Karyotypes of two species of genus Euhadra, Euhadra callizona and Euhadra peliomphala simodae (Bradybaenidae, Gastropoda).

概要

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Somatic chromosomes of two species in the genus Enhadra are studied using air-drying methods. The diploid numbers of both E. callizona and E. p. simodae are 2n=56, and are the same as other Euhadra species described in Inaba's report (1959) and in our previous papers (1984, 1987). From the karyotype analysis of the two species E. callizona is found to have 19 pairs of metacentric and 9 pairs of submetacentric chromosomes, E. p. simodae bears 18 pairs of metacentric and 10 pairs of submetacentric elements. The differences in the karyotypes of these two species suggest that they differ from each other cytogenetically. E. callizona is found to bear a karyotype resembling that of E. dixoni and E. amaliae (1984, 1987); the similarity of form suggests that it is closer to those two species cytogenetically. The karyotype of E. p. simodae is found to have some different elements to that of E. c. hickonis in the medium- sized and the small-sized chromosomes, and is therefore shown to be distinct from E. c. hickonis cytogenetically.
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