Page "Adapidae" Paragraph 1

Features that characterize many adapids include small orbits ( eye sockets ), elongate rostra, cheek teeth adapted for folivorous or frugivorous diets, and relatively large body mass ( i. e., greater than 1 kg ).

However, the endemic radiation of adapids in the early and middle Eocene of Europe included a number of taxa ( e. g., Anchomomys ) that were very small ( about 250 g or less ) and partly insectivorous.

Small orbits in genera such as Notharctus, Smilodectes, Adapis, Leptadapis, and Mahgarita indicate that these taxa were probably diurnal.

At least one adapid genus from the late Eocene of Europe ( Pronycticebus ) had large orbits and was probably nocturnal.