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Science 24 February 1967:
Vol. 155. no. 3765, pp. 1006 - 1009
DOI: 10.1126/science.155.3765.1006
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Articles

American Jurassic Symmetrodonts and Rhaetic "Pantotheres"

A. W. Crompton 1 and F. A. Jenkins Jr. 1

1 Department of Geology, Yale University, New Haven, Connecticut

The molar morphology of the symmetrodonts Tinodon and Eurylambda from the late Jurassic of North America is virtually identical to that of so-called "pantotheres" from the Rhaetic of Wales. Therefore a primitive symmetrodont molar pattern was probably present in the phylogeny of pantotherian and tribosphenic molars. Occlusion of Tinodon and Eurylambda produced complex wear facets unlike the simple trigon-trigonid shear surfaces of Spalacotherium and Peralestes.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)