美国侏罗纪的对称兽类和瑞替期的“泛兽类”

American Jurassic symmetrodonts and Rhaetic "pantotheres".

作者信息

Crompton A W, Jenkins F A

出版信息

Science. 1967 Feb 24;155(3765):1006-9. doi: 10.1126/science.155.3765.1006.

DOI:10.1126/science.155.3765.1006

Abstract

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.

摘要

来自北美洲晚侏罗世的对称齿兽类的Tinodon和Eurylambda的臼齿形态，实际上与来自威尔士瑞替阶的所谓“泛兽类”的臼齿形态相同。因此，在泛兽类和三楔齿兽类臼齿的系统发育中，可能存在一种原始的对称齿兽类臼齿模式。Tinodon和Eurylambda的咬合产生了复杂的磨损面，这与 spalacotherium和Peralestes的简单三角-三角座剪切面不同。