No primate has more than two incisors per quadrant. Haplorhines also possess a short snout and a dry nose. Strepsirhines primitively possess a wet nose, like other mammals. See Primate Taxonomy . Lemurs are indigenous to Madagascar, where there are no monkeys, and include both nocturnal and diurnal species.
Tarsiers comprise a genus of tiny, nocturnal, arboreal insectivores.
They leap through the trees with the aid of extremely long tarsal bones, for which they are named. Much of the skull is occupied by the two large orbits. These originally South American primates now range northward into Mexico. The tail is retained in arboreal groups for balance and steering while airborne, but is lost in some terrestrial species. Their molar teeth on lower jaw have five prominent cusps.