Page "Adapidae" Paragraph 3

Adapid systematics and evolutionary relationships are controversial, but there is fairly good evidence from the postcranial skeleton ( everything but the skull, or cranium ) that adapids were stem strepsirrhines ( members of the group including the living lemurs, lorises, and bushbabies ).

In particular, the anatomy of the adapid wrist and ankle ( e. g., position of the groove for the flexor fibularis tendon on the talus, the presence of a sloping talo-fibular facet ) show derived similarities with those of living strepsirrhines.

However, ancient adapids lacked many of the anatomical specializations characteristic of living strepsirrhines, such as a toothcomb, a toilet-claw on the second pedal digit, and a reduction in the size of the promontory branch of the internal carotid artery.