​CATARRHINE APE, the term used to describe those apes which have the nostrils approximated, the aperture pointing downward, and the intervening septum narrow; distinguishing features of both the lower “doglike” apes (Cynomorpha) and the higher “manlike” apes (Anthropomorpha). The Catarrhini are restricted entirely to the Old World, and include the gorilla, the chimpanzee and orang-utan.