Abstract
Chromosomal architecture of Megaderma lyra, a microchiropteran bat collected from South India, was analysed for the first time using G- and C-banding techniques. The diploid number, FN value and categorisation of autosomes were in confirmity with the previous report which utilised a North Indian population for analysis. However, variations with regard to the nature of the X and Y chromosomes were encountered in these two populations. The important feature noticed in the G-banded karyptype is the G-positive nature of thesatellite of the 8th pair of hetero-morphic autosomes and centromeric region of 5th, 6th, 7th and 18th autosomal pairs. The C-banded chromosomes revealed extensive occurrence of C-positive blocks of heterochromatin. The amount of heterochromatin (44.76%) measured for M. lyra is the highest for any bat studied till today. Present observations implicate pericentric inversion and addition or deletion of heterochromatin as causative agents for inter-population sex chromosome variations. It is also proposed that the high amount of consitiutive heterochromatin possibly had a role in the phylogenetic differentiation of this species.
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