First record of Branchiobdella pentadonta Whitman, 1882 (Аnnelida) in Belarus

Our paper describes the registration of crayfish worms on the noble crayfish Astacus astacus from the Dorgomysl River (Mstislavsky district, Mogilev region, Belarus). A total of 101 branchiobdellidans were collected from eight A. astacus individuals. Each individual was separated and identified by key morphological characters, including body size and shape, jaw apparatus structure, and the number of teeth. The found branchiobdellidans were identified as Bran- chi obdella pentadonta , which is the first record of this species in Belarus.