Rudimentary small upper premolars in the Northern bat, Eptesicus nilssoni (Vespertilionidae, Chiroptera)
Fadeeva T.V., Kruskop S.V.
P. 77-80
A case of presence of the upper small premolar in the genus Eptesicus is being described. Members of this genus were thought to be invariable in having no small premolars in upper toothrows. However, nine partial skulls of northern bats with traces of upper small premolars were excavated from cave deposits of Perm’ Territory. One additional specimen with abnormal dental formula was found in the collection of the Zoological Moscow of Moscow University. The presence of the small premolars in at least some individuals represents a primitive trait which puts E. nilssoni apart from the more advanced members of its genus.
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