New data on morphology and taxonomy of Tschertkovilepis and Drepanidotaenia (Cestoda : Hymenolepididae) representatives, parasites of wild and domestic geese in Slovakia

New data are presented on the morphological variability of four hymenolepid id species from wild and domestic geese in Slovakia, namely Tschertkovilepi s barrowensis (Schiler, 1952) comb. n., Tschertkovilepis krabbei (Kowalewsk i, 1895) Czaplinski et Jarecka, 1967, Tschertkovilepis setigera (Froelich, 1789) Spasskii et Spasskaya, 1954 and Drepanidotaenia lanceolata (Bloch, 17 82) Railliet, 1892. On the basis of original findings and data obtained from the literature, th e separation of avian hymenolepidids with antiporal position of female gona ds into two genera is proposed. Drepanidotaenia Railliet, 1892 is character ised by 8 diorchoid rostellar hooks and numerous internal longitudinal musc le bundles and Tschertkovilepis Spasskii et Spasskaya, 1954 by 10 diorchoid rostellar hooks and numerous internal muscle bundles. The latter genus, wh ich has recently been synonymized with Microsomacanthus Lopez-Neyra, 1942, is proposed to become valid and to comprise the species: T. setigera (Froel ich, 1789) Spasskii et Spasskaya, 1954, T. krabbei (Kowalewski, 1892) Czapl inski et Jarecka, 1967, T. ardeae (Fuhrmann, 1906) comb. n., T. barrowensis (Schiller, 1952) comb. n., T. bilateralis (Linstow, 1905) comb. n., T. sig nachiana (Kurashvili, 1950) comb, n, and T, teshekpukensis (Dronen, Martin et Taylor, 1994) comb, n. Accordingly, the genus Microsomacanthus is propos ed to be characterised by 10 diorchoid rostellar hooks, 8 internal muscle b undles and other characters.