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Khorotherium
''Khorotherium'' is a genus of extinct mammaliaforms. The type and only species, ''Khorotherium yakutensis'', is known from the Lower Cretaceous Batylykh Formation in Western Yakutia, Russia. It belongs to the family Tegotheriidae from the order Docodonta, alongside ''Sibirotherium ''Sibirotherium'' is an extinct genus of docodont mammaliaform. It is known from only a single named species, ''Sibirotherium rossicum'', known from jaw fragments and teeth found in the Early Cretaceous (Aptian) aged Ilek Formation The Ilek F ...'' from the same region, it is amongst the youngest known docodonts.A. Averianov, T. Martin, A. Lopatin, P. Skutschas, R. Schellhorn, P. Kolosov, and D. Vitenko. 2018. A high-latitude fauna of mid-Mesozoic mammals from Yakutia, Russia. ''PLoS ONE'' 13(7):e0199983:1-17 Phylogeny References Docodonts Prehistoric therapsid genera Fossil taxa described in 2018 {{Paleo-therapsid-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tegotheriidae
Docodonta is an order of extinct mammaliaforms that lived during the Mesozoic, from the Middle Jurassic to Early Cretaceous. They are distinguished from other early mammaliaforms by their relatively complex molar teeth, from which the order gets its name. Until recently, Docodonta were represented primarily by teeth and jaws found across former Laurasia, (modern-day North America, Europe, and Asia). However, recent discoveries in China include some exceptionally well preserved, almost complete body fossils. Description Skeletal traits Docodonts have a long and low mandible (lower jaw), formed primarily by the tooth-bearing dentary bone. The dentary connects to the cranium via a joint with the squamosal, a connection which is strengthened relative to earlier mammaliaforms. The other bones in the jaw, known as postdentary elements, are still connected to the dentary and lie within a groove (the postdentary trough) in the rear part of the dentary’s inner edge. Nevertheless, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Docodontidae
Docodonta is an order of extinct mammaliaforms that lived during the Mesozoic, from the Middle Jurassic to Early Cretaceous. They are distinguished from other early mammaliaforms by their relatively complex molar teeth, from which the order gets its name. Until recently, Docodonta were represented primarily by teeth and jaws found across former Laurasia, (modern-day North America, Europe, and Asia). However, recent discoveries in China include some exceptionally well preserved, almost complete body fossils. Description Skeletal traits Docodonts have a long and low mandible (lower jaw), formed primarily by the tooth-bearing dentary bone. The dentary connects to the cranium via a joint with the squamosal, a connection which is strengthened relative to earlier mammaliaforms. The other bones in the jaw, known as postdentary elements, are still connected to the dentary and lie within a groove (the postdentary trough) in the rear part of the dentary’s inner edge. Nevertheles ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sibirotherium
''Sibirotherium'' is an extinct genus of docodont mammaliaform. It is known from only a single named species, ''Sibirotherium rossicum'', known from jaw fragments and teeth found in the Early Cretaceous (Aptian) aged Ilek Formation in western Siberia, alongside ''Khorotherium ''Khorotherium'' is a genus of extinct mammaliaforms. The type and only species, ''Khorotherium yakutensis'', is known from the Lower Cretaceous Batylykh Formation in Western Yakutia, Russia. It belongs to the family Tegotheriidae from the or ...'' also from Siberia, it is one of the youngest docodonts. References {{Reflist Docodonts Prehistoric cynodont genera ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Batylykh Formation
The Batylykh Formation is a geological formation in Yakutia, Russia. It is of an uncertain Early Cretaceous age, probably dating between the Berriasian and the Barremian. It is the oldest unit of the thick Sangar Series within the Vilyuy syneclise. The mudstones, sandstones and shales of the formation were deposited in a fluvial to lacustrine environment. Fossil content The formation is best known for the Teete locality, which has revealed remains of numerous vertebrates, including sauropods,Averianov et al., 2019 and other dinosaur teeth as well as numerous species of mammal, including '' Sangarotherium'', ''Khorotherium''Averianov et al., 2018 and tritylodontid ''XenocretosuchusLopatin & Agadjanian, 2008''. as well as choristodere ''Khurendukhosaurus''.Kolosov et al., 2009 Other fossils recovered from the formation are: [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Docodon
''Docodon'' (meaning 'beam tooth') was a mammaliaform from the Late Jurassic of western North America. It was the first docodontan cynodont to be named. Description ''Docodon'' was the first docodontan cynodont found and named, and later gave its name to the family Docodontidae as well as the order Docodonta.Kretzoi, M. (1946). "On Docodonta, a new order of Jurassic Mammals". ''Anneles Historico-Naturales Musei Nationalis Hungarici''. 39 :108-111. Docodonts had more complex shaped teeth than other early non-mammalian mammaliaforms, with piercing and crushing surfaces that would have allowed members of this family to eat a wider range of food types. These complex teeth are more similar to those of later mammal groups, but evolved independently of them. Unlike many of its coexisting mammal relatives from the Mesozoic, ''Docodon'' is known from a large number of teeth and jaws of differing growth stages. This has made it possible to study the growth of this docodontan, and has re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Haldanodon
''Haldanodon'' is an extinct docodont mammaliaform which lived in the Upper Jurassic (Kimmeridgian, about 145 million years ago). Its fossil remains have been found in Portugal, in the well-known fossil locality of Guimarota, which is in the Alcobaça Formation. It may have been a semi-aquatic burrowing insectivore, similar in habits to desmans and the platypus. Several specimens are known, include a partial skeleton and well-preserved skulls. Description ''Haldanodon'' was about as long as a desman, and may have had a similar ecology. The skull was low and triangular when seen from above. For many years it had the best-known skull material of any docodont, making it vital for understanding the taxonomic position of that mammaliaform group. It was the first Mesozoic mammaliaform discovered to possess turbinal plates, a complex feature of mammalian nasal cavities. However, it also retained some curiously primitive traits in common with non-mammaliaform cynodonts. The body wa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nomenclature, the genus name forms the first part of the binomial species name for each species within the genus. :E.g. '' Panthera leo'' (lion) and '' Panthera onca'' (jaguar) are two species within the genus ''Panthera''. ''Panthera'' is a genus within the family Felidae. The composition of a genus is determined by taxonomists. The standards for genus classification are not strictly codified, so different authorities often produce different classifications for genera. There are some general practices used, however, including the idea that a newly defined genus should fulfill these three criteria to be descriptively useful: # monophyly – all descendants of an ancestral taxon are grouped together (i.e. phylogenetic analysis should c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
