' *''Hudsonoceras'' *''Huishuites'' *''Hulenites'' *''Hunanites'' *''Hungarites''

Hy

*''Hyattites'' *''Hyattoceras'' *''Hybonoticeras'' *''Hypacanthoplites'' *''Hyparpadites'' *''Hypengonoceras'' *''Hyperderoceras'' *''Hypergoniatites'' *''Hyperlioceras'' *''Hyphantoceras'' *''Hyphoplites'' *''Hypisculites'' *''Hypocladiscites'' *''Hypophylloceras'' *''Hypoturrilites'' *''Hypoxynoticeras'' *''Hyrcanites'' *''Hysteroceras''

I

*''Iberites'' *''Idanoceras'' *''Idiocycloceras'' *''Idiohamites'' *''Idoceras'' *''Ilowaiskya'' *''Imitoceras'' *''Imlayiceras'' *''Inaigymnites'' *''Indigirites'' *''Indigirophyllites'' *''Indoceltites'' *''Indocephalites'' *''Indoceras'' *''Indojuvavites'' *''Indonesites'' *''Indoscaphites'' *''Indosphinctes'' *''Iniskinites'' *''Intoceras'' *''Intornites'' *''Intranodites'' *''Involuticeras'' *''Inyoites'' *''Inzeroceras'' *''Iranoceras'' *''Irinoceras'' *''Isculites'' *''Isculitoides'' *''Ismidites'' *''Isohomoceras'' *''Isohoplites'' *''Isterites'' *''Istreites'' *''Ivoites''

J

*''Jacobites (genus), Jacobites'' *''Janenschites'' *''Japonites'' *''Jauberticeras'' *''Jeanneticeras'' *''Jeanvogericeras'' *''Jeletzkytes'' *''Jellinekites'' *''Jimboiceras'' *''Jimenites'' *''Joannites (genus), Joannites'' *''Jouaniceras'' *''Jovites'' *''Juddiceras'' *''Judicarites'' *''Juraphyllites'' *''Juresanites'' *''Juvavites'' *''Juvenites''

K

*''Kabylites'' *''Kachpurites'' *''Kalloclymenia'' *''Kamerunoceras'' *''Kammerkaroceras'' *''Kamptoclymenia'' *''Kamptokephalites'' *''Karaclymenia'' *''Karagandoceras'' *''Karamaiceras'' *''Karamaites'' *''Karangatites'' *''Karapadites'' *''Karaschiceras'' *''Kardailites'' *''Karlwaageites'' *''Karsteniceras'' *''Kashmirites'' *''Katacanites'' *''Katroliceras'' *''Katrolites'' *''Kayutoceras'' *''Kazakhoceras'' *''Kazakhoclymenia'' *''Kazakhstania (ammonite), Kazakhstania'' *''Kazakhstanites'' *''Kazanskyella'' *''Kellawaysites'' *''Kellnerites'' *''Kelteroceras'' *''Kenseyoceras'' *''Kepplerites'' *''Keppleritiana'' *''Kerberites'' *''Keyserlingites'' *''Kheraiceras'' *''Hecticoceras, Kheraites'' *''Khvalynites'' *''Kiaclymenia'' *''Kielcensia'' *''Kilianella'' *''Kimoceras'' *''Kingites'' *''Kingoceras'' *''Kinkeliniceras'' *''Kiparisovia'' *''Kiparisovites'' *''Kirsoceras'' *''Kitchinites'' *''Klamathites'' *''Klematosphinctes'' *''Klipsteinia'' *''Knemiceras'' *''Koenenites'' *''Kohaticeras'' *''Koloceras'' *''Komioceras'' *''Koninckites'' *''Korythoceras'' *''Kosmermoceras'' *''Kosmoceras'' *''Kosmoclymenia'' *''Kossmatella'' *''Kossmatia'' *''Kossmaticeras'' *''Kourazoceras'' *''Kozhimites'' *''Krafftoceras'' *''Kranaosphinctes'' *''Krumbeckia'' *''Kufengoceras'' *''Kumatostephanus'' *''Kurnubiella'' *''Kushanites'' *''Kutatissites''

