Prosimii (cohort Unguiculata, order Primates) In many classifications the primates are grouped into two suborders: Anthropoidea, which includes the Old and New World monkeys, apes, and humans; and the Prosimii, comprising the more primitive lemurs, lorises, and tarsiers. Prosimii, therefore, is sometimes used for a suborder to include the four infra-orders: Plesiadapiformes, of extinct primates; Lemuriformes, of the lemurs and like forms; Lorisiformes, of the lorises and potto; and Tarsiiformes of the tarsiers. In modern classifications the tarsiers are included with the anthropoids in the suborder Haplorrhini and the remaining living primates are then placed in the suborder Strepsirrhini, the Plesiadapiformes being placed in a third suborder.
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