A Catalogue of the Prosimians Seven families, subdivided into 3 groups: Lemuriformes and Lorisiformes which are the prosimians even if you classify by ancestry, and the Tarsiformes who are developmentally like the prosimians but are actually more closely related to the anthropoids. 1. Lemuriformes (All found only in Madagascar) Lemurs used to be all over the world, but they got outcompeted by ...