L

*''Labeceras'' *''Laboceras'' *''Labyrinthoceras'' *''Laganoclymenia'' *''Lagowites'' *''Lamberticeras'' *''Lamites'' *''Lanceolites'' *''Lanceoloboceras'' *''Laqueoceras'' *''Latanarcestes'' *''Latisageceras'' *''Laugeites'' *''Lecanites'' *''Lechites (genus), Lechites'' *''Lecointriceras'' *''Leconteiceras'' *''Leconteites'' *''Leeites'' *''Lehmaniceras'' *''Leioceras'' *''Leiophyllites'' *''Leislingites'' *''Lemuroceras'' *''Lenotropites'' *''Lenticeras'' *''Lenticoceltites'' *''Leopoldia (Ammonite), Leopolda'' *''Leptaleoceras'' *''Leptechioceras'' *''Lepthoplites'' *''Leptoceras (ammonite), Leptoceras'' *''Leptonotoceras'' *''Leptosphinctes'' *''Leptotetragonites'' *''Leukadiella'' *''Lewesiceras'' *''Lewyites'' *''Leymeriella'' *''Liardites'' *''Liautaudia'' *''Libycoceras'' *''Lilloetia'' *''Limaites'' *''Linguaclymenia'' *''Linguatornoceras'' *''Lingyunites'' *''Lioceratoides'' *''Liosphinctes'' *''Liparoceras'' *''Lipuites'' *''Lissoceras'' *''Lissoceratoides'' *''Lissoclymenia'' *''Lissonia'' *''Lissonites'' *''Lithacoceras'' *''Lithacosphinctes'' *''Lithancylus'' *''Lobites'' *''Lobobactrites'' *''Lobokosmokeras'' *''Lobolytoceras'' *''Lobosphinctes'' *''Lobotornoceras'' *''Loczyceras'' *''Lomonossovella'' *''Longaeviceras'' *''Longobardites'' *''Longobarditoides'' *''Lopholobites'' *''Lorioloceras'' *''Lotzeites'' *''Ludwigia (ammonite), Ludwigia'' *''Hecticoceras, Lunuloceras'' *''Lupherites'' *''Luppovella'' *''Lusitanites'' *''Lycetticeras'' *''Lyelliceras'' *''Lyrogoniatites'' *''Lytheoceras'' *''Lyticoceras'' *''Lytoceras'' *''Lytocrioceras'' *''Lytodiscoides'' *''Lytogyroceras'' *''Lytohoplites''

M

Ma

*''Macrocephalites'' *''Macroscaphites'' *''Madagascarites'' *''Maenioceras'' *''Magharina'' *''Malayites'' *''Malladaites'' *''Malletophychites'' *''Maltoniceras'' *''Mammites'' *''Manambolites'' *''Mancosiceras'' *''Mangeroceras'' *''Manoloviceras'' *''Mantelliceras'' *''Manticoceras'' *''Manuaniceras'' *''Maorites'' *''Mapesites''Work, D.M. & D.R. Boardman 2003
''Mapesites'', a new Upper Pennsylvanian (Lower Virgilian) ammonoid from Kansas.
''Journal of Paleontology'' 77(6): 1195-1197. *''Marathonites'' *''Margaritropites'' *''Marianoceras'' *''Mariella'' *''Marshallites'' *''Martelites'' *''Martolites'' *''Masiaposites'' *''Masonites'' *''Maternoceras'' *''Mathoceras'' *''Mathoceratites'' *''Maximites'' *''Mayaites'' *''Mazapilites''

Me

*''Medlicottiinae, Medlicottia'' *''Meekoceras'' *''Megalytoceras'' *''Megaphyllites'' *''Megapronorites'' *''Megasphaeroceras'' *''Megatyloceras'' *''Meginoceras'' *''Melagathiceras'' *''Melchiorites'' *''Melonites'' *''Melvilloceras'' *''Menabites''

Me (cont.)

*''Menabonites'' *''Meneghiniceras'' *''Menuites'' *''Menuthiocrioceras'' *''Mercaticeras'' *''Merocanites'' *''Mescalites'' *''Mesobeloceras'' *''Mesocladiscites'' *''Mesoclymenia'' *''Mesodactylites'' *''Mesogaudryceras'' *''Mesopuzosia'' *''Mesosimoceras'' *''Mesoturrilites'' *''Metabactrites'' *''Metacanites'' *''Metacarnites'' *''Metacymbites'' *''Metadagnoceras'' *''Metaderoceras'' *''Metadimorphoceras'' *''Metadinarites'' *''Metagravesia'' *''Metahamites'' *''Metahaploceras'' *''Metahedenstroemia'' *''Metahoplites'' *''Metalegoceras'' *''Metalytoceras'' *''Metapatoceras'' *''Metapeltoceras'' *''Metaplacenticeras'' *''Metapronorites'' *''Metaptychoceras'' *''Metarnioceras'' *''Metasibirites'' *''Metasigaloceras'' *''Metassuria'' *''Metatibetites'' *''Metatissotia'' *''Metengonoceras'' *''Metinyoites'' *''Metoicoceras'' *''Metoxynoticeras'' *''Metrolytoceras'' *''Metussuria'' *''Mexicoceras''

Mi

*''Miccocephalites'' *''Michalskia'' *''Michiganites'' *''Micracanthoceras'' *''Microbactrites'' *''Microbiplices'' *''Microdactylites'' *''Microderoceras'' *''Micromphalites'' *''Microtropites'' *''Miklukhoceras'' *''Miltites'' *''Mimagoniatites'' *''Mimimitoceras'' *''Mimosphinctes'' *''Mirilentia'' *''Miroclymenia'' *''Mirojuvavites'' *''Mirosphinctes'' *''Mitonia'' *''Mixomanticoceras'' *''Miyakoceras''

Mo

*''Moffitites'' *''Mojsisovicsites'' *''Mojsisoviczia'' *''Mojsvarites'' *''Monacanthites'' *''Mongoloceras'' *''Monophyllites'' *''Moremanoceras'' *''Morphoceras'' *''Morrisiceras'' *''Morrowites'' *''Mortoniceras'' *''Moutoniceras''

Mu

*''Mucrodactylites'' *''Muensterites'' *''Muensteroceras'' *''Muniericeras''

My

*''Myloceras''

N

Na

*''Nairites'' *''Nannites'' *''Nannocardioceras'' *''Nannolytoceras'' *''Nannostephanus'' *''Nannovascoceras'' *''Nassichukites'' *''Nathorstites'' *''Nautellipsites''

Ne

*''Neancyloceras'' *''Nebraskites'' *''Nebrodites'' *''Negebites'' *''Nejdia'' *''Nelomites'' *''Neoaganides'' *''Neobibolites'' *''Neocardioceras'' *''Neochetoceras'' *''Neocladiscites'' *''Neoclypites'' *''Neocolumbites'' *''Neocomites'' *''Neocosmoceras'' *''Neocraspedites'' *''Neocrimites'' *''Neocrioceras'' *''Neodimorphoceras'' *''Neogastroplites'' *''Neogauthiericeras'' *''Medlicottiinae, Neogeoceras'' *''Neoglaphyrites'' *''Neoglyphioceras'' *''Neoglytoxoceras''

Ne (cont.)

