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In this paper, we present for the first time data on karyotype analysis of   leeches of the genus Baicalobdella (Piscicolidae) parasitizing Lake Baikal   endemic cottoid fishes. Both mitotic and meiotic chromosomes are described.   Leech testisacs were processed by a “shaking-blotting” technique, and   chromosomal preparations were stained with water-based fuchsine. Diploid and   haploid chromosome sets demonstrated 2n=34 and n=17, respectively, with   maximal chromosome length of 1.5-3.0 μm. Comparative karyotype analysis of   two ecological forms of Baicalobdella leeches revealed differences in   chromosome numbers and its morphology. Previously studied Baicalobdella   torquata (Grube, 1871) parasitizing Baikal amphipods had smaller diploid and   haploid sets (2n=32, n=16). In addition to numerical superiority, differing   patterns of chromosome size gradation and presence of satellite elements were   found in the karyotype of piscine Baicalobdella leeches. This confirms the   systematic position of the Baikal cottoid leech parasite as a separate   species, validating the original name Baicalobdella cottidarum sensu Dogiel,   1957

archives of biological sciences

Karyotype characterization of the endemic piscine leech from Lake Baikal with vindication of Baicalobdella cottidarum Dogiel, 1957 (Piscicolidae, Hirudinea)