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Euomphaloceratinae
Euomphaloceratinae is a subfamily of Upper Cretaceous ammonites included in the Acanthoceratidae, characterized by generally evolute shells with quadrate whorl sections that are strongly ribbed. Sutures are ammonitic, but not overly complex. Genera include: *'' Burroceras'' *''Codazziceras'' *'' Euomphaloceras'', (type genus) *'' Hourcqiceras'' *'' Kamerunoceras'' *'' Lotzeites'' *''Morrowites'' *'' Paraburroceras'' *'' Paramammites'' *'' Pseudaspidoceras'' *'' Romaniceras'' *'' Shuparoceras'' some of which have been removed from other taxa where originally placed. ''Euomphaloceras'', the type genus of the subfamily, was removed from the Acanthoceratinae sensu Arkell et al. 1957, ''Kamarunoceras'' and ''Pseuaspidoceras'' from the Mammitinae, sensu Arkell et al. 1957. Others were added since initial publication of the Treatise on Invertebrate Paleontology The ''Treatise on Invertebrate Paleontology'' (or ''TIP'') published by the Geological Society of America and the Univers ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acanthoceratidae
Acanthoceratidae is an extinct family of acanthoceratoid cephalopods in the order Ammonitida, known from the Upper Cretaceous. The type genus is '' Acanthoceras''. Diagnosis Acanthoceratidae species are strongly tuberculate with at least umbilical and ventrolateral tubercles in most genera included. Ribs are dominant in some, in others weak or absent on the outer whorls. Most are evolute, compressed to very depressed in section. Sutures are ammonitic with little variation, but showing a tendency for simplication in later genera. Taxonomy Acanthoceratidae de Grossouvre, 1894 includes the following subfamilies. *Acanthoceratinae de Groussouvre, 1894 * Euomphaloceratinae Cooper, 1978 *Mammitinae Mammitinae comprises a subfamily within the Acanthoceratidae (Ammonoidea) characterized by moderately to very evolute shells with rectangular to squarish whorl sections along with blunt umbilical and prominent inner and outer ventrolateral tuberc ... (Hyatt, 1900) (= Fallotitinae Wie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Codazziceras
''Codazziceras'' is an early Late Cretaceous ammonite from the Late Cretaceous of Colombia, distinguished from '' Lyelliceras'' (Lyelliceratidae) from which it is based and added to the Euomphaloceratinae (Acanthoceratidae). The type species is ''Codazziceras scheibei'' and another described species is ''C. ospinae''.''Codazziceras'' at .org of ''Codazziceras'' have been found in the of Huila, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Euomphaloceras
''Euomphaloceras'' is an early Upper Cretaceous ammonite genus, (Cephalopoda, Ammonoidea), included in the Acanthoceratinae until established as the type genus for the Euomphaloceratinae Euomphaloceratinae is a subfamily of Upper Cretaceous ammonites included in the Acanthoceratidae, characterized by generally evolute shells with quadrate whorl sections that are strongly ribbed. Sutures are ammonitic, but not overly complex. Gen ... by Cooper, 1978. The shell is very evolute, all whorls exposed, and rather depressed, with prominent umbilical and ventrolateral tubercles on some or all main ribs. The Venter broad and flat with three rows of tubercles that are more numerous than the ventrolateral ones. May have shallow ventral constrictions. Derivation is from an evolute '' Acathoceras''. References * W.J. Arkell ''et al.'', 1957. Mesozoic Ammonoidea; Treatise on Invertebrate Paleontology,Part L, Mollusca 4. Geological Society of America and University of Kansas Press. A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kamerunoceras
''Kamerunoceras'' is an extinct cephalopod genus belonging to the ammonite family Acanthoceratidae, found in Upper Cretaceous formations (Cenomanian to Turonian age) of Africa, Europe and North and South America. Description ''Kamerunoceras'', named by R.A. Reyment in 1954, was tentatively included in the acanthoceratid subfamily Mammitinae in W.J. Arkell, ''et al'' (1957), but has since been combined with ''Euomphaloceras'', previously of the Acanthoceratinae ''ibid'', in the Euomphaloceratinae.Cooper, 1978 ''Kamerunoceras'' is described as being very evolute with a rectangular whorl section and umbilical tubercles only in the middle growth section. Ventrolateral tubercles, found mostly throughout, are spinose. Ribs are irregular, straight at first, becoming denser and sigmoid on the outer whorl.Arkell, 1957 Species The following species of ''Kamerunoceras'' have been described: * ''K. andinum'' Renz, 1982 * ''K. antsaronense'' Collignon, 1965 * ''K. calvertense'' Powell, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Romaniceras
''Romaniceras'' is a genus of Upper Cretaceous ammonites in the Acanthoceratidae subfamily Euomphaloceratinae Euomphaloceratinae is a subfamily of Upper Cretaceous ammonites included in the Acanthoceratidae, characterized by generally evolute shells with quadrate whorl sections that are strongly ribbed. Sutures are ammonitic, but not overly complex. Gen .... The shell is rather evolute, whorl section circular to oval and ''Romaniceras'' differs from '' Acanthoceras'' in having 9 or 11 rows of tubercles, of which the ventrolateral may be clavate (i.e. elongate). The ribs of ''Romaniceras'' specimens are strong and fairly close spaced.W.J. Arkell ''et al.'', 1957. Mesozoic Ammonoidea; Treatise on Invertebrate Paleontology, Part L, Mollusca 4. Geological Society of America and University of Kansas Press.Spath, 1923 References Cretaceous ammonites Acanthoceratidae Ammonitida genera Ammonites of Europe Cenomanian genus first appearances Turonian genus extinctions ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cenomanian