*''Neogoniatites'' *''Neograhamites'' *''Neoharpoceras'' *''Neohimavatites'' *''Neohoploceras'' *''Neoicoceras'' *''Neokentoceras'' *''Neolioceratoides'' *''Neolissoceras'' *''Neolobites'' *''Neomantelliceras'' *''Neomanticoceras'' *''Neomicroceras'' *''Neomorphoceras'' *''Neopericyclus'' *''Neopharciceras'' *''Neophlycticeras'' *''Hypophylloceras, Neophylloceras'' *''Neopopanoceras'' *''Neopronorites'' *''Neoprotrachyceras'' *''Neoptychites'' *''Neopulchellia'' *''Neosaynoceras'' *''Neoselwynoceras'' *''Neoshumardites'' *''Neosilesites'' *''Neosirenites'' *''Neostlingoceras'' *''Neotibetites'' *''Uddenitinae, Neouddenites'' *''Neuqueniceras'' *''Nevadisculites'' *''Nevadites'' *''Nevadoceras'' *''Nevadophyllites'' *''Newboldiceras'' *''Newmarracarroceras''

Ni

*''Niceforoceras'' *''Nicklesia'' *''Nicomedites'' *''Nielsenoceras'' *''Nigericeras'' *''Nipponites'' *''Nitanoceras''

No

*''Nodiocoeloceras'' *''Nodosageceras'' *''Nodosoclymenia'' *''Nodosohoplites'' *''Nodotibetites'' *''Noetlingites'' *''Nolaniceras'' *''Nomismoceras'' *''Nordiceras'' *''Nordophiceras'' *''Noridiscites'' *''Norites'' *''Normannites'' *''Nostoceras'' *''Nothocephalites'' *''Nothosporadoceras'' *''Nothostephanus'' *''Notoceras'' *''Nowakites''

Nu

*''Nuculoceras'' *''Nummoceras''

O

*''Obrutchevites'' *''Obtusicostites'' *''Ochetoceras'' *''Ochotoceras'' *''Odontodiscoceras'' *''Oecoptychius'' *''Oecotraustes'' *''Oiophyllites'' *''Oistoceras'' *''Okribites'' *''Olcostephanus'' *''Olenekoceras'' *''Olenikites'' *''Onitshoceras'' *''Onychoceras'' *''Oosterella'' *''Ophiceras'' *''Ophilyroceras'' *''Oppelia'' *''Oraniceras'' *''Orestites'' *''Organoceras'' *''Orionoides'' *''Ornatoclymenia'' *''Orthaspidoceras'' *''Orthildaites'' *''Orthoceltites'' *''Orthogarantiana'' *''Orthosphinctes'' *''Orulganites'' *''Ostlingoceras'' *''Otoceltites'' *''Otoceras'' *''Otohoplites'' *''Otoites'' *''Otoscaphites'' *''Ovaticeras'' *''Owenites (ammonite), Owenites'' *''Owenoceras'' *''Oxintoceras'' *''Oxybeloceras'' *''Oxycerites'' *''Oxydiscites'' *''Oxylenticeras'' *''Oxynoticeras'' *''Oxyparoniceras'' *''Oxytornoceras'' *''Oxytropidoceras''

