The chromosome number published earlier for this species was 2n = 38 for female . We could confirm that the karyotype contained two pairs of metacentrics, one pair of submetacentric and 16 acrocentric chromosomes. C-banding of M. extradentata is shown in Figure 1a; in detail: in the pericentric regions of all chromosomes apart from the largest acrocentric chromosome, large- or medium-sized C-positive regions were observed. Intercalary C-positive regions were also discovered in two pairs of acrocentrics. In the majority of acrocentrics and in all metacentrics small dot-like C-positive regions were identified in terminal regions of long (=q)-arms. The most impressive C-banding pattern was discovered in a pair of large submetacentrics. Their short arms consisted of large proximal C-positive regions, flanked by a small C-negative region and the small dot-like C-positive region on the tip of the chromosome arm; an identical dot-like C-positive region was also present on the end of its long arm.