CHROMOSOME STUDIES IN THE JAPANESE VESPERTILIONID BATS:

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Abstract
The karyotype of the vespertilionid bat, M. macrodactylus, was examined in specimens from 2 localities (Akka; 5.female. 1.male., and Ashiro; 4.male.) of Iwate Prefecture, Japan. Eight (4.female. 4.male.) had the consistent karyotype of 2n = 44 (FN [fundamental number] = 52) and no chromosome abnormality was observed. Their karyotypic profiles were almost identical with those described earlier. The remaining two (1.female. 1.male.) evidently revealed unusual chromosome constitution; heteromorphism of the No. 5 pair, which is most probably explainable by a pericentric inversion mechanism, was found in 1 female from Akka, and normal diploid/hyperdiploid mosaicism was observed in 1 male from Ashiro. In the former case no change was found in the chromosome number as well as in the fundamental number (2n = 44, FN = 52), and in the latter case the hyperdiploid cell was featured by 1 extra minute chromosome. The occurrence of interpopulational karyotypic variation is not infrequent in M. macrodactylus. Cytogenetic instability of this species is suggested. Cytotaxonomic relations among the Myotis spp. are discussed in relation to the stability of their karyotypes.

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