P

Pa

*''Pachycardioceras'' *''Pachyceras'' *''Pachyclymenia'' *''Pachydesmoceras'' *''Pachydiscoides'' *''Pachydiscus'' *''Pachyerymnoceras'' *''Pachylyroceras'' *''Pachylytoceras'' *''Pachypictonia'' *''Pachysphinctes'' *''Padagrosites'' *''Padragosiceras'' *''Palaeogoniatites'' *''Palaeokazachstanites'' *''Palaeophyllites'' *''Palermites'' *''Palicites'' *''Palnerostephanus'' *''Paltaopites'' *''Paltechioceras'' *''Pamphagosirenites'' *''Paprothites'' *''Paquiericeras'' *''Paraacrochordiceras'' *''Parabactrites'' *''Parabehavites'' *''Paraberriasella'' *''Parabevalites'' *''Paraboliceras'' *''Paraboliceratoides'' *''Paracadoceras'' *''Paracalycoceras'' *''Paracanthoplites'' *''Paraceltites'' *''Paraceratites'' *''Paraceratitoides'' *''Paracladiscites'' *''Paracochloceras'' *''Paraconlinoceras'' *''Paracorniceras'' *''Paracraspedites'' *''Paracravenoceras'' *''Paracrioceras'' *''Paracuariceras'' *''Paracymbites'' *''Paradanubites'' *''Paradasyceras'' *''Paradicidia'' *''Paradimeroceras'' *''Paradimorphoceras'' *''Paradinarites'' *''Paradistichites'' *''Paradolphia'' *''Paraganides'' *''Paragastrioceras'' *''Paragattendorfia'' *''Paragoceras'' *''Paraguembelites'' *''Paragymnites'' *''Parahauerites'' *''Parahildaites'' *''Parahomoceras'' *''Parahoplites'' *''Parajaubertella'' *''Parajuvavites'' *''Parakellnerites'' *''Paralcidia (ammonite), Paralcidia'' *''Paralenticeras'' *''Paralobites'' *''Paralytoceras'' *''Paramammites'' *''Parammatoceras'' *''Paranannites'' *''Paranclyoceras'' *''Parandiceras'' *''Paranorites'' *''Paranoritoides'' *''Parapallasiceras'' *''Parapatoceras'' *''Parapeltoceras'' *''Paraperrinites'' *''Paraphyllites'' *''Parapinacoceras'' *''Paraplacites'' *''Parapopanoceras'' *''Parapronorites'' *''Parapuzosia'' *''Pararasenia'' *''Pararcestes'' *''Pararnioceras'' *''Parasageceras'' *''Parasaynoceras'' *''Paraschartymites'' *''Paraschistoceras'' *''Parashumardites'' *''Parasibirites'' *''Parasilesites'' *''Parasolenoceras'' *''Paraspidites'' *''Paraspidoceras'' *''Paraspiticeras'' *''Parastieria'' *''Parastrenoceras'' *''Parasturia'' *''Paratexanites'' *''Parathetidites'' *''Parathisbites'' *''Paratibites'' *''Paratirolites'' *''Paratissotia'' *''Paratorleyoceras'' *''Paratornoceras'' *''Paratrachyceras'' *''Paratropites'' *''Paraturrilites'' *''Paravirgatites'' *''Parawedekindia'' *''Parawocklumeria'' *''Parayakutoceras'' *''Parengonoceras'' *''Parentites'' *''Parinodiceras'' *''Parkinsonia (ammonite), Parkinsonia'' *''Parodiceras'' *''Parodontoceras'' *''Paroecotraustes'' *''Paroniceras'' *''Paroxynoticeras'' *''Partschiceras'' *''Parussuria'' *''Paryphoceras'' *''Pascoeites'' *''Paskentites'' *''Passendorferia'' *''Patagiosites'' *''Paulotropites'' *''Pavlovia'' *''Pavloviceras''

Pe

*''Pearylandites'' *''Pectinatites'' *''Pedioceras'' *''Peltoceras'' *''Peltoceratoides'' *''Peltolytoceras'' *''Peltomorphites'' *''Pennoceras'' *''Pentagonoceras'' *''Pericarinoceras'' *''Pericleites'' *''Pericyclus'' *''Peripleurites'' *''Perisphinctes'' *''Peritrochia'' *''Pernoceras'' *''Peroniceras'' *''Peronoceras''

Pe (cont.)

*''Perrinites'' *''Perrinoceras'' *''Pervinquieria'' *''Petitclercia'' *''Petranoceras'' *''Petrolytoceras'' *''Petteroceras'' *''Peytonoceras''

Ph

*''Phaneroceras'' *''Phanerostephanus'' *''Pharciceras'' *''Phaularpites'' *''Phaulostephanus'' *''Phaulozigzag'' *''Phillipites'' *''Phillipsoceras'' *''Phlycticeratinae, Phlycticeras'' *''Phlycticrioceras'' *''Phlyseogrammoceras'' *''Phoenixites'' *''Phormedites'' *''Phricodoceras'' *''Phylloceras'' *''Phyllocladiscites'' *''Phyllopachyceras'' *''Phylloptychoceras'' *''Phyllytoceras'' *''Phymatoceras'' *''Physematites'' *''Physeogrammoceras'' *''Physodoceras''

Pi

*''Picenia'' *''Pictetia (ammonite), Pictetia'' *''Pictonia'' *''Pimelites'' *''Pinaclymenia'' *''Pinacoceras'' *''Pinacoplacites'' *''Piriclymenia''

Pl

*''Placenticeras'' *''Placites'' *''Planammatoceras'' *''Planisphinctes'' *''Plasmatoceras'' *''Platotropites'' *''Platyclymenia'' *''Platycuccoceras'' *''Platygoniatites'' *''Platylenticeras'' *''Platynoticeras'' *''Platypleuroceras'' *''Playfordites'' *''Plesiacanthoceras'' *''Plesiacanthoides'' *''Plesiohamites'' *''Plesiospitidiscus'' *''Plesiotissotia'' *''Plesioturrilites'' *''Pleuroacanthites'' *''Macrocephalites, Pleurocephalites'' *''Pleuroceras (ammonite), Pleuroceras'' *''Pleurodistichites'' *''Pleurohoplites'' *''Pleurolytoceras'' *''Pleuronodoceras'' *''Pleuropinacoceras'' *''Pleurotexanites'' *''Pleydellia'' *''Plictetia''

