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Alloceratites
''Alloceratites'' is a genus of ammonoid cephalopods from the Middle Triassic of Germany included in the family Ceratitidae ''Ceratitidae'' is an extinct family of ammonite cephalopods. Fossils of ''Ceratitidae'' are found in the Triassic marine strata throughout the world, including Asia, Europe, the Middle East, North America, and Oceania. Selected genera Subfam .... The mature shell of ''Alloceratites'' has strong, well spaced lateral tubercles and clavi (nodes) along either side of the venter. Ribbing between tubercles is indistinct. The suture is ceratitic. References * Arkell, et al. 1957. Mesozoic Ammonoidea; Treatise on Invertebrate Paleontology. Geol. Soc. of America and Univ. Kans. Press. Ceratitidae Ceratitida genera Middle Triassic ammonites Triassic ammonites of Europe {{Ceratitida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ceratitidae
''Ceratitidae'' is an extinct family of ammonite cephalopods. Fossils of ''Ceratitidae'' are found in the Triassic marine strata throughout the world, including Asia, Europe, the Middle East, North America, and Oceania. Selected genera Subfamily Ceratitinae Mojsisovics 1879 * '' Acanthoceratites'' Schrammen 1928 * '' Alloceratites'' Spath 1934 * ''Ceratites ''Ceratites'' is an extinct genus of ammonite cephalopods. These nektonic carnivores lived in marine habitats in what is now Europe, during the Triassic, from the upper-most Anisian to the lower Ladinian The Ladinian is a stage and age in the ...'' de Haan 1825 * '' Eogymnotoceras'' Bucher 1988 * '' Latemarites'' Brack and Rieber 1993 Subfamily Nevaditinae Tozer 1994 * '' Alkaites'' Balini et al. 2006 * '' Chieseiceras'' Brack and Rieber 1986 * '' Detoniceras'' Manfrin and Mietto 1991 * '' Nevadites'' Smith 1914 * '' Paranevadites'' Tozer 1994 * '' Xenoprotrachyc'' Subfamily Paraceratitinae Silberling 1962 * '' Br ... [...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] |
Ammonoidea
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) than they are to shelled nautiloids such as the living ''Nautilus'' species. The earliest ammonites appeared during the Devonian, with the last species vanishing during the Cretaceous–Paleogene extinction event. Ammonites are excellent index fossils, and linking the rock layer in which a particular species or genus is found to specific geologic time periods is often possible. Their fossil shells usually take the form of planispirals, although some helically spiraled and nonspiraled forms (known as heteromorphs) have been found. The name "ammonite", from which the scientific term is derived, was inspired by the spiral shape of their fossilized shells, which somewhat resemble tightly coiled rams' horns. Pliny the Elder ( 79 AD nea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Middle Triassic
In the geologic timescale, the Middle Triassic is the second of three epochs of the Triassic period or the middle of three series in which the Triassic system is divided in chronostratigraphy. The Middle Triassic spans the time between Ma and Ma (million years ago). It is preceded by the Early Triassic Epoch and followed by the Late Triassic Epoch. The Middle Triassic is divided into the Anisian and Ladinian ages or stages. Formerly the middle series in the Triassic was also known as Muschelkalk. This name is now only used for a specific unit of rock strata with approximately Middle Triassic age, found in western Europe. Middle Triassic fauna Following the Permian–Triassic extinction event, the most devastating of all mass-extinctions, life recovered slowly. In the Middle Triassic, many groups of organisms reached higher diversity again, such as the marine reptiles (e.g. ichthyosaurs, sauropterygians, thallatosaurs), ray-finned fish and many invertebrate groups like ... [...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] |
Middle Triassic Ammonites
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