Hyptiasmus laevigatus, Kossack, 1911

Dronen, Norman O. & Blend, Charles K., 2015, Updated keys to the genera in the subfamilies of Cyclocoelidae Stossich, 1902, including a reconsideration of species assignments, species keys and the proposal of a new genus in Szidatitreminae Dronen, 2007, Zootaxa 4053 (1), pp. 1-100 : 61

H. laevigatus Kossack, 1911

Type host. Tufted duck, Aythya fuligula (Linnaeus) (Syns. Anas fuligula Linnaeus ; Fuligula fuligula [Linnaeus]) ( Anseriformes : Anatidae ).

Type locality. Germany; specific type locality unknown.

Additional hosts. Velvet scoter, Melanitta fusca (Linnaeus) (Syn. Oidemia fusca Linnaeus ); common scoter, Melanitta nigra (Linnaeus) (Syn. Oidemia nigra Linnaeus ); common eider, Somateria mollissima (Linnaeus) ; long-tailed duck, Clangula hyemalis (Linnaeus) (Syn. Nyroca hyemalis [Linnaeus]) ( Anseriformes : Anatidae ); and species of Anas Linnaeus and Anser Brisson—Kossack (1911) ; Yamaguti (1971); ferruginous duck, Aythya nyroca (Güldenstädt) ( Anseriformes : Anatidae )— NHMUK on-line Host-Parasite Database.

Additional localities. Europe, Republic of Kazakhstan and Siberia—Yamaguti (1971). Bulgaria—NHMUK on-line Host-Parasite Database.

Previously proposed synonyms. Hyptiasmus tumidus Kossack, 1911 ; H. coelonodus Witenberg, 1923 — Bashkirova (1950).

Remarks. No oral or ventral sucker described—Kossack (1911); Witenberg (1923, 1926) and Bashkirova (1950).