Dictionary of Human Evolution and Biology

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Family of archaic fossil mammals belonging to the order Plesiadapiformes. Known from the middle to late Paleocene of North America; three genera, although some workers think that all forms should be collapsed into one genus. With the exception of one crushed cranium, this family is known only from jaw fragments and teeth. In the past these forms were mistaken for bats. Dental formula: Incisors are enlarged, but the molars differ from any other plesiadapiform, the lower molars most resembling extant bats. For this reason it has been suggested that they were nectarivorous. Estimated body mass of genera ranges from 40 to 200 g.

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