Pliocene and Pleistocene Records of Fossil Turtles from Western Kansas and Oklahoma / University of Kansas Publications Museum of Natural History Volume 1

by Edwin C. Galbreath

Pseudemys sp. No. 5613, Sherman County; 6784, Seward County; and 4728, Meade County, are three of many fragments, mainly elements of the nuchal plate and plastron, that were collected from Edson Quarry, Sherman County, Kansas, and from middle and late Pliocene beds in Seward and Meade counties, Kansas, respectively. The species represented cannot be differentiated from species of Pseudemys living today. Species of Pseudemys are common also in most of the Pleistocene deposits of western Kansas.

Family TESTUDINIDAE

Testudo sp. In general, two recognizable lines of the genus Testudo existed in western Kansas during early Pliocene to mid-Pleistocene time—a line of large testudinates with a carapace three to four feet long, and one line of smaller tortoises with a rugose carapace approximately six to nine inches in diameter. Hibbard's Testudo riggsi (Hibbard, 1944) is the best known of these smaller turtles.

Gopherus sp. No. 5935 is from the Pleistocene of Harper County, Kansas, and No. 7677 is from the early Pleistocene of Beaver County, Oklahoma. Each is composed of costals and neurals which may be referred to this genus. Their size indicates an animal considerably larger than any on record, and probably these specimens represent a new species.

Family CHELYDRIDAE

Chelydra sp. No. 6821 is the anterior part of a plastron from the Edson Quarry, Sherman County, Kansas. The age is middle Pliocene. This fragment has been listed three times in print, once merely as Chelonia (having reference to the order) (Adams and Martin, 1931), and twice by Hibbard (1934 and 1939) as Chelonia sp. Hibbard's listing was obviously a lapsus calami for Chelydra since he placed the genus in the family Chelydridae.

No. 6479 is part of a costal and marginals from Meade County, Kansas. This specimen was associated with Aenocyon dirus, and is Pleistocene in age.

Family TRIONYCHIDAE

Amyda sp. No. 6800 is part of a costal collected in Seward County, Kansas. It is possibly of early Pleistocene age. No. 7568 is part of a carapace from Meade County, Kansas, probably of the same age.

LITERATURE CITED