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قراءة كتاب A New Extinct Emydid Turtle from the Lower Pliocene of Oklahoma
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A New Extinct Emydid Turtle from the Lower Pliocene of Oklahoma
A New Extinct Emydid Turtle from the Lower
Pliocene of Oklahoma
BY
EDWIN C. GALBREATH
University of Kansas Publications
Museum of Natural History
Volume 1, No. 16, pp. 265-280, plate 1
August 16, 1948
University of Kansas
LAWRENCE
1948
University of Kansas Publications, Museum of Natural History
Editors: E. Raymond Hall, Chairman; H. H. Lane, Edward H. Taylor
Volume 1, No. 16, pp. 265-280, plate 1
August 16, 1948
University of Kansas
Lawrence, Kansas
PRINTED BY
FERD VOILAND, JR., STATE PRINTER
TOPEKA, KANSAS
1948
22-3340
Plate 1. Chrysemys limnodytes. Univ. Kans. Mus. Nat. Hist., Vert. Paleo. Coll. No. 7676. Fig. A, dorsal view of carapace; fig. B, ventral view of plastron. Both views approximately × .4.A New Extinct Emydid Turtle from the Lower Pliocene
of Oklahoma
By
EDWIN C. GALBREATH
In the summer of 1946 a party from the University of Kansas Museum of Natural History visited exposures of the Laverne formation in Beaver County, Oklahoma, at the invitation of Dr. Stuart Schoff of the United States Geological Survey. When examining the marl beds an Emydid turtle was discovered which appears to be an unnamed species of the genus Chrysemys. A description of the new species follows.
Chrysemys limnodytes, new species
Holotype.—University of Kansas Museum of Natural History No. 7676, vertebrate paleontological collection, a turtle consisting of a fragmental anterior portion of a carapace, left part of the plastron, and several marginals collected by the 1946 paleontological field party of the University of Kansas Museum of Natural History.
Geological Age and locality.—Marl beds of the Laverne formation, early Pliocene age, in SW 1/4 Sec. 15, T. 4 N., R. 25 ECM, Beaver County, Oklahoma. The specimen was removed from the marl immediately below the fossil leaf zone (see Chaney and Elias, 1936; Frye and Hibbard, 1940).
Diagnosis.—Size large (see measurements) and differing from other species of Chrysemys in having: The anterior end of the carapace broadly concave, the posterolateral marginals not greatly flared, the posterior end of the plastron broadly indented, the carapace more sculptured and relatively wider.
Description of type.—The specimen had been badly damaged before preservation, and had suffered further damage from exposure before discovery. The anterior and posterior lobes of the plastron had been folded over the bridge, forming a three-ply thickness of bone. Of the carapace, only the following parts are known: Fragment of the nuchal; right 1st, 7th, 8th, and 9th marginals, left 1st, 2d, 7th, 8th, 9th, and 11th marginals; costals 1-5 on the right side; costals 1-4 on the left side; and 1st, 2d, 3d, and 4th neurals. The left half of the plastron is relatively complete, lacking only the epiplastron and entoplastron. The left 7th, 8th, and 9th marginals are joined to the plastron at the inguinal buttress, and the right 7th, 8th, and 9th marginals are attached to the fifth