The Journal of the Geological Society of Japan
Online ISSN : 1349-9963
Print ISSN : 0016-7630
ISSN-L : 0016-7630
Rare anomalous dental morphologies found in raccoon dog (Nyctereutes procyonoides) and their implication to dental morphology of fossil mammals
Takehisa Tsubamoto
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2015 Volume 121 Issue 6 Pages 185-189


Two rare anomalous dental morphologies were observed in living Japanese raccoon dogs (Nyctereutes procyonoides viverrinus). One specimen exhibits an extra third root on P3, and the other exhibits a mesiodistally shortened, buccally swelled, and occlusally triangular P4. Analogous morphologies also occur in two Eocene mammalian species, Brachyhyops viensis and Brachyhyops trofimovi (Artiodactyla; Entelodontidae). Brachyhyops viensis has a third root on P3, and B. trofimovi has a mesiodistally shortened, buccally swelled, and occlusally triangular p4. These morphologies of the Eocene species have been considered as diagnostic at the species level. However, the presence of analogous dental morphologies in the anomalous teeth of the raccoon dog imply a possibility that a part of the species diagnoses of B. viensis and B. trofimovi may be not diagnostic characters but anomalous morphologies.

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© 2015 by The Geological Society of Japan
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