|
Eoalligator
''Eoalligator'' is an extinct genus of alligatoroid crocodilian from Paleocene deposits in China. Systematics ''Eoalligator'' was originally classified as an extinct relative of alligators. The holotype of ''E. chunyii'', IVPP V2716, is a partial skeleton. A second nominal species, ''E. huiningensis'', was described in 1982 from Anhui.Young CC. 1982. A Cenozoic crocodile from Huaining, Anhui. Selected Works of Yang Zhongjian. China: Academia Sinica. 47-48. A 2016 study of Chinese alligators by Wang ''et al.'' found ''Eoalligator chunyii'' to be a junior synonym of '' Asiatosuchus nanlingensis'' and a basal member of Crocodylidae. However, a subsequent study by Wu ''et al.'' disagreed with the synonymy of ''"Asiatosuchus" nanlingensis'' and ''Eoalligator chunyii'', finding them to be distinct based on first-hand studies of the holotypes and cladistic analysis, although they agreed in classifying ''E. chunyii'' as a crocodyloid. In 2016, Wang ''et al.'' also found ''Eoalligator hu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Protoalligator
''Protoalligator'' is an extinct genus of alligatoroid crocodilian found in the Anhui province of China and lived during the Paleocene. Taxonomy ''P. huiningensis'', was originally named ''Eoalligator huiningensis'', which therefore remains the type species of the genus.Young CC. 1982. A Cenozoic crocodile from Huaining, Anhui. Selected Works of Yang Zhongjian. China: Academia Sinica. 47-48 But then a 2016 study of Chinese alligators by Wang ''et al.'' found the type species '' Eoalligator chunyii'' to be a junior synonym of '' Asiatosuchus nanlingensis'' and a basal member of Crocodylidae. However, a subsequent study by Wu ''et al.'' disagreed with the synonymy of ''"Asiatosuchus" nanlingensis'' and ''Eoalligator chunyii'', finding them to be distinct based on first-hand studies of the holotypes and cladistic analysis, although they agreed in classifying ''E. chunyii'' as a crocodyloid. In 2016, Wang ''et al.'' also found ''Eoalligator huiningensis'' to be an alligatoroid dist ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asiatosuchus Nanlingensis
''Asiatosuchus'' is an extinct genus of crocodyloid crocodilians that lived in Eurasia during the Paleogene. Many Paleogene crocodilians from Europe and Asia have been attributed to ''Asiatosuchus'' since the genus was named in 1940. These species have a generalized crocodilian morphology typified by flat, triangular skulls. The feature that traditionally united these species under the genus ''Asiatosuchus'' is a broad connection or symphysis between the two halves of the lower jaw. Recent studies of the evolutionary relationships of early crocodilians along with closer examinations of the morphology of fossil specimens suggest that only the first named species of ''Asiatosuchus'', ''A. grangeri'' from the Eocene of Mongolia, belongs in the genus. Most species are now regarded as ''nomina dubia'' or "dubious names", meaning that their type specimens lack the unique anatomical features necessary to justify their classification as distinct species. Other species such as ''"A." german ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Orientalosuchina
Orientalosuchina is an extinct clade of alligatoroid crocodylians from South and East Asia that lived during the Paleocene and Eocene. The clade was named as the result of a 2019 study by Massonne ''et al.'' that included several extinct alligatoroid taxa from Asia and found that they were all closely related and together formed a monophyletic clade as basal members of Alligatoroidea, as shown in the cladogram below: Some studies have disputed this placement of ''Jiangxisuchus'' within Orientalosuchina as an alligatoroid, instead recovering ''Jiangxisuchus'' as a basal member of Crocodyloidea Crocodyloidea is one of three superfamilies of crocodilians, the other two being Alligatoroidea and Gavialoidea, and it includes the crocodiles. Crocodyloidea may also include the extinct Mekosuchinae, native to Australasia from the Eocene to th .... References Crocodilians Paleocene reptiles of Asia Paleocene crocodylomorphs {{paleo-archosaur-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brachychampsa Montana
