Lewis O J
J Anat. 1980 May;130(Pt 3):527-43.
Evidence is presented to suggest that the eutherian ankle joint has been derived from a meniscus-containing joint such as that found in extant arboreal marsupials. Probable morphological derivatives of this meniscus are identifiable in the Eutheria. The form and function of the joint are described in sub-human Primates and the adaptations which characterize the joint in bipedal man are noted. These morphological findings permit some speculation about the palaeocology of the earliest mammals with particular reference to the emergence of the order Primates.
有证据表明，真兽类的踝关节源自一种含有半月板的关节，类似于现存树栖有袋动物的关节。在真兽类中可以识别出这种半月板可能的形态衍生物。文中描述了非人灵长类动物关节的形态和功能，并指出了两足行走的人类关节所具有的适应性特征。这些形态学发现使得我们能够对最早的哺乳动物的古生态学进行一些推测，特别是关于灵长目动物的出现。
