New records of the cestode genus Pseudotobothrium (Trypanorhyncha : Otobothriidae) from Australian fishes

Pseudotoboithrium dipsacum (Linton, 1897) is reported from the Australian r egion for the first time from various species of teleost fishes and is rede scribed and compared with specimens from other parts of the world. Pseudoto bothrium arii (Bilqees & Sharkaut, 1976) comb. nov. is redescribed based on specimens from the catfish Arius graeffii Kner & Steindacher, 1866 from Qu eensland and is assigned provisionally to the genus Pseudotobothrium. The r elationships of Pseudotobothrium with other otobothriid genera are discusse d. The analysis of anatomical features presented indicates the validity of the genus Pseudotobothrium and that it possesses an atypical heteroacanthou s armature consistent with its position within the family Otobothriidae Dol lfus, 1942. The family Pseudotobothriidae Palm, 1995 is therefore considere d a synonym of Otobothriidae.