Dictionary of Human Evolution and Biology

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Chiromyoides Stehlin, 1916

Archaic mammal of the late Paleocene and early Eocene of Europe and North America belonging to the family Plesiadapidae; composed of five species. Hypothesized to be descended from a Plesiadapis species. Dental formula: 1-2.0-1.3.3/1.0.2.3; there is uncertainty regarding the upper incisors and canine; there is also dental reduction through time. The incisors are robust, the mandible stout and deep, and the muzzle shortened; these adaptations have suggested to some that this animal filled a niche similar to the aye-aye (Daubentonia) and used its incisors to gnaw away at the bark of trees. Body size estimated to be between 150 and 300 g.

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