[Specification of the systematic position of Botulus alepidosauri (Trematoda, Hirudinellidae)].

The detailed description of Botulus alepidosauri Guiart, 1938 from Thunnus obesus, Alepisauris ferox, A. brevirostris in tropical East Atlantic is presented. The described species is compared with literary data. Some changes were introduced into the taxonomic position of the genus Botulus, considered as a representative of the subfamily Botulinae in the family Hirudinellidae.