Po

*''Poculisphinctes'' *''Poecilomorphus'' *''Polaricyclus'' *''Politoceras'' *''Polonites'' *''Polonoceras'' *''Polymorphites'' *''Polyplectites'' *''Polyplectus'' *''Polyptychites'' *''Polyptychoceras'' *''Polysphinctes'' *''Pomerania (ammonite), Pomerania'' *''Pompeckioceras'' *''Pompeckjites'' *''Ponteixites'' *''Ponticeras'' *''Popanites'' *''Popanoceras'' *''Poporites'' *''Porpoceras'' *''Postglatziella'' *''Posttornoceras''

Pr

*''Praebigotites'' *''Praedaraelites'' *''Praeglyphioceras'' *''Praemanambolites'' *''Praemeroceras'' *''Praemuniericeras'' *''Praeparkinsonia'' *''Praepolyplectus'' *''Praesphaeroceras'' *''Praestrigites'' *''Praetollia'' *''Pravitoceras'' *''Preflorianites'' *''Preflorianitoides'' *''Prenkites'' *''Preshumardites'' *''Presimoceras'' *''Pricella'' *''Prionites'' *''Prionoceras'' *''Prionocycloceras'' *''Prionocyclus'' *''Prionodoceras'' *''Proarcestes'' *''Proavites'' *''Probeloceras'' *''Procarnites'' *''Procerites'' *''Procerozigzag'' *''Procheloniceras'' *''Prochorites'' *''Procladiscites'' *''Procliviceras'' *''Procolumbites'' *''Procraspedites'' *''Prodactylioceras'' *''Prodeshayesites'' *''Prodromites'' *''Progalbanites'' *''Progeronia'' *''Progonoceratites'' *''Progonioclymenia'' *''Prograyiceras'' *''Proharpoceras'' *''Prohauericeras'' *''Prohecticoceras'' *''Prohelicoceras'' *''Prohungarites'' *''Prohysteroceras'' *''Projuvavites'' *''Prolecanites'' *''Proleopoldia'' *''Proleymeriella'' *''Prolobites'' *''Prolyelliceras'' *''Promantelliceras'' *''Promicroceras'' *''Proniceras''

Pr (cont.)

*''Pronoetlingites'' *''Pronorites'' *''Propectinatites'' *''Properisphinctes'' *''Properrinites'' *''Propinacoceras'' *''Proplacenticeras'' *''Proplanulites'' *''Propopanoceras'' *''Proptychites'' *''Proptychitoides'' *''Prorasenia'' *''Prorsisphinctes'' *''Prosaphites'' *''Proshumardites'' *''Prosiceras'' *''Prososphinctes'' *''Prososphinctoides'' *''Prosphingites'' *''Prostacheoceras'' *''Protacanthoceras'' *''Protacanthodiscus'' *''Protacanthoplites'' *''Protaconeceras'' *''Protactoclymenia'' *''Protanclyoceras'' *''Protanisoceras'' *''Protengonoceras'' *''Protetragonites'' *''Proteusites'' *''Protexanites'' *''Prothalassoceras'' *''Protimanites'' *''Protocanites'' *''Protoceras (ammonite), Protoceras'' *''Protoecotrausites'' *''Protogrammoceras'' *''Protohoplites'' *''Protophites'' *''Protoplatytes'' *''Protopopanoceras'' *''Protornoceras'' *''Protosageceras'' *''Protothurmannia'' *''Prototoceras'' *''Protoxyclymenia'' *''Protrachyceras'' *''Protropites'' *''Proturrilitoides'' *''Uddenitinae, Prouddenites'' *''Provirgatites''

Ps

*''Pseudacompsoceras'' *''Pseudaetomoceras'' *''Pseudagathiceras'' *''Pseudammatoceras'' *''Pseudargentiniceras'' *''Pseudarietites'' *''Pseudarisphinctes'' *''Pseudaspidites'' *''Pseudaspidoceras'' *''Pseudharpoceras'' *''Pseudhelicoceras'' *''Pseudhimalayites'' *''Pseudinvoluticeras'' *''Pseudoaganides'' *''Pseudoaspidoceras'' *''Pseudobactrites'' *''Pseudobaculites'' *''Pseudobarroisiceras'' *''Hecticoceras, Pseudobrightia'' *''Pseudocadoceras'' *''Pseudocalycoceras'' *''Pseudocardioceras'' *''Pseudocarnites'' *''Pseudoceltites'' *''Pseudoclambites'' *''Pseudoclydoniceras'' *''Pseudoclymenia'' *''Pseudocosmoceras'' *''Pseudodanubites'' *''Pseudofavrella'' *''Pseudoflemingites'' *''Pseudofoordites'' *''Pseudogarantiana'' *''Pseudogarnieria'' *''Pseudogastrioceras'' *''Pseudoglaphyrites'' *''Pseudogrammoceras'' *''Pseudogregoryceras'' *''Pseudohalorites'' *''Pseudohaploceras'' *''Pseudoinvoluticeras'' *''Pseudojacobites'' *''Pseudokatroliceras'' *''Pseudokossmaticeras'' *''Pseudokymatites'' *''Pseudoleymeriella'' *''Pseudolillia'' *''Pseudolioceras'' *''Pseudolissoceras'' *''Pseudomercaticeras'' *''Pseudoneoptychites'' *''Pseudonomismoceras'' *''Pseudoosterella'' *''Pseudoparalegoceras'' *''Pseudopeltoceras'' *''Pseudoperisphinctes'' *''Pseudophyllites'' *''Pseudoplacenticeras'' *''Pseudopolyplectus'' *''Pseudoppelia'' *''Pseudoprobeloceras'' *''Pseudopronorites'' *''Pseudopuzosia'' *''Pseudosageceras'' *''Pseudosaynella'' *''Pseudoschistoceras'' *''Pseudoschloenbachia'' *''Pseudosimoceras'' *''Pseudosirenites'' *''Pseudosonneratia'' *''Pseudothetidites'' *''Pseudothurmannia'' *''Pseudotibetites'' *''Pseudotirolites'' *''Pseudotissotia'' *''Pseudotoceras'' *''Pseudotoites'' *''Pseudotropites'' *''Pseudovidrioceras'' *''Pseudovirgatites'' *''Pseudowaagenia'' *''Pseudoxybeloceras'' *''Pseuduptonia'' *''Psiloceras'' *''Psilocladiscites'' *''Psilohamites'' *''Psilophyllites'' *''Psilosturia'' *''Psilotissotia''

