Dictionary of Human Evolution and Biology

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Microsysops Leidy, 1872

Archaic mammal of the Eocene of the Rocky Mountain region of North America belonging to the plesiadapiform family Microsyopidae; consists of six to eight species, depending on authority. This genus has a cranial arterial pattern similar to that of living primates, but the auditory bulla does not emanate from the petrosal bone and this, along with other traits, has led some workers to assign this genus to the order Insectivora. Dental formula: 2.1.3.3/1.0.3.3. Estimated body masses for the different species range from 400 g to 2 kg.

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