Hysterothylacium magnum (Smedley, 1934) Deardorff & Overstreet, 1981

Synonyms: Contracaecum magnum Smedley, 1934; Thynnascaris magnum (Smedley, 1934) Margolis & Arthur, 1979

Comments: as noted by McDonald & Margolis (1995), Margolis & Arthur (1979) listed a previous Canadian record as Thynnascaris magna . Deardorff & Overstreet (1981) considered the genus Thynnascaris to be a junior synonym of Hysterothylacium and listed the species as H. magnum n. comb. In agreement with McDonald & Margolis (1995) the validity of this species requires re-assessment (see also Comments on H. melanogrammi below).

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Hosts: Apodichthys flavidus; Leptocottus armatus; Ophiodon elongatus Distribution: Pacific

Record: Smedley 1934