Pt

*''Pterolytoceras'' *''Pteroscaphites'' *''Pterosirenites'' *''Ptycharcestes'' *''Ptychites'' *''Ptychoceras'' *''Ptycholytoceras'' *''Ptychophylloceras''

Pu

*''Puchenquia'' *''Puebloites'' *''Pulchellia'' *''Hecticoceras, Putealiceras'' *''Puzosia'' *''Puzosigella''

Q

*''Qiannanites'' *''Quasicravenoceras'' *''Quasintoceras'' *''Quenstedtoceras'' *''Quinnites'' *''Quitmannites''

R

*''Radstockiceras'' *''Raimondiceras'' *''Rakusites'' *''Ramosites'' *''Rasenia'' *''Rasenoides'' *''Raymondiceras'' *''Rectoclymenia'' *''Reesidites'' *''Rehmannia (ammonite), Rehmannia'' *''Reiflingites'' *''Reineckeia'' *''Reineckeites'' *''Renites'' *''Renziceras'' *''Repossia'' *''Reticuloceras'' *''Retites'' *''Reynesella'' *''Reynesoceras'' *''Reynesocoeloceras'' *''Rhabdoceras'' *''Rhacophyllites'' *''Rhadinites'' *''Rhaeboceras'' *''Rhampidoceras'' *''Rhiphaeoclymenia'' *''Rhiphaeocyclus'' *''Rhymmoceras'' *''Rhytidohoplites'' *''Riasanites'' *''Richardsonites'' *''Rimkinites'' *''Ringsteadia'' *''Roinghites'' *''Rollerites'' *''Rollieria'' *''Roloboceras'' *''Romaniceras'' *''Romanites'' *''Ropoloceras'' *''Rossalites'' *''Rotodiscoceras'' *''Rotopericyclus'' *''Rubroceras'' *''Rugiferites'' *''Rursiceras'' *''Rusoceras'' *''Ryugasella''

S

Sa

*''Sageceras'' *''Sagenites'' *''Saghalinites'' *''Sakhaites'' *''Sakmarites'' *''Salaziceras'' *''Salfeldiella'' *''Saltericeras'' *''Salterites'' *''Sandbergeroceras'' *''Sandlingites'' *''Sangzhites'' *''Sanmartinoceras'' *''Sanyangites'' *''Sarasinella'' *''Saxoceras'' *''Saynella'' *''Saynoceras''

Sc

*''Scalarites'' *''Scaphamites'' *''Scaphites'' *''Scaphitodites'' *''Scarburgiceras'' *''Schaffhauseria'' *''Schartymites'' *''Schindewolfites'' *''Schindewolfoceras'' *''Schistoceras'' *''Schistophylloceras'' *''Schloenbachia'' *''Schlotheimia'' *''Schuichengoceras'' *''Schwandorfia'' *''Sciponoceras'' *''Schizoclymenia'' *''Scoticardioceras''

Se

*''Sellaclymenia'' *''Sellagoniatites'' *''Sellanarcestes'' *''Selwynoceras'' *''Semenovites'' *''Semiformiceras'' *''Semiornites'' *''Serpianites'' *''Serramanticoceras'' *''Seymourites''

Sh

*''Shahrudites'' *''Shakraceras'' *''Shangraoceras'' *''Shaoyangoceras'' *''Sharpeiceras'' *''Shasticrioceras'' *''Shastoceras'' *''Shengoceras'' *''Shikhanites'' *''Shirbuirnia'' *''Shouchangoceras'' *''Shumardites''

Si

*''Siberiptychites'' *''Sibirites'' *''Sibyllites'' *''Sicanites'' *''Sicilioceras'' *''Siculites'' *''Siemiradzkia'' *''Sigaloceras'' *''Silberlingites'' *''Silenticeras'' *''Silesites'' *''Silesitoides'' *''Simaspidoceras'' *''Simbirskites'' *''Simichelloceras''

Si (cont.)

