Pancheloniidae is a

clade In biology, a clade (), also known as a Monophyly, monophyletic group or natural group, is a group of organisms that is composed of a common ancestor and all of its descendants. Clades are the fundamental unit of cladistics, a modern approach t ...

sea turtle Sea turtles (superfamily Chelonioidea), sometimes called marine turtles, are reptiles of the order Testudines and of the suborder Cryptodira. The seven existing species of sea turtles are the flatback, green, hawksbill, leatherback, loggerh ...

s It is defined as all turtles more closely related to

cheloniid Cheloniidae is a family of typically large marine turtles that are characterised by their common traits such as, having a flat streamlined wide and rounded shell and almost paddle-like flippers for their forelimbs. They are the only sea turtles ...

sea turtles than to dermochelyid ("leatherback") sea turtles.Joyce W.G, Parham J.F, Gauthier J.A. Developing a protocol for the conversion of rank-based taxon names to phylogenetically defined clade names, as exemplified by turtles. J. Paleont. 2004;78:989–1013.

Genera

The following genera are placed here: * †''

Argillochelys ''Argillochelys'' is an extinct genus of sea turtle from the middle to lower Eocene in what is now the island of Great Britain. It was first named by Lydekker in 1889. A species, ''A. africana'', was found in Morocco, and described in 2008 by To ...

'' * †'' Catapleura'' * †

Ctenochelyidae Ctenochelyidae is an extinct family of sea turtles which lived in North America during the Santonian-Maastrichtian stages of the Late Cretaceous. Classification The family is defined as a monophyletic clade arising from the most recent ancestors ...

* †'' Erquelinnesia'' * '' Glossochelys'' * †'' Glyptochelone'' * †'' Itilochelys'' * †'' Lytoloma'' * †''

Osteopygis ''Osteopygis'' is a genus of extinct turtle. ''Osteopygis'', as traditionally seen, is a chimera: the postcrania (including the holotype A holotype (Latin: ''holotypus'') is a single physical example (or illustration) of an organism used w ...

'' * †'' Pampaemys'' * †''

Peritresius ''Peritresius'' is an extinct genus of sea turtle from the Late Cretaceous deposits in the US Eastern Seaboard. Taxonomy Two species are known, ''Peritresius ornatus'' (Leidy, 1856) and ''P. martini'' Gentry, Parham, Ehret, and Ebersole, 2018, b ...

'' * †'' Porthochelys'' * †''

Prionochelys ''Prionochelys'' is an extinct genus of pancheloniid from the Mooreville Chalk and Eutaw Formations of Alabama. It consists of a single species, ''P. matutina''. Taxonomy ''Prionochelys'' was originally assigned to the family Toxochelyidae ...

'' * †'' Procolpochelys'' * †'' Retechelys'' * †'' Thinochelys''

Historic taxon placement

The following list of non-cheloniid pancheloniid species was published by Hirayama and Tong in 2003 * †'' Allopleuron hoffmani'', later assigned to

Cheloniidae Cheloniidae is a family of typically large marine turtles that are characterised by their common traits such as, having a flat streamlined wide and rounded shell and almost paddle-like flippers for their forelimbs. They are the only sea turtles ...

* †'' Catapleura arcansaw'' * †'' Catapleura repanda'' * †'' Ctenochelys stenoporus'' * †'' Erquelinnesia gosseleti'' * †'' Glyptochelone suyckerbuykii'' * †'' Lytoloma cantabrigiens'' * †'' Osteopygis emarginatus'' * †'' Pampaemys meridionalis'' * †'' Peritresius ornatus'' * †'' Porthochelys laticeps'' * †'' Prionochelys nauta'' * †'' Retechelys platyops'' * †'' Tasbacka aldabergeni'', later assigned to

* †'' Thinochelys lapisossea'' * †'' Toxochelys latiremis'', later assigned to clade

Durocryptodira The Cryptodira (') are a suborder of Testudines that includes most living tortoises and turtles. Cryptodira is commonly called the "Hidden-Neck Turtles" or the "Inside-Neck Turtles". Cryptodira differ from Pleurodira (side-necked turtles) in t ...

Cladogram

Below is a

cladogram A cladogram (from Greek language, Greek ''clados'' "branch" and ''gramma'' "character") is a diagram used in cladistics to show relations among organisms. A cladogram is not, however, an Phylogenetic tree, evolutionary tree because it does not s ...

showing the phylogenetic relationships of living and extinct sea turtles in the clade Pancheloniidae based on Lynch and Parham (2003) and Parham and Pyenson (2010). Lytoloma

References

{{Taxonbar, from=Q16987224 Chelonioidea