Abstract
The maximum number of cheek teeth in the rodent families Cricetidae and Muridae is normally 12. Instances of a number exceeding 12 are rare but there are several on record (Tokoro, Zool. Mag. Tokyo, 55: 72,1943; Johnson, Jour. Mamm., 33:70, 1952). A specimen of Baiomys musculus at hand has 14 cheek teeth, four in each maxilla and the normal three in each mandible. This is the first example of a bilateral increase in molariform teeth that I have seen in thousands of specimens of cricetids that I have examined. The specimen, University of Michigan Museum of Zoology number 100239, is one of several trapped in arid …
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