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UNIVERSITY OF KANSAS PUBLICATIONS
MUSEUM OF NATURAL HISTORY
Volume 14, No. 17, pp. 483-491, 2 figs. March 2, 1964
Records of the Fossil Mammal Sinclairella, Family Apatemyidae, From the Chadronian and Orellan
WILLIAM A. CLEMENS, JR.
UNIVERSITY OF KANSAS LAWRENCE 1964
UNIVERSITY OF KANSAS PUBLICATIONS, MUSEUM OF NATURAL HISTORY
Editors: E. Raymond Hall, Chairman, Henry S. Fitch, Theodore H. Eaton, Jr.
Volume 14, No. 17, pp. 483-491, 2 figs. Published March 2, 1964
UNIVERSITY OF KANSAS Lawrence, Kansas
PRINTED BY HARRY TIMBERLAKE, STATE PRINTER TOPEKA, KANSAS
Records of the Fossil Mammal Sinclairella, Family Apatemyidae, From the Chadronian and Orellan
WILLIAM A. CLEMENS, JR.
Introduction
I thank Mr. Raymond M. Alf, Webb School of California, Claremont, California, and Dr. Peter Robinson, University of Colorado Museum, Boulder, Colorado, for permitting me to describe the fossils they discovered. Also Dr. Robinson made available the draft of a short paper he had prepared on the tooth found in Weld County, Colorado; his work was facilitated by a grant from the University of Colorado Council on Research and Creative Work. I also gratefully acknowledge receipt of critical data and valuable comments from Drs. Edwin C. Galbreath, Glenn L. Jepsen, and Malcolm C. McKenna who is currently revising the Paleocene apatemyids and studying the phylogenetic relationships of the family. The prefixes of catalogue numbers used in the text identify fossils in the collections of the following institutions: KU, Museum of Natural History, The University of Kansas, Lawrence; Princeton, Princeton Museum, Princeton, New Jersey; RAM-UCR, Raymond Alf Museum, Webb School of California, Claremont, California ; and UCM, University of Colorado Museum, Boulder, Colorado. The system of notations for teeth prescribed for use here is as follows: teeth in the upper half of the dentition are designated by a capital letter and a number; thus M2 is the notation for the upper second molar; teeth in the lower half of the dentition are designated by a lower-case letter and a number; thus p2 is the notation for the lower second premolar.
Family APATEMYIDAE Matthew, 1909
Sioux County, northwestern Nebraska
Logan County, northeastern Colorado
Only a few differences were found between the molars preserved in KU no. 11210 and their counterparts in the type specimen. A stylar shelf is present labial to the metacone of M1 of KU no. 11210, but, unlike the type, its surface is smooth and there is no evidence of cusps. Of the three small stylar cusps on the stylar shelf of M2 the smallest is in the position of a mesostyle. The M2 lacks a chip of enamel from the lingual surface of the hypocone. Unlike the M2 of Princeton no. 13585, in occlusal view the posterior margin of the M2 of KU no. 11210 is convex posterior to the metacone. The anterior edge of the base of the zygomatic arch of KU no. 11210 was dorsal to M2. The shallow oval depression in the maxillary dorsal to M1 might be the result of post-mortem distortion.
Weld County, northeastern Colorado
Comments
TABLE 1.--MEASUREMENTS OF TEETH OF SINCLAIRELLA DAKOTENSIS JEPSEN.
Literature Cited
GALBREATH, E. C. 1953. A contribution to the Tertiary geology and paleontology of northeastern Colorado. Univ. Kansas Paleont. Cont., Vertebrata, art. 4, pp. 1-120, 2 pls., 26 figs.
HOUGH, J., and ALF, R. 1958. A Chadron mammalian fauna from Nebraska. Journ. Paleon. 30:132-140, 4 figs.
MCKENNA, M. C. 1960. Fossil Mammalia from the early Wasatchian Four Mile fauna, Eocene of northwest Colorado. Univ. California Publ. in Geol. Sci., 37:1-130, 64 figs.
MATTHEW, W. D. 1909. The Carnivora and Insectivora of the Bridger Basin, Middle Eocene. Mem. Amer. Mus. Nat. Hist., 9:289-567, pls. 42-52, 118 figs.
PATTERSON, B. and MCGREW, P. O. 1937. A soricid and two erinaceids from the White River Oligocene. Geol. Ser., Field Mus. Nat. Hist., 6:245-272, figs. 60-74.
SIMPSON, G. G. 1944. Tempo and mode in evolution. New York: Columbia Univ. Press, xviii + 237 pp., 36 figs.
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