Learn Anthropology: Catarrhini - a subcategory of the primate infraorder Simiiformes that includes any primate considered an Old World monkey, an ape, or in the lineage of humans. This classification features downward-facing nostrils and a 2.1.2.3 dental formula.

Learn Anthropology: Catarrhini - a subcategory of the primate infraorder Simiiformes that includes any primate considered an Old World monkey, an ape, or in the lineage of humans. This classification features downward-facing nostrils and a 2.1.2.3 dental formula.