*''Simmoceras'' *''Simoceras'' *''Simocosmoceras'' *''Simonyceras'' *''Simosphinctes'' *''Simotoichites'' *''Sindeites'' *''Sinotites'' *''Sinzovia'' *''Sirenites'' *''Sirenotrachyceras'' *''Sivajiceras'' *''Sizilites''

Sk

*''Skirroceras'' *''Skolekostephanus''

Sl

*''Slatterites''

So

*''Sobolewia'' *''Sohlites'' *''Sokolovites'' *''Solenoceras'' *''Solgerites'' *''Soliclymenia'' *''Somaliceras'' *''Somalites'' *''Somoholites'' *''Sonneratia (ammonite), Sonneratia'' *''Sonninia'' *''Sornayceras'' *''Sosioceras'' *''Sowerbyceras''

Sp

*''Spathiceras'' *''Spathites'' *''Speetoniceras'' *''Sphaeroceras'' *''Sphaerocladiscites'' *''Sphaerocoeloceras'' *''Sphaerodomites'' *''Sphaeromanticoceras'' *''Sphaeroptychius'' *''Sphenarpites'' *''Sphenoclymenia'' *''Sphenodiscus'' *''Sphingites'' *''Spinammatoceras'' *''Spinokosmoceras'' *''Spinoleiophyllites'' *''Spiroceras'' *''Spirogmoceras'' *''Spirolegoceras'' *''Spiticeras'' *''Spitidiscus'' *''Sporadoceras''

St

*''Stacheites'' *''Stacheoceras'' *''Stantonoceras'' *''Stantonites'' *''Staufenia'' *''Stegoxyites'' *''Stehnocephalites'' *''Steinmannites'' *''Stemmatoceras'' *''Stenarcestes'' *''Stenocadoceras'' *''Stenoclymenia'' *''Stenocyclus'' *''Stenoglaphyrites'' *''Stenopharciceras'' *''Stenopopanoceras'' *''Stenopronorites'' *''Stephanites''

St (cont.)

*''Stephanoceras'' *''Stikinoceras'' *''Stoliczkaia'' *''Stolleites'' *''Stomohamites'' *''Stoppaniceras'' *''Streblites'' *''Strebliticeras'' *''Strenoceras'' *''Striatosirenites'' *''Strigoceras'' *''Strigogoniatites'' *''Strungia'' *''Sturia'' *''Styracoceras'' *''Styrites''

Su

*''Subalpinites'' *''Subarcthoplites'' *''Subastieria'' *''Subbarroisiceras'' *''Subbonarellia'' *''Subcollina'' *''Subcolumbites'' *''Subcraspedites'' *''Subdichotomoceras'' *''Subgrossouvria'' *''Subinyoites'' *''Subitoceras'' *''Subkossmatia'' *''Sublithacoceras'' *''Hecticoceras, Sublunuloceras'' *''Submantelliceras'' *''Submeekoceras'' *''Submortoniceras'' *''Subnebrodites'' *''Subneumayria'' *''Subolenekites'' *''Suboosterella'' *''Subperrinites'' *''Subplanites'' *''Subprionocyclus'' *''Subpulchellia'' *''Subsaynella'' *''Subshumardites'' *''Substeueroceras'' *''Substreblites'' *''Subthurmannia'' *''Subtissotia'' *''Subvertebriceras'' *''Subvishnuites'' *''Sudeticeras'' *''Sulciferites'' *''Sulcimitoceras'' *''Sulcoclymenia'' *''Sulcodimorphoceras'' *''Sulcogirtyoceras'' *''Sulcohamites'' *''Sulcohamitoides'' *''Sulcohoplites'' *''Sundaites'' *''Sunites'' *''Surenites'' *''Sutneria''

Sv

*''Svalbardiceras'' *''Sverdrupites'' *''Svetlanoceras''

Sy

*''Sympolycyclus'' *''Synartinskia'' *''Syngastrioceras'' *''Synpharciceras'' *''Synuraloceras'' *''Synwocklumeria'' *''Medlicottiinae, Syrdenites''

T

Ta

*''Tabantalites'' *''Taffertia'' *''Talenticeras'' *''Tamarites'' *''Tapashanites'' *''Taramelliceras'' *''Tardeceras'' *''Tarrantoceras'' *''Taskanites'' *''Tauroceras (ammonite), Tauroceras''

Te

*''Tectiretites'' *''Tegoceras'' *''Teicherticeras'' *''Telermoceras'' *''Teloceras'' *''Telodactylites'' *''Telodactylus'' *''Temnoptychites'' *''Terektites'' *''Teshioites'' *''Tetragonites (syn. Epigoniceras)'' *''Tetrahoplites'' *''Tetrahoplitoides'' *''Tetraspidoceras'' *''Texanites'' *''Texoceras''

Th

*''Thallassoceras'' *''Thambites'' *''Thamboceras'' *''Thanamites'' *''Theganoceras'' *''Thetidites'' *''Thisbites'' *''Thomasites (ammonite), Thomasites'' *''Thomelites'' *''Thorsteinssonoceras'' *''Thraxites'' *''Thurmannia'' *''Thurmanniceras''

Ti

*''Tibetites'' *''Ticinites'' *''Tiltoniceras'' *''Timanites''

Ti (cont.)

*''Timanoceras'' *''Timorites'' *''Tirolites'' *''Tissotia'' *''Titanites'' *''Tithopeltoceras''

Tj

*''Tjururpites''

Tm

*''Tmaegoceras'' *''Tmaegophioceras'' *''Tmetoceras''

To

*''Tokurites'' *''Tollia (ammonite), Tollia'' *''Tolypeceras'' *''Tompophiceras'' *''Tongluceras'' *''Tongoboroceras'' *''Tonoceras'' *''Torcapella'' *''Toricellites'' *''Torleyoceras'' *''Tornia'' *''Tornoceras'' *''Tornquisites'' *''Tornquistites'' *''Torquatisphinctes'' *''Tovebirkelundites'' *''Toxamblyites'' *''Toxolioceras'' *''Tozerites''

Tr

*''Trachybaculites'' *'' Trachyceras'' *''Trachylytoceras'' *''Trachyphyllites'' *''Trachypleuraspidites'' *''Trachysagenites'' *''Trachyscaphites'' *''Trachystenoceras'' *''Tragodesmoceras'' *''Tragodesmoceroides'' *''Tragolytoceras''

Tr (cont.)

