Dictionary of Human Evolution and Biology

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Notharctus Leidy, 1870

Adapoid prosimian from the middle Eocene of North America, belonging to the notharctid subfamily Notharctinae; four species. Descended from the earlier Cantius. Dental formula: 2.1.4.3/2.1.4.3; dental morphology suggests folivory; sexually dimorphic in canine size. Unlike that of living prosimians, the mandible is fused. Body mass estimated to range between 4 and 7 kg. Cranial morphology similar to the living Lemur, postcrania reminiscent of both Propithecus and Lepilemur, although Notharctus is more heavily built; Lepilemur is frequently used as a model for this genus. Locomotion appears to be leaping in the trees and quadrupedalism when on the ground.

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