Further study on the karyotypic evolution in the genus rhinolophus (Mammalia: Chiroptera)

Abstract

A detailed karyotype comparison among R. cornutus cornutus, R. ferrumequinum nippon and R. luctus formosae are made on the basis of relative length, G-and C-band patterns. The data presented here suggest strongly M.SM-1 and 2 in R. f. nippon were formed by centric fusion of four of five small A-autosome pairs such as those in A-23-25, 27 and 28 of R. c. cornutus, while occurrence of M·SM-3 in the former was caused by pericentric inversion of a small A-pair such as that in A-24 or 25 of the latter, confirming the assumption described in our previous report (Andō et al. 1980a). On the other hand, appearance of the secondary short arms of A-autosomes in R. nippon is attributable to the Gband material added to the telomeres of A-autosomes. Addition of heterochromatin is considered to have taken place also in the short arm of the ST-X chromosome in R. f. nippon, and to have brought about the morphological difference of the Y chromosome within Rinolophus. © 1983 Taylor & Francis Group, LLC.