The Cenomanian is, in the ICS' geological timescale, the oldest or earliest age of the Late Cretaceous Epoch or the lowest stage of the Upper Cretaceous Series. An age is a unit of geochronology; it is a unit of time; the stage is a unit in the stratigraphic column deposited during the corresponding age. Both age and stage bear the same name. As a unit of geologic time measure, the Cenomanian Age spans the time between 100.5 and 93.9 million years ago (Mya). In the geologic timescale, it is preceded by the Albian and is followed by the Turonian. The Upper Cenomanian starts around at 95 Mya. The Cenomanian is coeval with the Woodbinian of the regional timescale of the Gulf of Mexico and the early part of the Eaglefordian of the regional timescale of the East Coast of the United States. At the end of the Cenomanian, an anoxic event took place, called the Cenomanian-Turonian boundary event or the "Bonarelli event", that is associated with a minor extinction event for marine spec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cenomanian First Appearances
The Cenomanian is, in the ICS' geological timescale, the oldest or earliest age of the Late Cretaceous Epoch or the lowest stage of the Upper Cretaceous Series. An age is a unit of geochronology; it is a unit of time; the stage is a unit in the stratigraphic column deposited during the corresponding age. Both age and stage bear the same name. As a unit of geologic time measure, the Cenomanian Age spans the time between 100.5 and 93.9 million years ago (Mya). In the geologic timescale, it is preceded by the Albian and is followed by the Turonian. The Upper Cenomanian starts around at 95 Mya. The Cenomanian is coeval with the Woodbinian of the regional timescale of the Gulf of Mexico and the early part of the Eaglefordian of the regional timescale of the East Coast of the United States. At the end of the Cenomanian, an anoxic event took place, called the Cenomanian-Turonian boundary event or the "Bonarelli event", that is associated with a minor extinction event for marine spec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 covering every phylum, class, order, family, and genus of fossil and extant (still living) invertebrate animals. The prehistoric invertebrates are described as to their taxonomy, morphology, paleoecology, stratigraphic and paleogeographic range. However, taxa with no fossil record whatsoever have just a very brief listing. Publication of the decades-long ''Treatise on Invertebrate Paleontology'' is a work-in-progress; and therefore it is not yet complete: For example, there is no volume yet published regarding the post-Paleozoic era caenogastropods (a molluscan group including the whelk and Common periwinkle, periwinkle). Furthermore, every so often, previously published volumes of the ''Treatise'' are revised. Evolution of the proje ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mammitinae
Mammitinae comprises a subfamily within the Acanthoceratidae (Ammonoidea) characterized by moderately to very evolute shells with rectangular to squarish whorl sections along with blunt umbilical and prominent inner and outer ventrolateral tubercles on sparse ribs that may be round and strong, sharp and narrow, or absent. The suture is somewhat simpler than that of the Acanthoceratinae. Range is restricted to the lower Turonian stage of the Upper Cretaceous. Genera include: *'' Buccinammonites'' *'' Buchiceras'' *'' Cryptometoicoceras'' *'' Dunverganoceras'' Warren & Stelck, 1940 *''Mammites'' Laube & Bruden, 1886 *'' Metasigaloceras'' Hyatt, 1903 *''Metoicoceras'' Hyatt, 1903 *'' Mitonia'' *'' Nannometoicoceras'' *'' Parabuchiceras'' *'' Paracompsoceras'' *'' Plesiacanthoceras'' *'' Praemetoicoceras'' *''Pseudoaspidoceras ''Pseudoaspidoceras'' is an extinct genus of ammonites in the family Acanthoceratidae. These cephalopods lived during the Turonian stage of the Upper Cre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acanthoceratinae
The Acanthoceratinae comprise a subfamily of ammonoid cephalopods that lived during the Late Cretaceous from the latter early Cenomanian to the late Turonian Shells are evolute, tuberculate and ribbed, with subquadrate to squarish whorl section wherein tubercles typically dominate over ribs. Derivation is from the Mantellicertinae in the early Cenomanian. Gave rise through '' Neocardioceras'' to the Mammitinae. Genera The following genera are included in the Acanthoceratinae according to various sources as indicated. *'' Acanthoceras'' Neumayer, 1875 *''Acompsoceras'' Hyatt, 1903 *'' Alzadites'' *'' Benueites'' Reyment, 1954 *'' Calycoceras'' Hyatt, 1900 *'' Conlinoceras'' Cobban & Scott, 1972 *'' Cunningtoniceras'' Collignon, 1937 *'' Eucalycoceras'' Spath, 1923 *'' Hypacanthohoplites'' Spath, 1923 *'' Kastanoceras'' *'' Kennediella'' *'' Microsulcatoceras'' *'' Nebraskites'' Kennedy & Cobban, 1988 *'' Neocardioceras'' Spath, 1926 *'' Nigericeras'' Schneegan, 1943 *'' Par ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |