Fig. 4.

Measurements of shearing crest development on the molar teeth of Vastan primates. (A) Ratio of second lower molar length to summed lengths of six principal M₂ shearing crests. (B) Ratio of first upper molar length to summed lengths of four principal buccal shearing crests. Color-coded bars (blue, insects; red, fruit; yellow, gums) indicate principal dietary item (34). Asiadapis, Vastanomys, and Marcgodinotius fall within the range of extant prosimian fruit and gum eaters such as the extant mouse lemur Microcebus, which also eats a substantial amount of insects (Table 2).