Crayfish epibionts branchiobdella sp. and hystricosoma chappuisi (Annelida: Clitellata) in greece

Abstract

Specimens of the three known Greek crayfish species, Astacus astacus (Linnaeus, 1758), Astacus leptodactylus Eschscholtz, 1823 and Austropotamobius torrentium (Schrank, 1803), were collected from seven localities in Greece and were examined for the epibionts of Branchiobdella sp. (Annelida: Clitellata) and the aelosomatid Hystricosoma chappuisi Michaelsen, 1926 and the copepod Nitocrella divaricata (Chappuis, 1923). As a result, three branchiobdellid species, Branchiobdella parasita (Braun, 1805), Branchiobdella pentodonta Whitman, 1882 and Branchiobdella hexodonta Grüber, 1883 were found. This was also the first report of B. pentodonta from Greece as well as H. chappuisi, the latter being found on crayfish gills in one of the localities investigated. Moreover, the current work represents the first documentation of the presence of B. parasita and B. hexodonta in several localities in Greece.