Extensive karyotype variability of African fish genus (Cyprinodontiformes).

Karyotypes of 65 species of the genus Peters, 1868 were reviewed and of those 35 examined first time. The results of present study have shown that fishes of the genus possessed highly diverse karyotypes. The diploid chromosome number (2n) ranged from 16 to 50. The most frequent 2n was 2n = 36 (in 35 species) while the second one 2n = 38 (in 13 species). Proportion of biarmed chromosomes varied from 0 to 95% between species. Diploid chromosome number variability apparently exists as a result of chromosomal fusions or fissions and extensive karyotypic formula alterations promoting by inversions. Multiple sex chromosomes of system XXXX/XXY type were found only in karyotypes of 5 species. The extensive karyotype variability, unusual for teleosts, of genus can be likely associated with the characteristics of its life cycle and inhabiting under unstable environment of East African savannah temporal pools.