''Brachychampsa'' is an extinct genus of alligatoroid, possibly a basal caiman. Specimens have been reported from New Mexico, Colorado, Wyoming, Montana, North and South Dakota, New Jersey, and Saskatchewan, though only those from Montana, Utah, and New Mexico are based on material sufficient to justify the referral. One specimen has been reported from the Darbasa Formation of Kazakhstan, although the species status is indeterminate for the fossil. The genus first appeared during the late Campanian stage of the Late Cretaceous (Judithian North American stage) and became extinct during the late Maastrichtian stage of the Cretaceous (Lancian North American Land Mammal "Age"). ''Brachychampsa'' is distinguished by an enlarged fifth maxillary tooth in the upper jaw. Species The type species of ''Brachychampsa'' is ''B. montana'', first discovered from the Hell Creek Formation of Montana and described by Charles W. Gilmore in a paper in 1911. In that same paper, Gilmore recombine ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brachychampsa Sealeyi
''Brachychampsa'' is an extinct genus of alligatoroid, possibly a basal caiman. Specimens have been reported from New Mexico, Colorado, Wyoming, Montana, North and South Dakota, New Jersey, and Saskatchewan, though only those from Montana, Utah, and New Mexico are based on material sufficient to justify the referral. One specimen has been reported from the Darbasa Formation of Kazakhstan, although the species status is indeterminate for the fossil. The genus first appeared during the late Campanian stage of the Late Cretaceous (Judithian North American stage) and became extinct during the late Maastrichtian stage of the Cretaceous (Lancian North American Land Mammal "Age"). ''Brachychampsa'' is distinguished by an enlarged fifth maxillary tooth in the upper jaw. Species The type species of ''Brachychampsa'' is ''B. montana'', first discovered from the Hell Creek Formation of Montana and described by Charles W. Gilmore in a paper in 1911. In that same paper, Gilmore recombine ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ceratosuchus
''Ceratosuchus'' is an extinct genus of alligatorine crocodylian from latest Paleocene rocks of Colorado's Piceance Basin and earliest Eocene rocks of Wyoming's Bighorn Basin in North America, a slice of time known as the Clarkforkian North American Land Mammal Age. Like its modern relatives, ''Ceratosuchus'' was a swamp-dwelling predator. It is named for the pair of flattened, triangular bony plates that extend from the back of its head. The type species is ''C. burdoshi'', a name chosen by the Field Museum after Theodore Burdosh discovered a nearly complete skull on an expedition to Western Colorado in 1937. "Fortunately, a knob of bone projecting from an otherwise undistinguished piece of rock had caught the eye of Mr. Burdosh, and the block had been broughtto the Museum. When the rock was chipped away, the insignificant external lump proved to belong to a fairly complete skull of a fossil crocodilian allied to the alligators; and on one posterior corner it bore a tria ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Navajosuchus
''Navajosuchus'' is an extinct genus of alligatorine crocodylian. Its fossils have been found in the Paleocene-age Nacimiento Formation of the San Juan Basin, New Mexico (United States). It was named in 1942 by Charles C. Mook, and the original type species was ''N. novomexicanus''. ''N. novomexicanus'' was based on AMNH 5186, a partial skull collected in 1913. Later research showed that ''Navajosuchus novomexicanus'' was the same as the earlier-named ''Allognathosuchus mooki''. However, ''A. mooki'' does not belong to the genus ''Allognathosuchus'', and so the name of the crocodilian becomes ''Navajosuchus mooki''. Under whichever name is used, this animal would have been a generalized predator of the Nacimiento floodplains. It was the most common Nacimiento Formation crocodilian, found in both the Puercan and Torrejonian faunal assemblages. The precise placement of ''Navajosuchus'' within Alligatoroidea is disputed. Some studies have shown it as a basal member of All ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Globidonta
Globidonta is a clade of alligatoroids that includes alligators, caimans, and closely related extinct forms. It is defined as a stem-based clade including ''Alligator mississippiensis'' (the American Alligator) and all forms more closely related to it than to ''Diplocynodon''. The group's fossil range extends back into the Late Cretaceous with early alligatoroids such as '' Albertochampsa'' and '' Brachychampsa''. Extinct globidontans were particularly common in North America and Eurasia, and their modern range also includes South America. Basal globidontans are characterized by their blunt snouts and bulbous teeth. Modern globidontans have flattened snouts and more conical teeth, and are seen as more generalized than earlier globidontans. Generalized forms are usually expected to be ancestral to more specialized forms rather than descendants of them, so it is unusual for basal members of the group to appear specialized. This seems to conflict with the "Law of the Unspecialized ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Extinct
Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and recover may have been lost before this point. Because a species' potential range may be very large, determining this moment is difficult, and is usually done retrospectively. This difficulty leads to phenomena such as Lazarus taxa, where a species presumed extinct abruptly "reappears" (typically in the fossil record) after a period of apparent absence. More than 99% of all species that ever lived on Earth, amounting to over five billion species, are estimated to have died out. It is estimated that there are currently around 8.7 million species of eukaryote globally, and possibly many times more if microorganisms, like bacteria, are included. Notable extinct animal species include non-avian dinosaurs, saber-toothed cats, dodos, m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alligatoroidea
Alligatoroidea is one of three superfamilies of crocodylians, the other two being Crocodyloidea and Gavialoidea. Alligatoroidea evolved in the Late Cretaceous period, and consists of the alligators and caimans, as well as extinct members more closely related to the alligators than the two other groups. Evolution The superfamily Alligatoroidea is thought to have split from the crocodile-gharial lineage in the late Cretaceous, about 80 million years ago, but possibly as early as 100 million years ago based on molecular phylogenetics. ''Leidyosuchus'' of Alberta is the earliest known genus. Fossil alligatoroids have been found throughout Eurasia as land bridges across both the North Atlantic and the Bering Strait have connected North America to Eurasia during the Cretaceous, Paleogene, and Neogene periods. Alligators and caimans split in North America during the early Tertiary or late Cretaceous (about 53 million to about 65 million years ago) and the latter reached South Ameri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stangerochampsa
''Stangerochampsa'' is an extinct genus of globidontan alligatoroid, possibly an alligatorine or a stem-caiman, from the Late Cretaceous of Alberta. It is based on RTMP.86.61.1, a skull, partial lower jaws, and partial postcranial skeleton discovered in the late Campanian–early Maastrichtian-age Horseshoe Canyon Formation. ''Stangerochampsa'' was described in 1996 by Wu and colleagues. The type species is ''S. mccabei''. The generic name honors the Stanger family, the owners of the ranch where the specimen was found, and the species name honors James Ross McCabe, who discovered, collected, and prepared it. ''Stangerochampsa'' is described as "small to medium–sized"; the type skull is long from the tip of the snout to the occipital condyle, and is wide at its greatest, while the thigh bone is long. It had heterodont dentition, with large crushing teeth at the rear of the jaws. Classification Wu and colleagues, using phylogenetic analyses, found their new genus to b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deinosuchus
''Deinosuchus'' () is an extinct genus of alligatoroid crocodilian, related to modern alligators and caimans, that lived 82 to 73 million years ago (Ma), during the late Cretaceous period. The name translates as "terrible crocodile" and is derived from the Greek ''deinos'' (δεινός), "terrible", and ''soukhos'' (σοῦχος), "crocodile". The first remains were discovered in North Carolina (United States) in the 1850s; the genus was named and described in 1909. Additional fragments were discovered in the 1940s and were later incorporated into an influential, though inaccurate, skull reconstruction at the American Museum of Natural History. Knowledge of ''Deinosuchus'' remains incomplete, but better cranial material found in recent years has expanded scientific understanding of this massive predator. Although ''Deinosuchus'' was far larger than any modern crocodile or alligator, with the largest adults measuring in total length, its overall appearance was fairly simi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
.jpg "Click for more on -> Extinct")
