Perisphinctoidea

	Perisphinctoidea Perisphinctoidea, formerly Perisphinctaceae, is a superfamily of Middle Jurassic (Bajocian) to Lower Cretaceous (Barremian) ammonites, commonly with evolute shells with strong ribbing that typically divides about mid flank before crossing the venter. Classification Some 16 families have been recognized in the Perisphinctoidea. The following is based on Donovan ''et al.'' 1981Donovan, Callomon and Howarth 1981 Classification of the Jurassic Ammonitina; Systematics Association. with modification from the Treatise on Invertebrate Paleontology, Part L (1957) * Perisphinctidae: Middle and Upper Jurassic root stock, derived from the Stephanoceratidae (Middle Jurassic direct derivatives of the Perisphinctidae) * Morphiceratidae * Tulitidae * Reineckeiidae Pachyceratidae Aspidoceratidae (early Upper Jurassic (Oxfordian) derivatives of Perisphinctidae) Aulacostephanidae Ataxioceratidae (mid Upper Jurassic (Kimmeridgian) derivatives of the Ataxioceratidae) * Dorsoplanitidae ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Perisphinctoidea Perisphinctoidea, formerly Perisphinctaceae, is a superfamily of Middle Jurassic (Bajocian) to Lower Cretaceous (Barremian) ammonites, commonly with evolute shells with strong ribbing that typically divides about mid flank before crossing the venter. Classification Some 16 families have been recognized in the Perisphinctoidea. The following is based on Donovan ''et al.'' 1981Donovan, Callomon and Howarth 1981 Classification of the Jurassic Ammonitina; Systematics Association. with modification from the Treatise on Invertebrate Paleontology, Part L (1957) * Perisphinctidae: Middle and Upper Jurassic root stock, derived from the Stephanoceratidae (Middle Jurassic direct derivatives of the Perisphinctidae) * Morphiceratidae * Tulitidae * Reineckeiidae Pachyceratidae Aspidoceratidae (early Upper Jurassic (Oxfordian) derivatives of Perisphinctidae) Aulacostephanidae Ataxioceratidae (mid Upper Jurassic (Kimmeridgian) derivatives of the Ataxioceratidae) * Dorsoplanitidae ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Ammonitina Ammonitina comprises a diverse suborder of ammonite cephalopods that lived during the Jurassic and Cretaceous periods of the Mesozoic Era. They are excellent index fossils, and it is often possible to link the rock layer in which they are found to specific geological time periods. The shells of Ammonitina are typically planospiral; coiled in a plane, symmetrical side to side. Shells vary in form, including those that are evolute, such that all whorls are exposed, and those that are strongly involute with only the outer whorl showing. They may be strongly ribbed, some bearing nodes and spines; others are entirely smooth. Some have broad rounded venters (the outer rim); in others the venter is sharp and keel-like. Sutures are generally ammonitic, with intricately patterned saddle and lobes. However, in some derived forms the suture becomes simplified, ceratitic, even goniatitic. The Ammonitina are derived from the Phylloceratina, another ammonitid suborder which has its origin in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Aulacostephanidae Aulacostephanidae is an extinct ammonoid cephalopod family belonging to the superfamily Perisphinctoidea. These fast-moving nektonic carnivores lived during the Upper Jurassic period, from the Oxfordian to Tithonian ages. Genera Genera within this family include: Paleobiology Database Sepkoski Online '' Aulacostephanus '' '' Pictonia '' '' [...More Info...] [...Related Items...] OR:* [Wikipedia] [Google] [Baidu]
	Neocomitidae Neocomitidae is a family of Lower Cretaceous ammonitids comprising genera with strongly ribbed evolute (all whorls exposed) to smooth, fairly involute (inner whorls mostly hidden) shells. In the 1957 description of the family Neocomitidae was regarded as the subfamily Neocomitinae within the Berriasellidae, a family within the Perisphinctoidea that ranged from the Late Jurassic into the Early Cretaceous. In a more recent treatment berriaselids are regarded as a subfamily within the Neocomitidae. Current opinion differers from the 1967 placement of Neocomitidae in the Perisphinctoidea but rather includes it in the superfamily Endemoceratoidea. Genera ''Acanthodiscus'' Uhlig, 1905 ''Argentiniceras'' Spath, 1924 '' Berriasella'' Uhlig, 1905 '' Decliveites'' Aguirre-Urreta and Rawson, 2010 '' Delphinella'' Le Hegarat, 1973 '' Delphinites'' Sayn, 1901 '' Distoloceras'' Hyatt, 