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Plastomeninae
Plastomeninae is an Extinction, extinct subfamily of Trionychidae, softshell turtles that inhabited most of North America from the Cretaceous to the Eocene. Members of this subfamily are also known as plastomenines. Taxonomy and evolution They are thought to have originated in North America during or shortly before the Campanian from basal Trionychidae, trionychids that dispersed from Asia. They reached their peak diversity from the Maastrichtian through the Paleocene, having survived the Cretaceous–Paleogene extinction event. However, they went entirely extinct by the Lutetian. The last surviving member of this subfamily is thought to have been ''Plastomenus thomasii'', which is the only known member of the subfamily to have survived past the Paleocene into the Eocene. Morphological analysis supports them being the Sister group, sister taxon to the Cyclanorbinae, flapshell turtles (subfamily Cyclanorbinae), which still survive to the present day in parts of tropical Asia an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hutchemys
''Hutchemys'' is an extinct genus of softshell turtles from the late Cretaceous (Maastrichtian stage) to the late Paleocene of New Mexico, Montana, Wyoming, Utah, and North Dakota, United States. It was first named by Walter G. Joyce, Ariel Revan, Tyler R. Lyson and Igor G. Danilov in 2009, and the type species is ''Hutchemys rememdium''. ''H. rememdium'' is known from the holotype YPM PU 16795, which consists of a nearly complete postcranial skeleton, and from the referred specimen YPM PU 16781, found in the Ekalaka Member of the Fort Union Formation, Montana. Another referred specimen, YPM PU 14985, was found in the Cedar Point Quarry, Wyoming. The second species, ''H. arctochelys'', is known from the holotype YPM PU 16319, a nearly complete carapace, and from the paratypes YPM PU 16320, YPM PU 16321, YPM PU 16322, YPM PU 16238. All specimens of ''H. arctochelys'' were recovered from the same quarr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aspideretoides Foveatus
''Aspideretoides'' is an extinct genus of soft-shelled turtle from the Late Cretaceous of North America. Naming and description The genus was named in 1995 by James D. Gardner and colleagues to unite multiple species that had at times been referred to the genera '' Aspideretes'' or '' Trionyx'', all from the Judith River Group or similar strata. The type species, ''A. foveatus'', was originally named as a species of ''Trionyx'' by Joseph Leidy in 1956, with the type specimen being a partial carapace and plastron, but referred specimens covering all regions of the skeleton as well as the skull. It is known definitively from the Judith River Formation and equivalent strata, the Two Medicine Formation, and probably the Hell Creek Formation, with unsubstantiated reports of ''A. foveatus'' suggest it may have lived beyond the end of the Cretaceous into the Paleocene or even Eocene. The second species, ''A. splendidus'', was originally named as a species of ''Aspideretes'' by Olive ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trionychidae
Trionychidae is a family of turtles, commonly known as softshell turtles or simply softshells. The family was described by Leopold Fitzinger in 1826. Softshells include some of the world's largest freshwater turtles, though many can adapt to living in highly brackish waters. Members of this family occur in Africa, Asia, and North America, with extinct species known from Australia. Most species have traditionally been included in the genus '' Trionyx'', but the vast majority have since been moved to other genera. Among these are the North American '' Apalone'' softshells that were placed in ''Trionyx'' until 1987. Characteristics Turtles of the family Trionychidae are called "softshell" because their carapaces lack horny scutes (scales), though the spiny softshell, '' Apalone spinifera'', does have some scale-like projections, to which its common name refers. The carapace is leathery and pliable, particularly at the sides. The central part of the carapace has a layer of solid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plastomenus
''Plastomenus'' is an extinct genus of turtle that inhabited western North America during the early Paleogene period. Evolution ''Plastomenus'' belongs to the clade Pantrionychidae, represented by softshell turtles in modern times. It is the type genus of the subfamily Plastomeninae (also treated as the family Plastomenidae), a group of extinct turtles that lived from the Late Cretaceous to the Eocene. The type species, ''P. thomasii'', was first described by Edward Drinker Cope in 1872. The following species are known: * †''P. joycei'' Lyson, Petermann & Miller, 2021 - Early Paleocene of Colorado, USA (Denver Formation) * †''P. thomasii'' (Cope, 1872) - Early to Middle Eocene (Ypresian to Lutetian The Lutetian is, in the geologic timescale, a stage (stratigraphy), stage or age (geology), age in the Eocene. It spans the time between . The Lutetian is preceded by the Ypresian and is followed by the Bartonian. Together with the Bartonian it ...) of Wyoming, USA ( Brid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gilmoremys
''Gilmoremys'' is an extinct genus of softshell turtle which lived during the late Cretaceous (Maastrichtian stage) of North Dakota, Montana and Wyoming, United States. Remains ''Gilmoremys'' is known from five skulls, a mandible and an incomplete postcranial skeleton. The holotype of ''G. lancensis'', USNM 6727, consists of a nearly complete carapace and an isolated hyoplastral fragment, was first assigned to the species '' Aspideretes lancensis''. Many additional specimens were later discovered including cranial remains, and the material was assigned to its own genus, ''Gilmoremys''. It was found from the Hell Creek Formation and from the Lance Formation (only the holotype). It was first named by Walter G. Joyce and Tyler R. Lyson in 2011 and the type species is ''Gilmoremys lancensis''. The generic name honors Dr. Charles W. Gilmore. A second species, ''G. gettyspherensis'', is known from the late Campanian Fruitland Formation of New Mexico. Morphology Juvenil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cyclanorbinae
Cyclanorbinae, also known commonly as the flapshell turtles, is a subfamily of softshell turtles in the family Trionychidae. The subfamily is native to Africa and Asia. Taxonomy Morphological evidence supports Cyclanorbinae being the sister group to the Plastomeninae, an extinct subfamily of softshell turtles that inhabited North America from the Cretaceous to the Eocene. Genera The subfamily Cyclanorbinae contains the following three extant genera.Turtle Taxonomy Working Group (Rhodin, Anders G.J.; Parham, James F.; van Dijk, Peter Paul; Iverson, John B.) (2009"Turtles of the World: Annotated Checklist of Taxonomy and Synonymy, 2009 Update". ''Chelonian Research Monographs'' (5): 000.39-000.84. (Cyclanorbinae, pp. 000.55-000.56). *'' Cyclanorbis'' *'' Cycloderma'' *''Lissemys'' One extinct prehistoric genus is also known from fossil remains: '' Nemegtemys'' , from the Cretaceous of Mongolia. Geographic range Species A species () is often defined as the largest gro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paleobiology Database
The Paleobiology Database (PBDB) is an online resource for information on the distribution and classification of fossil animals, plants, and microorganisms. History The Paleobiology Database originated in the NCEAS-funded Phanerozoic Marine Paleofaunal Database initiative, which operated from August 1998 through August 2000. From 2000 to 2015, PBDB received funding from the National Science Foundation. PBDB also received support form the Australian Research Council. From 2000 to 2010 it was housed at the National Center for Ecological Analysis and Synthesis, a cross-disciplinary research center within the University of California, Santa Barbara. It is currently housed at University of Wisconsin-Madison and overseen by an international committee of major data contributors. The Paleobiology Database works closely with the Neotoma Paleoecology Database, which has a similar intellectual history, but has focused on the Quaternary (with an emphasis on the late Pleistocene and Holoc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