*''Tragophylloceras'' *''Tragorhacoceras'' *''Transicoeloceras'' *''Traskites'' *''Treptocceras'' *''Trettinoceras'' *''Triaclymenia'' *''Triagolytoceras'' *''Triainoceras'' *''Tridentites'' *''Trigonogastrioceras'' *''Trilobiticeras'' *''Trimanticoceras'' *''Trimarginia'' *''Trimarginites'' *''Triozites'' *''Tritropidoceras'' *''Trizonoceras'' *''Trochleiceras'' *''Trochoclymenia'' *''Trochoceras'' *''Trolliceras'' *''Tropaeum'' *''Tropiceltites'' *''Tropidoceras'' *''Tropigastrites'' *''Tropigymnites'' *''Tropites'' *''Tropitoides'' *''Truyolsoceras''

Ts

*''Tsvetkovites''

Tu

*''Tuberodiscoides'' *''Tugurites'' *''Tulites'' *''Tumaroceras'' *''Tumilites'' *''Tunesites'' *''Tunglanites'' *''Turrilites'' *''Turrilitoides''

Ty

*''Tympanoceras'' *''Tyrannites''

U

*''Uchtites'' *''Uddenitinae, Uddenites'' *''Uddenitinae, Uddenoceras'' *''Ugamites'' *''Uhligella'' *''Uhligia (cephalopod), Uhligia'' *''Uhligites'' *''Umbetoceras'' *''Umiaites'' *''Unipeltoceras'' *''Unquatornoceras'' *''Uptonia'' *''Urakawites'' *''Uraloceras'' *''Uraloclymenia'' *''Uralopronorites'' *''Ussuria'' *''Ussurites'' *''Utaturiceras''

V

*''Vacekia'' *''Valanginites'' *''Valdedorsella'' *''Valentolytoceras'' *''Vallites'' *''Vandaites'' *''Vascoceras'' *''Vavilovites'' *''Velebites'' *''Veleziceras'' *''Venezoliceras'' *''Verancoceras'' *''Vermiceras'' *''Vermisphinctes'' *''Verneuilites'' *''Vertebriceras'' *''Vertebrites'' *''Veveysiceras'' *''Vicininodiceras'' *''Vickohlerites'' *''Vidrioceras'' *''Villania (ammonite), Villania'' *''Vinalesites'' *''Vinalesphinctes'' *''Virgataxioceras'' *''Virgatites'' *''Virgatopavlovia'' *''Virgatosimoceras'' *''Virgatosphinctes'' *''Virgatospinctoides'' *''Vishnuites'' *''Voehringerites'' *''Vredenburgites''

W

*''Waagenina'' *''Waagenoceras'' *''Waehneroceras'' *''Wagnericeras'' *''Waldthausenites'' *''Wangoceras'' *''Wasatchites'' *''Watinoceras'' *''Wedekindella'' *''Wellerites'' *''Wellsites'' *''Welterites'' *''Werneroceras'' *''Wewokites'' *''Wheatleyites'' *''Whitbyiceras'' *''Wichmanniceras'' *''Wiedeyoceras'' *''Winchelloceras'' *''Windhauseniceras'' *''Winslowoceras'' *''Wintonia'' *''Witchellia'' *''Wocklumeria'' *''Wopfingites'' *''Wordieoceras'' *''Worthoceras'' *''Wrightoceras'' *''Wyomingites (ammonite), Wyomingites''

X

*''Xenoceltites'' *''Xenocephalites'' *''Xenodiscus'' *''Xenodrepanites'' *''Xipheroceras'' *''Xiphogymnites''

Y

*''Yabeiceras'' *''Yakounia'' *''Yakutoceras'' *''Yakutoglaphyrites'' *''Yangites'' *''Yezoites'' *''Yinoceras'' *''Yokoyamaceras''

Z

*''Zadelsdorfia'' *''Zaraiskites'' *''Zealandites'' *''Zemistephanus'' *''Zenoites'' *''Zenostephanus'' *''Zephyroceras'' *''Zetoceras'' *''Zigzagiceras'' *''Ziyunites'' *''Zonovia'' *''Zuercherella'' *''Zugodactylites'' *''Zugokosmoceras'' *''Zuluiceras'' *''Zuluscaphites'' *''Zurcherella'' *''Zurcheria''

References

Uncited genera names can be verified at: *Sepkoski, J.J. Jr. 2002. A compendium of fossil marine animal genera. ''Bulletins of American Paleontology'' 363: 1–560
Sepkoski's Online Genus Database

External links

The Paleobiology Database entry on "Ammonoidea"

Sepkoski's Online Genus Database entry on "Cephalopoda"
{{DEFAULTSORT:Ammonites Ammonite genera, Lists of prehistoric molluscs Lists of animal genera (alphabetic)