Immunodiffusion systematics of the primates. III. The strepsirhini.

Immunodiffusion comparisons have been run using 26 antisera including seven made to strepsirhine species. Spur size data resulting from these comparisons have been analyzed by computer and depict Strepsirhini as a monophyletic group within Primates including Lemuriformes and Lorisiformes. Cheirogaleidae is retained with Lemuriformes. Indriidae rather than Cheirogaleidae is depicted as closer to Lemur. Evidence is presented indicating that Lorisiformes is composed of three groups rather than two as in traditional classifications. The three groups, which are considered here to diverage at a family level, are Galagidae, Lorisidae, and Perodicticidae.