Glischropus tylopus,the first known old-world bat with an X-autosome translocation

Summary Glischropus tylopus shows an X-autosome translocation in which a small acrocentric chromosome has been transferred to the X. The diploid number is 30 for the females and 31 for the males. RBG banding shows that in the late replicating X of the female only the original X replicates late, the autosomal part replicates early, showing the same pattern as the corresponding autosomal Y₂ of the male. In the X chromosome, a heterochromatic band separates the autosomal from the gonosomal sequences.23 January 1987I am very grateful to Prof. R.A. Pfeiffer for giving me the opportunity to work at the Department of Human Genetics.My stay in Malaysia was supported by a grant of the DAAD.