Chelydridae

Chelydrids; Temporal range: 70.6–0 Ma PreꞒ Ꞓ O S D C P T J K Pg N Late Cretaceous to Recent
	The common snapping turtle (Chelydra serpentina)
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Order:	Testudines
Suborder:	Cryptodira
Clade:	Chelydroidea
Family:	Chelydridae; Gray, 1831
Genera
	Chelydra; Macrochelys; †Acherontemys; †Chelydrops; †Chelydropsis; †Emarginachelys; †Macrocephalochelys; †Planiplastron; †Protochelydra;
Synonyms
	Chelydrae Gray, 1831:4; Chelydridae Swainson, 1839:113; Chelydradae Gray, 1869:178;

The Chelydridae is a family of turtles that has seven extinct and two extant genera. The extant genera are the snapping turtles, Chelydra and Macrochelys. Both are endemic to the Western Hemisphere. The extinct genera are Acherontemys, Chelydrops, Chelydropsis, Emarginachelys, Macrocephalochelys, Planiplastron, and Protochelydra.

Fossil history

The Chelydridae have a long fossil history, with extinct species reported from North America as well as all over Asia and Europe, far outside their present range. The earliest described chelydrid is Emarginachelys cretacea, known from well-preserved fossils from the Maastrichtian stage of the Late Cretaceous of Montana.^[1] Another well-preserved fossil chelydrid is the Late Paleocene Protochelydra zangerli from North Dakota.^[6] The carapace of P. zangerli is higher-domed than that of the recent Chelydra, a trait conjectured to be associated with the coexistence of large, turtle-eating crocodilians. Another genus, Chelydropsis, contains several well-known Eurasian chelydrid species that existed from the Oligocene to the Pliocene.^[7] In South America, chelydrids (C. acutirostris) only occupy the northwestern corner of the continent, reflecting their recent arrival from Central America as part of the Great American Interchange.

Gallery

Common snapping turtle at Taum Sauk Mountain State Park
Two-year-old captive-raised snapping turtle from Pennsylvania
Female next to can to show size
Skeleton of alligator snapping turtle at the Museum of Osteology
Female snapping turtle laying eggs (not visible), Pleasant Valley Wildlife Sanctuary, Lenox, Massachusetts
Female laying eggs

References

^ ^a ^b Emarginachelys cretacea, Paleobiology Database
^ ^a ^b Gray, John Edward. (1831). Synopsis Reptilium; or Short Descriptions of the Species of Reptiles. Part I.—Cataphracta. Tortoises, Crocodiles, and Enaliosaurians. London: Treuttel, Wurz, and Co., 85 pp. [Published May 1831].
^ Turtle Taxonomy Working Group [van Dijk, P.P., Iverson, J.B., Shaffer, H.B., Bour, R., and Rhodin, A.G.J.]. (2012). Turtles of the World, 2012 update: annotated checklist of taxonomy, synonymy, distribution, and conservation status. Chelonian Research Monographs No. 5, pp. 000.243–000.328, doi:10.3854/crm.5.000.checklist.v5.2012, "Archived copy" (PDF). Archived from the original (PDF) on 2013-06-16. Retrieved 2014-04-19.{{cite web}}: CS1 maint: archived copy as title (link)
^ Swainson, William. (1839). On the natural history and classification of fishes, amphibians, and reptiles. Vol. II. In: Lardner, D. (Ed.). The Cabinet Cyclopaedia. Natural History. London: Longman, 452 pp.
^ Gray, John Edward. (1869). Notes on the families and genera of tortoises (Testudinata), and on the characters afforded by the study of their skulls. Proceedings of the Zoological Society of London 1869:165–225.
^ Danilov G. and J. F. Parham. (2008). A reassessment of some poorly known turtles from the Middle Jurassic of China, with comments on the antiquity of extant turtles. Journal of Vertebrate Paleontology 28(2):306-318
^ Böhme, M. (2008). Ectothermic vertebrates (Teleostei, Allocaudata, Urodela, Anura, Testudines, Choristodera, Crocodylia, Squamata) from the Upper Oligocene of Oberleichtersbach (Northern Bavaria, Germany). Courier Forschungsinstitut Senckenberg 260:161-183

External links

Media related to Chelydridae at Wikimedia Commons
Data related to Chelydridae at Wikispecies

[PB-1] Emarginachelys cretacea, Paleobiology Database

[gray1831-2] Gray, John Edward. (1831). Synopsis Reptilium; or Short Descriptions of the Species of Reptiles. Part I.—Cataphracta. Tortoises, Crocodiles, and Enaliosaurians. London: Treuttel, Wurz, and Co., 85 pp. [Published May 1831].

[ttwg-3] Turtle Taxonomy Working Group [van Dijk, P.P., Iverson, J.B., Shaffer, H.B., Bour, R., and Rhodin, A.G.J.]. (2012). Turtles of the World, 2012 update: annotated checklist of taxonomy, synonymy, distribution, and conservation status. Chelonian Research Monographs No. 5, pp. 000.243–000.328, doi:10.3854/crm.5.000.checklist.v5.2012, "Archived copy" (PDF). Archived from the original (PDF) on 2013-06-16. Retrieved 2014-04-19.{{cite web}}: CS1 maint: archived copy as title (link)

[swain1839-4] Swainson, William. (1839). On the natural history and classification of fishes, amphibians, and reptiles. Vol. II. In: Lardner, D. (Ed.). The Cabinet Cyclopaedia. Natural History. London: Longman, 452 pp.

[gray1869-5] Gray, John Edward. (1869). Notes on the families and genera of tortoises (Testudinata), and on the characters afforded by the study of their skulls. Proceedings of the Zoological Society of London 1869:165–225.

[6] Danilov G. and J. F. Parham. (2008). A reassessment of some poorly known turtles from the Middle Jurassic of China, with comments on the antiquity of extant turtles. Journal of Vertebrate Paleontology 28(2):306-318

[7] Böhme, M. (2008). Ectothermic vertebrates (Teleostei, Allocaudata, Urodela, Anura, Testudines, Choristodera, Crocodylia, Squamata) from the Upper Oligocene of Oberleichtersbach (Northern Bavaria, Germany). Courier Forschungsinstitut Senckenberg 260:161-183

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Chelydrids Temporal range: 70.6–0 Ma PreꞒ Ꞓ O S D C P T J K Pg N Late Cretaceous^[1] to Recent

The common snapping turtle (Chelydra serpentina)
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Order:	Testudines
Suborder:	Cryptodira
Clade:	Chelydroidea
Family:	Chelydridae Gray, 1831^[2]
Genera
Chelydra Macrochelys †Acherontemys †Chelydrops †Chelydropsis †Emarginachelys †Macrocephalochelys †Planiplastron †Protochelydra
Synonyms^[3]
Chelydrae Gray, 1831:4^[2] Chelydridae Swainson, 1839:113^[4] Chelydradae Gray, 1869:178^[5]