1900 '' Elenaella'' Nikolov, 1966 '' Eleniceras'' Breskovski, 1967 '' Ellenaela'' Nikolov, 19 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Himalayitidae Himalayitidae is an extinct family of ammonites in the superfamily Perisphinctoidea. The family existed from the Tithonian of the Jurassic to the Berriasian of the 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 around 79 million years, it is the longest geological period of th .... The family is thought to derive from Perisphinctidae. References External links * * Ammonitida families Perisphinctoidea Jurassic ammonites Tithonian first appearances Early Cretaceous extinctions {{ammonitina-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Pachyceratidae Pachyceratidae is a family of Perisphinctoidean ammonites from the upper Middle - and lower Upper Jurassic. Genera within the Pachyceratidae have shells that are in general moderately involte but with most of the inner whorls exposed; whorl sections subquadrate to subtrapezoidal, with rounded venter. Ribbing is strong, in some sharp. Primary ribs typically branch above mid flanks into twos, threes, and even fours. The Pachyceratidae, according to Donovan et al. (1981), were derived from the Perisphinctidae in the mid Callovian at about the same time as the longer lived Aspidoceratidae, lasting only into the subsequent Oxfordian. This differs from the perspective of Arkell, et al. (1957) in the Treatise wherein the Pachyceridae is included in the Stephanoceratoidea Stephanoceratoidea, formerly Stephanocerataceae, is a superfamily of middle- upper Jurassic ammonoid cephalopods within the order Ammonitida containing diverse forms, generally with sharp ribbing and complex sutu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Ataxioceratidae Ataxioceratidae is an extinct Ammonite cephalopod family included in the superfamily Perisphinctoidea. These fast-moving nektonic carnivores lived during the Jurassic and Cretaceous periods. Genera '' Catutosphinctes'' '' Choicensisphinctes'' '' Katroliceras'' ''Lithacoceras'' '' Lithacosphinctes'' '' Orthosphinctes'' Distribution Fossils of species within this genus have been found in the Cretaceous of Yemen, as well as in Jurassic The Jurassic ( ) is a Geological period, geologic period and System (stratigraphy), stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately Mya. The J ... sediments of Antarctica, Argentina, Canada, China, Cuba, France, Germany, Hungary, India, Iran, Italy, Madagascar, Nepal, Somalia, Spain, United States. References Ammonitida families Perisphinctoidea Jurassic ammonites Cretaceous ammonites Oxfordian first appearances Early Cretaceous ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Aspidoceratidae The Aspidoceratidae comprise a family of middle and upper Jurassic ammonites that make up part of the superfamily Perisphinctoidea, characterized by evolute shells, commonly stocky, that tend to develop tubercles. The Aspidoceratidae are thought to be derived from the Perisphinctidae and have been subdivided into three subfamilies, the Aspidoceratinae, Peltoceratinae, and Simoceratinae. Subfamilies and genera * Aspidoceratinae Zittel 1895 '' Aspidoceras'' '' Chinamecaceras'' Cantu-Chapa 2006 ''Epaspidoceras'' '' Euaspidoceras'' ** ''Orthaspidoceras'' * Peltoceratinae Spath 1924 ''Peltoceras'' '' Peltoceratoides'' ** ''Rursiceras'' * Simoceratinae The Simoceratinae is a subfamily in the Aspidoceratidae The Aspidoceratidae comprise a family of middle and upper Jurassic ammonites that make up part of the superfamily Perisphinctoidea, characterized by evolute shells, commonly stocky, tha ... '' Simoceras'' '' Virgatosimoceras'' References * Arkel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Reineckeiidae Reineckeiidae is an extinct ammonoid cephalopod family belonging to the superfamily Perisphinctoidea. These fast-moving nektonic carnivores lived during the Jurassic period, from the Callovian In the geologic timescale, the Callovian is an age and stage in the Middle Jurassic, lasting between 166.1 ± 4.0 Ma (million years ago) and 163.5 ± 4.0 Ma. It is the last stage of the Middle Jurassic, following the Bathonian and preceding the ... to the Oxfordian. References External links Ammonites Ammonitida families Perisphinctoidea Callovian first appearances Late Jurassic extinctions {{Ammonitina-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Olcostephanidae Olcostephanidae is an extinct ammonoid cephalopod family belonging to the