by Gwilym S. JONES (l) and Harlan D. WALLEY (2) Quarante-quatre anomalies dcntaires de Zapus (Rodentia, Zapodidae), comprenant des dents surnume'raires semblables aux pr£molaires, des pr&nolaires disparues, des promolaires rabougries et des pointes supplementaires, sont docrites. Only a few cases of tooth anomalies have been reported in North American zapodids. Krutzsch (1953) reported bilateral supernumerary teeth posterior to the upper tooth row in Zapus princeps from Gunnison County, Colorado and Klingener (1964) reported the lack of premolars (P4's) in a Zapus hudsonius from Oakland Co., Michigan. Klingener (1964) further reported a Napaeozapus insignis from Menominee County, Michigan with a left P4 and Wrigley (1972) reported a N. insignis from Quebec with small bilateral supernumerary teeth posterior to the upper third molars (M3's), and also 15 N. insignis with small cusplike structures on the lingual side of the upper molars. We are here reporting additional Zapus tooth anomalies. A Zapus hudsonius (HDW 1345) from DeKalb, DeKalb County, Illinois has an unusual supernumerary anomaly (Fig. 1). In both the right and left upper tooth rows, a small premolar-like tooth emerges lingually from between the M2 and M3. The teeth are very similar to the premolars of the same specimen, showing
Mammalia - International Journal of the Systematics, Biology and Ecology of Mammals – de Gruyter
Published: Jan 1, 1976
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