[8] They also possess a tall sagittal crest and a strong postorbital constriction of the braincase in order to support massive temporalis muscles that facilitated powerful chewing.

The dental anatomy of Adapis is characterized by dominant buccal shearing crests adapted for a folivorous and partially frugivorous diet.

The ankle morphology of Adapis differs from that of notharctid taxa in its abbreviated astragalar neck and reduced distal aspect of the calcaneus.

Recent research showed that some fossil humeri of Adapis exhibit morphology that is comparable to living active arboreal quadrupeds.

A. parisiensis appears to have been a medium-sized (compared to the large-bodied A. magnus with an estimated body mass of 8.4-9.0 kg),[8] visually oriented, diurnal, sexually dimorphic arboreal folivore.

[8] Examinations of the dental microwear reveal striations on molar wear facets A. magnus, which suggests complex, three-directional mandibular movement during mastication.

[10] In comparison with living primates, many researchers have considered the body size dimorphism in Adapis as indicative of a polygynous mating system.

This interpretation of inner-ear morphology has led some researchers to compare the social and activity behaviors of A. parisiensis to that of Perodicticus potto and Nycticebus coucang, which are extant primates that are solitary, nocturnal, and monogamous.

Moreover, this morphology lends to the hypothesis that A. parisiensis had a small home range with sensitivity to high frequencies that do not broadcast over long distances.