superfamily Perisphinctoidea. These fast-moving nektonic carnivores lived from the Jurassic to the Cretaceous period. Genera '' Bihenduloceras'' '' Olcostephanus'' Neumayr, 1875 '' Saynoceras'' '' Subastieria'' Spath, 1923 '' Taraisites'' Canta-Chapa, 1966 '' Valanginites'' Sayn, 1910 Distribution Fossils of species within this genus have been found in the Cretaceous sediments of Antarctica, Argentina, Austria, Chile, Colombia, Czech Republic, Czechoslovakia, France, Hungary, Italy, Mexico, Morocco, Peru, Poland, Portugal, Romania, Slovakia, South Africa, Spain, Russia, United States, as well as in the Jurassic The Jurassic ( ) is a Geological period, geologic period and System (stratigraphy), stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately Mya. The J ... of Argentina and Mexico. References ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Craspeditidae ''Craspeditidae'' is an ammonoid cephalopod family included in the Perisphinctoidea superfamily. Some classifiers consider the Craspeditidae a subfamily in the Polyptychitidae. These ammonites lived during the Late Jurassic and Early 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 around 79 million years, it is the longest geological period of th .... Genera '' Craspedites'' † '' Platylenticeras'' † '' Tolypeceras'' † References Cretaceous ammonites Jurassic ammonites Perisphinctoidea Ammonitida families {{ammonitina-stub ... [...More Info...] [...Related Items...] OR:* [Wikipedia] [Google] [Baidu]
	Oosterellidae Oosterellidae is an extinct ammonoid cephalopod family belonging to the superfamily Perisphinctoidea. These fast-moving nektonic carnivores lived during the Cretaceous. Genera '' Oosterella'' '' Pseudoosterella'' Distribution Fossils of species within this genus have been found in the 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 around 79 million years, it is the longest geological period of th ... sediments of Argentina, Austria, Colombia, Czech Republic, France, Hungary, Italy, Mexico, Morocco, Romania and Slovakia. References Ammonitida families Perisphinctoidea Cretaceous ammonites Ammonites of Europe Early Cretaceous first appearances Early Cretaceous extinctions {{ammonitina-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]

	Perisphinctoidea Perisphinctoidea, formerly Perisphinctaceae, is a superfamily of Middle Jurassic (Bajocian) to Lower Cretaceous (Barremian) ammonites, commonly with evolute shells with strong ribbing that typically divides about mid flank before crossing the venter. Classification Some 16 families have been recognized in the Perisphinctoidea. The following is based on Donovan ''et al.'' 1981Donovan, Callomon and Howarth 1981 Classification of the Jurassic Ammonitina; Systematics Association. with modification from the Treatise on Invertebrate Paleontology, Part L (1957) * Perisphinctidae: Middle and Upper Jurassic root stock, derived from the Stephanoceratidae (Middle Jurassic direct derivatives of the Perisphinctidae) * Morphiceratidae * Tulitidae * Reineckeiidae Pachyceratidae Aspidoceratidae (early Upper Jurassic (Oxfordian) derivatives of Perisphinctidae) Aulacostephanidae Ataxioceratidae (mid Upper Jurassic (Kimmeridgian) derivatives of the Ataxioceratidae) * Dorsoplanitidae ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Perisphinctoidea Perisphinctoidea, formerly Perisphinctaceae, is a superfamily of Middle Jurassic (Bajocian) to Lower Cretaceous (Barremian) ammonites, commonly with evolute shells with strong ribbing that typically divides about mid flank before crossing the venter. Classification Some 16 families have been recognized in the Perisphinctoidea. The following is based on Donovan ''et al.'' 1981Donovan, Callomon and Howarth 1981 Classification of the Jurassic Ammonitina; Systematics Association. with modification from the Treatise on Invertebrate Paleontology, Part L (1957) * Perisphinctidae: Middle and Upper Jurassic root stock, derived from the Stephanoceratidae (Middle Jurassic direct derivatives of the Perisphinctidae) * Morphiceratidae * Tulitidae * Reineckeiidae Pachyceratidae Aspidoceratidae (early Upper Jurassic (Oxfordian) derivatives of Perisphinctidae) Aulacostephanidae Ataxioceratidae (mid Upper Jurassic (Kimmeridgian) derivatives of the Ataxioceratidae) * Dorsoplanitidae ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Ammonitina Ammonitina comprises a diverse suborder of ammonite cephalopods that lived during the Jurassic and Cretaceous periods of the Mesozoic