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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] |
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, 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 s ... stage of the Upper Cretaceous. Shells are generally rapidly expanding with prominent, wide spaced, straight radial ribs that cross over the arched venter without interruption. Although somewhat similar in appearance to ''Calycoceras'', ''Conlinoceras'' differs in having sparser, more widely spaced ribs. The first (lowest) appearance of ''Conlinoceras tarrantense'', which can reach a diameter of 12.5 cm ( 4.9 in), marks the base of the middle Cenomanian in Texas. References * ''Conlinoceras'' iAcanthocer ... [...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] |
Quitmaniceras
''Quitmaniceras'' is a genus of small, compressed, fairly evolute ammonites from the lower Turonian of Grant County, New Mexico and Trans-Pecos Texas, included in the subfamily Acanthoceratinae. The shell has a carinate venter in juveniles and one that is arched in adults, usually with a raised siphonal line,(siphonal referring to the marginal siphuncle). Ribs are very weak to moderately strong, flexious, typically sloping forward toward the rim, bending further forward at the outer shoulder. Distribution Fossils of ''Quitmaniceras'' have been found in Colombia (Loma Gorda Formation, Aipe, Huila),Patarroyo, 2011, p.69 Mexico and the United States (Arizona and Texas).''Quitmaniceras'' at |
Albert De Grossouvre
Marie Félix Albert Durand de Grossouvre (23 August 1849, Bourges – 18 May 1932, Bourges) was a French geologist, best known for his research in the fields of stratigraphy and paleontology. Biography He studied at the École Polytechnique and the École des Mines de Paris, and afterwards worked as a mining engineer in his hometown of Bourges. In 1889 he attained the post of chief mining engineer. He conducted stratigraphic investigations throughout France, and in the process, uncovered numerous fossils, most notably ammonites. As a cartographer, he participated in the creation of geological maps of central France (Issoudun, Châteauroux, Valençay).Sociétés savantes de France biography in French at Annal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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. algeriense'' Kennedy & Gale, 2017 *''C. annulatum'' Collignon, 1964 *''C. asiaticum'' (Jimbo, 1894)William James Kennedy, Herbert Christian Klinger (2010Cretaceous faunas from Zululand and Natal, South Africa. The ammonite subfamily Acanthoceratinae de Grossouvre, 1894/ref> **''C. a. asiaticum'' (Jimbo, 1894) **''C. a. spinosum'' (Kossmat, 1897) *''C. besairieri'' Collignon, 1937 *''C. boreale'' Kennedy, Cobban & Landman, 1996 *''C. dromense'' (Thomel, 1972) *''C. cenomanense'' (d’Archiac, 1846) *''C. navicularis'' Mantell, 1822 *''C. orientale'' Matsumoto, Saito & Fukada *''C. paucinodatum'' (Crick) *''C. tarrantense'' Distribution ''Calycoceras'' species may be found in the Cretaceous of Angola, Antarctica, Canada (British Columbia), Fra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acanthoceras (ammonite)
''Acanthoceras'' is an extinct cephalopod genus belonging to the subclass Ammonoidea and family Acanthoceratidae that lived from the Albian to early Coniacian stages of the Cretaceous.''Acanthoceras'' at .org Description Their shells had ornate ribs whose function is unknown, although some scientists have speculated that these ribs helped strengthen the animals' shells to allow them to live at greater depths where the water pressure is higher. An adult had a shell diameter of approximately .Species * ''A. athabascense'' Warren and Stelck, 1955 * ''A. chasca'' Benavides-Caceres, 1956 * ''A. compital ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
