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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
humero-pectoral sulcus from midline to outer border, 38; length of margin of pectoral scute on midline, 18; distance between junction of humero-pectoral sulcus and outer border and point on pectoro-abdominal sulcus equidistant from midline, 19; distance from axillary notch to point on pectoro-abdominal sulcus equidistant from midline, 17.
Abdominal scute: Length of margin of scute on midline, 43; width of posterior border of abdominal scute from midline to inguinal notch, 41; distance from inguinal notch to a point on pectoro-abdominal sulcus equidistant from midline, 44.
Femoral scute: Length of border of scute on midline, 24; width of anterior border of scute from midline to inguinal notch, 41; width of posterior border of scute from midline to outer border (along sulcus), 40; length of outer margin of scute from inguinal notch to femoro-anal sulcus, 46.
Anal scute: Length of margin at midline, 36; length of femoro-anal sulcus, 40.
Remarks.—Noteworthy is the intermediate nature of C. limnodytes when compared with species of the genera Chrysemys and Pseudemys. However, any resemblance to Pseudemys is not to be considered as evidence that C. limnodytes is in any way ancestral to the genus Pseudemys. The fossil specimens of Pseudemys from the Pliocene are too poorly known to allow the student certainly to place them in their correct systematic positions. The fossil Emydids from Western Europe, listed as species of Chrysemys, differ very much from this species, or belong to other genera of the family.
Only a few turtles are known from the Laverne formation. Hesse (Chaney and Elias, 1936) reported a small Testudo from the Laverne of Beaver County, Oklahoma, but neglected to state whether it was among the material borrowed by him from the University of Kansas Museum of Natural History. The Museum has an incomplete carapace and plastron (No. 3101) of a small Testudo from that locality and formation. In Harper County, Oklahoma, the field party from the University recovered a large number of fragments of a large Testudo. Although this specimen is as yet unprepared, enough fragments have been pieced together to reveal that the tibia is 127 mm. long. This dimension and those of some of the fragments indicate that the animal may have been four to five feet long.
Mrs. Bernita Mansfield of the Geology Department, University of Kansas, prepared the plate.
LITERATURE CITED
Bergounioux, Frederic-Marie.
1935. Contribution a l'étude paléontoligique des chéloniens: Chéloniens fossiles du Bassin d'Aquitaine. Memoires de la Société géologique de France, vol. 11, Mem. 25, pp. 1-215, 44 figs., 16 pls.
1937. Relations fauniques entre des chélonien fossiles de l'Espagne et de la France. Comptes Rendus Acad. Sci. Paris, vol. 204, pp. 793-795.
1938. Chéloniens fossiles d'Espagne. Bulletin de la Societe d'histoire Naturelle de Toulouse, vol. 72, pp. 257-288, 7 figs.
Chaney, R. W., and Elias, M. K.
1936. Late Tertiary Floras from the High Plains, with a Chapter on the Lower Pliocene Vertebrate Fossils from the Ogallala Formation (Lavern Zone) of Beaver County, Oklahoma, by Curtis J. Hesse. Publ. Carnegie Inst. Wash., No. 476, pp. 1-72, 11 figs., 7 pls.
Frye, J. C., and Hibbard, C. W.
1941. Pliocene and Pleistocene Stratigraphy and Paleontology of the Meade Basin, Southwestern Kansas. University of Kansas Publications, State Geological Survey of Kansas, Bulletin 38, pp. 389-424, 3 figs., 4 pls.
Hay, O. P.