[Mechanism of attachment of Dactylogyrus extensus and D. achmerowi (Monogenoidea) to host gills].

The mechanism of adhesion was studied in two species of the genus Dactylogyrus. The muscular system of the disc of both species is described. Data are given on the presence of rudiment of the 8th pair of hooks and on the possible function of this formation as well as the data on the adhesion of the postlarva of D. extensus.