Era. They are excellent index fossils, and it is often possible to link the rock layer in which they are found to specific geological time periods. The shells of Ammonitina are typically planospiral; coiled in a plane, symmetrical side to side. Shells vary in form, including those that are evolute, such that all whorls are exposed, and those that are strongly involute with only the outer whorl showing. They may be strongly ribbed, some bearing nodes and spines; others are entirely smooth. Some have broad rounded venters (the outer rim); in others the venter is sharp and keel-like. Sutures are generally ammonitic, with intricately patterned saddle and lobes. However, in some derived forms the suture becomes simplified, ceratitic, even goniatitic. The Ammonitina are derived from the Phylloceratina, another ammonitid suborder which has its origin in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Aulacostephanidae Aulacostephanidae is an extinct ammonoid cephalopod family belonging to the superfamily Perisphinctoidea. These fast-moving nektonic carnivores lived during the Upper Jurassic period, from the Oxfordian to Tithonian ages. Genera Genera within this family include: Paleobiology Database Sepkoski Online '' Aulacostephanus '' '' Pictonia '' '' [...More Info...] [...Related Items...] OR:* [Wikipedia] [Google] [Baidu]
	Neocomitidae Neocomitidae is a family of Lower Cretaceous ammonitids comprising genera with strongly ribbed evolute (all whorls exposed) to smooth, fairly involute (inner whorls mostly hidden) shells. In the 1957 description of the family Neocomitidae was regarded as the subfamily Neocomitinae within the Berriasellidae, a family within the Perisphinctoidea that ranged from the Late Jurassic into the Early Cretaceous. In a more recent treatment berriaselids are regarded as a subfamily within the Neocomitidae. Current opinion differers from the 1967 placement of Neocomitidae in the Perisphinctoidea but rather includes it in the superfamily Endemoceratoidea. Genera ''Acanthodiscus'' Uhlig, 1905 ''Argentiniceras'' Spath, 1924 '' Berriasella'' Uhlig, 1905 '' Decliveites'' Aguirre-Urreta and Rawson, 2010 '' Delphinella'' Le Hegarat, 1973 '' Delphinites'' Sayn, 1901 '' Distoloceras'' Hyatt, 1900 '' Elenaella'' Nikolov, 1966 '' Eleniceras'' Breskovski, 1967 '' Ellenaela'' Nikolov, 19 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Himalayitidae Himalayitidae is an extinct family of ammonites in the superfamily Perisphinctoidea. The family existed from the Tithonian of the Jurassic to the Berriasian of the 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 around 79 million years, it is the longest geological period of th .... The family is thought to derive from Perisphinctidae. References External links * * Ammonitida families Perisphinctoidea Jurassic ammonites Tithonian first appearances Early Cretaceous extinctions {{ammonitina-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Pachyceratidae Pachyceratidae is a family of Perisphinctoidean ammonites from the upper Middle - and lower Upper Jurassic. Genera within the Pachyceratidae have shells that are in general moderately involte but with most of the inner whorls exposed; whorl sections subquadrate to subtrapezoidal, with rounded venter. Ribbing is strong, in some sharp. Primary ribs typically branch above mid flanks into twos, threes, and even fours. The Pachyceratidae, according to Donovan et al. (1981), were derived from the Perisphinctidae in the mid Callovian at about the same time as the longer lived Aspidoceratidae, lasting only into the subsequent Oxfordian. This differs from the perspective of Arkell, et al. (1957) in the Treatise wherein the Pachyceridae is included in the Stephanoceratoidea Stephanoceratoidea, formerly Stephanocerataceae, is a superfamily of middle- upper Jurassic ammonoid cephalopods within the order Ammonitida containing diverse forms, generally with sharp ribbing and complex sutu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Ataxioceratidae Ataxioceratidae is an extinct Ammonite cephalopod family included in the superfamily Perisphinctoidea. These fast-moving nektonic carnivores lived during the Jurassic and Cretaceous periods. Genera '' Catutosphinctes'' '' Choicensisphinctes'' '' Katroliceras'' ''Lithacoceras'' '' Lithacosphinctes'' '' Orthosphinctes'' Distribution Fossils of species within this genus have been found in the Cretaceous of Yemen, as well as in Jurassic The Jurassic ( ) is a Geological