Dictionary of Human Evolution and Biology

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Leptadapis Gervais, 1876

Adapoid prosimian from the late Eocene to early Oligocene of Europe, belonging to the adapid subfamily Adapinae; five species; formerly included within Adapis, which it antedates. Body mass ranges between 1.5 and 4 kg. Smaller size of orbits suggest diurnal activity. Dental formula: 2.1.4.3/2.1.4.3; dental morphology and cranial-chewing apparatus suggestive of folivory. According to Gingerich, Leptadapis shows evidence of sexual dimorphism cranially and in canine tooth size; this is the first appearance of sexual dimorphism among primates and suggests, based on living mammals, that Leptadapis lived in polygynous groups. Postcrania have been interpreted as providing for slow methodical climbing.

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