Dictionary of Human Evolution and Biology

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Plesiolestes (Palaechthon) Jepsen, 1930

Archaic mammal known from the middle to late Paleocene of North America belonging to the Plesiadapiformes family Palaechthonidae; two to four species depending on authority. Known only from dentition and mandibular remains. Dental formula probably 2.1.3.3/2.1.3.3; enlarged anterior dentition, enlarged third molars, low-crowned molars all suggestive of herbivorous diet, probably frugivory. Mandible unfused, as in modern prosimians. Body mass of the species ranges between 150 and 600 g. Some authors include Talpohenach and Torrejonia in this genus.

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