Nematodes occurring in the Antarctic bony fishes are reviewed, and keys based on morphological features are presented. Five valid species: Ascarophis nototheniae Johnston et Mawson, 1945; Cystidicola beatriceinsleyae (Holloway et Klewer, 1969); Dichelyne fraseri (Baylis, 1929); Hysterothylacium aduncum (Rudolphi, 1802); Paranisakiopsis weddelliensis Rocka, 2002, and one unnamed form, Capillaria (Procapillaria) sp., have been reported from the Antarctic teleosts. Also, larval anisakids, in the adult stage parasites of marine mammals, birds and fishes, occur commonly in the Antarctic and Subantarctic bony fishes. They belong to Contracaecum spp., Anisakis spp., Pseudoterranova decipiens (Krabbe, 1878) and Hysterothylacium aduncum.
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