period, geologic period and System (stratigraphy), stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately Mya. The J ... sediments of Antarctica, Argentina, Canada, China, Cuba, France, Germany, Hungary, India, Iran, Italy, Madagascar, Nepal, Somalia, Spain, United States. References Ammonitida families Perisphinctoidea Jurassic ammonites Cretaceous ammonites Oxfordian first appearances Early Cretaceous ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Aspidoceratidae The Aspidoceratidae comprise a family of middle and upper Jurassic ammonites that make up part of the superfamily Perisphinctoidea, characterized by evolute shells, commonly stocky, that tend to develop tubercles. The Aspidoceratidae are thought to be derived from the Perisphinctidae and have been subdivided into three subfamilies, the Aspidoceratinae, Peltoceratinae, and Simoceratinae. Subfamilies and genera * Aspidoceratinae Zittel 1895 '' Aspidoceras'' '' Chinamecaceras'' Cantu-Chapa 2006 ''Epaspidoceras'' '' Euaspidoceras'' ** ''Orthaspidoceras'' * Peltoceratinae Spath 1924 ''Peltoceras'' '' Peltoceratoides'' ** ''Rursiceras'' * Simoceratinae The Simoceratinae is a subfamily in the Aspidoceratidae The Aspidoceratidae comprise a family of middle and upper Jurassic ammonites that make up part of the superfamily Perisphinctoidea, characterized by evolute shells, commonly stocky, tha ... '' Simoceras'' '' Virgatosimoceras'' References * Arkel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Reineckeiidae Reineckeiidae is an extinct ammonoid cephalopod family belonging to the superfamily Perisphinctoidea. These fast-moving nektonic carnivores lived during the Jurassic period, from the Callovian In the geologic timescale, the Callovian is an age and stage in the Middle Jurassic, lasting between 166.1 ± 4.0 Ma (million years ago) and 163.5 ± 4.0 Ma. It is the last stage of the Middle Jurassic, following the Bathonian and preceding the ... to the Oxfordian. References External links Ammonites Ammonitida families Perisphinctoidea Callovian first appearances Late Jurassic extinctions {{Ammonitina-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Olcostephanidae Olcostephanidae is an extinct ammonoid cephalopod family belonging to the superfamily Perisphinctoidea. These fast-moving nektonic carnivores lived from the Jurassic to the Cretaceous period. Genera '' Bihenduloceras'' '' Olcostephanus'' Neumayr, 1875 '' Saynoceras'' '' Subastieria'' Spath, 1923 '' Taraisites'' Canta-Chapa, 1966 '' Valanginites'' Sayn, 1910 Distribution Fossils of species within this genus have been found in the Cretaceous sediments of Antarctica, Argentina, Austria, Chile, Colombia, Czech Republic, Czechoslovakia, France, Hungary, Italy, Mexico, Morocco, Peru, Poland, Portugal, Romania, Slovakia, South Africa, Spain, Russia, United States, as well as in the Jurassic The Jurassic ( ) is a Geological period, geologic period and System (stratigraphy), stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately Mya. The J ... of Argentina and Mexico. References ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Craspeditidae ''Craspeditidae'' is an ammonoid cephalopod family included in the Perisphinctoidea superfamily. Some classifiers consider the Craspeditidae a subfamily in the Polyptychitidae. These ammonites lived during the Late Jurassic and Early 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 around 79 million years, it is the longest geological period of th .... Genera '' Craspedites'' † '' Platylenticeras'' † '' Tolypeceras'' † References Cretaceous ammonites Jurassic ammonites Perisphinctoidea Ammonitida families {{ammonitina-stub ... [...More Info...] [...Related Items...] OR:* [Wikipedia] [Google] [Baidu]
	Oosterellidae Oosterellidae is an extinct ammonoid cephalopod family belonging to the superfamily Perisphinctoidea. These fast-moving nektonic carnivores lived during the Cretaceous. Genera '' Oosterella'' '' Pseudoosterella'' Distribution Fossils of species within this genus have been found in the 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 around 79 million years, it is the longest geological period of th ... sediments of Argentina, Austria, Colombia, Czech Republic, France, Hungary, Italy, Mexico, Morocco, Romania and Slovakia. References Ammonitida families Perisphinctoidea Cretaceous ammonites Ammonites of Europe Early Cretaceous first appearances Early Cretaceous extinctions {{ammonitina-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]