Abstract
The genus Genarchella Travassos, Artigas & Pereira, 1928 is reinstated for some species from South American fishes previously attributed to Halipegus Looss, 1899. Aspects of the morphology of G. genarchella Travassos, Artigas & Pereira, 1928 and G. parva Travassos, Artigas & Pereira, 1928 are redescribed. Astyanax bimaculatus, Moenkhausia doceana, Oligosarcus robustus and Salminus maxillosus are recorded as new hosts of G. parva, and H. cryptorchis Mane-Garzon & Gascon, 1973 and H. szidati Yamaguti, 1971 [= G. tropica of Szidat (1954)] are listed amongst new synonyms of this species. Aspects of the morphology of Thometrema magnifica (Szidat, 1954) and T. overstreeti (Brooks, Mayes & Thorson, 1979) are redescribed. T. rioplatense Lunaschi, 1989 is considered a synonym of T. overstreeti. New host-records of T. overstreeti are Pimelodus maculatus and Rhamdia sp. G. genarchella of Hamann (1986) is considered as synonym of T. overstreeti. Paravitellotrema Watson, 1976, Caballeroiella Lamothe-Argumedo, 1977 and Quadripaludus Jimenez, Guajardo & Briseno, 1981 are considered synonyms of Genarchella. The features distinguishing Halipegus, Genarchella and Thometrema Amato, 1968 are discussed.
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