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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] |
Mammites
''Mammites'' is a Late Cretaceous (Cenomanian to Turonian) ammonite genus included in the acanthoceratoidean family, Acanthoceratidae, and the type genus for the subfamily Mammitinae. ''Mammites'' was named by Laube and Bruder in 1887. Species Species within the genus ''Mammites'' include:''Mammites'' at .org * ''M. mohavanensis'' Böse, 1923 - found at Loma el Macho, Coahuila, Mexico * ''M. mutabilis'' Reyment, 1955 - known from Cameroon * ''M. nodosoides'' Schlüter, 1871 - found in North and South America, Africa and Europe * ''M. powelli'' Kennedy ''et al.'', 1987 - found in Texas and Colombia * ''M. rancheriae'' An ... [...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] |
Turonian
The Turonian is, in the ICS' geologic timescale, the second age in the Late Cretaceous Epoch, or a stage in the Upper Cretaceous Series. It spans the time between 93.9 ± 0.8 Ma and 89.8 ± 1 Ma (million years ago). The Turonian is preceded by the Cenomanian Stage and underlies the Coniacian Stage. At the beginning of the Turonian an oceanic anoxic event (OAE 2) took place, also referred to as the Cenomanian-Turonian boundary event or the "Bonarelli Event". Stratigraphic definition The Turonian (French: ''Turonien'') was defined by the French paleontologist Alcide d'Orbigny (1802–1857) in 1842. Orbigny named it after the French city of Tours in the region of Touraine (department Indre-et-Loire), which is the original type locality. The base of the Turonian Stage is defined as the place where the ammonite species '' Watinoceras devonense'' first appears in the stratigraphic column. The official reference profile (the GSSP) for the base of the Turonian is located in the Roc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pseudoaspidoceras
''Pseudoaspidoceras'' is an extinct genus of ammonites in the family Acanthoceratidae. These cephalopods lived during the Turonian stage of the Upper 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 ..., between 93.5 ± 0.8 Ma and 89.3 ± 1 Ma (million years ago). Their shells reached a diameter of 90–120 mm and had ornate ribs. Distribution Fossils of ''Pseudoaspidoceras'' have been found in Brazil, Nigeria and Peru.''Pseudoaspidoceras'' at Fossilworks.org References ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
