in 1994, showed it had a postorbital bar, proving that it was a strepsirrhine primate. Plesiopithecus was then placed within a new superfamily, Plesiopithecoidea tentatively under "Infraorder cf. Lorisiformes". The superfamily has also been grouped under the infraorder Lemuriformes. As of 2010, P. teras was represented by a nearly complete and partially crushed cranium and three partial mandibles. Prior to Simons' discovery of the right jaw, one of its molars had been found a few years earlier and incorrectly attributed to an Eocene lorisoid. Several cranial and facial similarities with living lorisoids indicate that it is closely related to lemuriforms (lemurs and lorisoids), although its lack of a toothcomb precludes it from being ancestral to either branch of the lemuriform clade. Due to the differences in dental anatomy, Plesiopithecus is thought to be a sister group to either lorisoids or all living lemuriforms. Anatomy and physiology With a skull length of nearly , Plesiopithecus was a medium-sized strepsirrhine primate. Its skull is marked by a high muzzle, klinorhynchy, and relatively large orbits. It has very large and procumbent upper canines that are straight and compressed on both sides, and have roots that extend deep into the maxilla (upper jaw). No upper incisors have been found. The unidentified lower front tooth is also enlarged and procumbent. It has three premolars and three molars that decrease in size from front to back. The upper molars are simple and lack a hypocone. The lower molars are relatively broad. Behavior Its large orbits suggest Plesiopithecus was nocturnal. Due to cranial and dental similarities with the aye-aye and signs of wear on the tips of its front teeth, it is thought to have bored holes in wood in search of soft-bodied insects, which likely make up its diet. References Literature cited Prehistoric primate genera Eocene primates Fossil taxa described in 1992