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Arctoptychites
''Arctoptychites'' is a genus of extinct cephalopods belonging to the ceratitid family Ptychitidae, and related to such genera as ''Ptychites ''Ptychites'' is an extinct genus of cephalopods belonging to the family Ptychitidae. These nektonic carnivores lived during the Triassic period, from Anisian to Ladinian age. Species * ''Ptychites besnosovi'' Shevyrev 1995 * ''Ptychites densist ...'' and '' Aristoptychites''; all from the Triassic. The Ptychitidae, to which ''Arctoptychites'' belongs, is a family of ceratitid ammonites (''sensu lato'') with ammonitic sutures and variably subglobular to compressed, ribbed or smooth, generally evolute shells.Treatise on Invertebrate Paleontology, Part L (1957),Mesozoic Ammonoidea p.L180. References Ptychitaceae Ceratitida genera Triassic ammonites Fossils of Svalbard {{Svalbard-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Triassic
The Triassic ( ) is a geologic period and system which spans 50.6 million years from the end of the Permian Period 251.902 million years ago ( Mya), to the beginning of the Jurassic Period 201.36 Mya. The Triassic is the first and shortest period of the Mesozoic Era. Both the start and end of the period are marked by major extinction events. The Triassic Period is subdivided into three epochs: Early Triassic, Middle Triassic and Late Triassic. The Triassic began in the wake of the Permian–Triassic extinction event, which left the Earth's biosphere impoverished; it was well into the middle of the Triassic before life recovered its former diversity. Three categories of organisms can be distinguished in the Triassic record: survivors from the extinction event, new groups that flourished briefly, and other new groups that went on to dominate the Mesozoic Era. Reptiles, especially archosaurs, were the chief terrestrial vertebrates during this time. A specialized subgroup of archo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ceratitida
Ceratitida is an order that contains almost all ammonoid cephalopod genera from the Triassic as well as ancestral forms from the Upper Permian, the exception being the phylloceratids which gave rise to the great diversity of post Triassic ammonites. Ceratitids overwhelmingly produced planospirally coiled discoidal shells that may be evolute with inner whorls exposed or involute with only the outer whorl showing. In a few later forms the shell became subglobular, in others, trochoidal or uncoiled. Sutures are typically ceratitic, with smooth saddles and serrate or digitized lobes. In a few the sutures are goniatitic while in others they are ammonitic. Taxonomy * Ceratitida **Ceratitoidea ** Choristoceratoidea **Clydonitoidea **Danubitoidea **Dinaritoidea ** Lobitoidea ** Meekoceratoidea ** Megaphyllitoidea ** Nathorstitoidea **Noritoidea ** Otoceratoidea ** Pinacoceratoidea **Ptychitoidea ** Sageceratoidea **Tropitoidea ** Xenodiscoidea Only eight superfamilies are sho ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ptychites
''Ptychites'' is an extinct genus of cephalopods belonging to the family Ptychitidae. These nektonic carnivores lived during the Triassic period, from Anisian to Ladinian age. Species * ''Ptychites besnosovi'' Shevyrev 1995 * ''Ptychites densistriatus'' Bucher 1992 * ''Ptychites domatus'' Silberling and Tozer 1968 * ''Ptychites evansi'' Smith 1914 * ''Ptychites gradinarui'' Bucher 1992 * ''Ptychites guloensis'' Tozer 1994 * ''Ptychites hamatus'' Tozer 1994 * ''Ptychites miyagiensis'' Bando 1964 * ''Ptychites nipponicus'' Bando 1964 * ''Ptychites oppeli'' Mojsisovic 1882 * ''Ptychites opulentus'' Mojsisovics 1882 * ''Ptychites pseudoeuglyphus'' Konstantinov 1991 * ''Ptychites stachei'' Mojsisovics 1882 * ''Ptychites trochleaeformis'' Lindstroem 1865 * ''Ptychites wrighti'' McLearn 1946 Description Species in this genus are quite variable in form, ranging from subglobose to laterally compressed. The surface of the shell is sculptured with low folds. Distribution Fossils of specie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aristoptychites
''Aristoptychites'' is an extinct genus of cephalopod from the Anisian stage of the Middle Triassic belonging to the ammonoid Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid and cuttlefish) ... subclass. Shell involute, whorls strongly embraced, venter acutely rounded. Suture curved, subammonitic; more closely resembles that of '' Flexoptychites'' or '' Discoptychites'' than of other ptychitids. References * ''Aristoptychites''Paleobiology Database, 6/8/12 Ptychitaceae Fossils of Svalbard Ceratitida genera Triassic ammonites Anisian life {{Svalbard-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ptychitaceae
Ptychitoidea, formerly Ptychitacheae, is a superfamily of typically involute, subglobular to discoidal Ceratitida in which the shell is smooth with lateral folds or striations, inner whorls are globose, and the suture is commonly ammonitic. Their range is Middle_ and Upper Triassic. In its present configuration the Ptychitoidea includes three families, the: * Ptychitidae * Eosagenitidae * Sturiidae This differs from the taxonomy in the ''Treatise on Invertebrate Paleontology'', Part L, in which the Ptychitoidea included the *Ptychitidae * Isculitidae * Nannititdae The Isculitidae have since been removed to the Pinacocerataceae and the Nannitidae to the Danubitaceae The Danubitoidea is a large and diverse superfamily in the order Ceratitida of the Ammonoidea that combines five families removed from the Ceratitaceae, Clydonitaceae, and Ptychitaceae Ptychitoidea, formerly Ptychitacheae, is a superfamily of .... Fossils of Ptychitoidea have been found in the Triassic of Cal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ceratitida Genera
Ceratitida is an order that contains almost all ammonoid cephalopod genera from the Triassic as well as ancestral forms from the Upper Permian, the exception being the phylloceratids which gave rise to the great diversity of post Triassic ammonites. Ceratitids overwhelmingly produced planospirally coiled discoidal shells that may be evolute with inner whorls exposed or involute with only the outer whorl showing. In a few later forms the shell became subglobular, in others, trochoidal or uncoiled. Sutures are typically ceratitic, with smooth saddles and serrate or digitized lobes. In a few the sutures are goniatitic while in others they are ammonitic. Taxonomy * Ceratitida **Ceratitoidea **Choristoceratoidea **Clydonitoidea **Danubitoidea **Dinaritoidea ** Lobitoidea ** Meekoceratoidea ** Megaphyllitoidea ** Nathorstitoidea **Noritoidea **Otoceratoidea **Pinacoceratoidea **Ptychitoidea ** Sageceratoidea **Tropitoidea **Xenodiscoidea Only eight superfamilies are shown i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Triassic Ammonites
The Triassic ( ) is a geologic period and system which spans 50.6 million years from the end of the Permian Period 251.902 million years ago ( Mya), to the beginning of the Jurassic Period 201.36 Mya. The Triassic is the first and shortest period of the Mesozoic Era. Both the start and end of the period are marked by major extinction events. The Triassic Period is subdivided into three epochs: Early Triassic, Middle Triassic and Late Triassic. The Triassic began in the wake of the Permian–Triassic extinction event, which left the Earth's biosphere impoverished; it was well into the middle of the Triassic before life recovered its former diversity. Three categories of organisms can be distinguished in the Triassic record: survivors from the extinction event, new groups that flourished briefly, and other new groups that went on to dominate the Mesozoic Era. Reptiles, especially archosaurs, were the chief terrestrial vertebrates during this time. A specialized subgroup of archosaurs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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