Abstract
Studied was geographic variation in 12 skull measurements of 24 samples of Rhinolophus ferrumequinum (Schreber, 1774) from south-eastern Europe. Morphological principal component 1 (69.5% of variance explained) was highly size related. Morphological principal component 2 (10.6% of variance explained) correlated significantly only with interorbital constriction. Most of the interlocality variation was due to size, which increased clinally from the north-west to the south-east. Clustering of character means produced two clusters. The ranges of overlap of condylocanine length between the two size-related clusters showed no evidence of the existence of two clearly defined populations. July precipitation levels best explained the size variation observed. I propose that R. f. martinoi be considered a synonym of R. f. ferrumequinum.
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