The following opecoelid digeneans are described from bony fishes of the Weddell Sea: Neolebouria terranovaensis Zdzitowiecki, Pisano et Vacchi, 1993 from Paraliparis antarcticus (Liparididae, new host family); Helicometra rakusai sp. n. from Trematomus loennbergi (Nototheniidae); Stenakron glacialis Zdzitowiecki, 1989 from Racovitzia glacialis (Bathydraconidae) and Pogonophryne marmorata (Artedidraconidae, new host family). H. rakusai sp. n. has terminal oral sucker (similarly to the second Antarctic species, H. antarcticae Holloway et Bier, 1968), but its ventral sucker is considerably smaller than the oral sucker - sucker ratio based on mean diameter 1:0.71-0.87 (mean 1:0.81), that based on width 1:0.65-0.99 (mean 1:0.83). Both other species are recorded in the Weddell Sea for the first time.
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