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Aspidoceratinae
The Aspidoceratinae is a subfamily in the perisphictacean ammonite family, Aspidoceratidae found world wide in middle and upper Jurassic sediments. Aspidoceratinae differ from Peltoceratinae in that the early biplicate ribbed stage is lacking, or greatly reduced, and no forms with lappets are known. Aptycus are bivalved and very durable, and in the "lower Kimmeridgian form Aptychus beds, containing few or no ammonites". (Kimmeridgian is middle Upper Jurassic, follows the Oxfordian and predates the Tithonian). The earliest Aspidoceratinae occur with the first Peltoceratinae, and likewise are probably derived from within the Perisphinctidae Perisphinctidae is a family of Middle and Upper Jurassic discoidal ammonites in the order Ammonitida. They have a shell morphology that is mostly evolute, typically with biplicate, simple, or triplicate ribbing. Large forms have simple aperture ... References ;Notes ;Bibliography * Arkell, et al., 1957. Mesozoic Ammonoidea. Treatise on ... [...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] |
Aspidoceras
''Aspidoceras'' is an extinct ammonoid cephalopod genus belonging to the family Aspidoceratidae. Taxonomy ''Aspidoceras'', named by Zittel, 1868, is the type genus for the persphictacian family Aspidoceratidae and subfamily Aspidoceratinae in which it is included. It is considered related to genera like '' Chinamecaceras'', '' Cubaspidoceras'', '' Euaspidoceras'', '' Extranodites'', '' Intranodites'', '' Neaspidoceras'', '' Oligopsychopsis'', ''Orthaspidoceras'', '' Schaireria'' and '' Simaspidoceras''. Selected species *† ''Aspidoceras argobbae'' Dacque 1905 *†'' Aspidoceras catalaunicum'' Loriol 1872 *† ''Aspidoceras somalicum'' Dacque 1905 *†'' Aspidoceras supraspinosum'' Dacque 1905 Fossil record ''Aspidoceras'' mainly lived during the Late Jurassic ( Oxfordian) until Cretaceous (Berriasian), with a fairly broad distribution. Fossils have been found in Italy, Chile, Spain, Algeria, Antarctica, Argentina, Ethiopia, France, Germany, Hungary, India, Iran, Madagascar, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |