Redescriptions of two echinostomes from freshwater fishes, with comments on Singhia Yamaguti, 1958 and Caballerotrema Prudhoe, 1960 (Digenea : Echinostomatidae)

The type-species of Singhia and Caballerotrema (Digenea: Echinostomatidae), parasites of freshwater fishes which have previously been assigned to the subfamily Singhiinae Yamaguti, 1958, are redescribed. One of the specimens of the type-series of Caballerotrema brasiliense Prudhoe, 1960 was identifi ed as C. aruanense Thatcher, 1980. C. arapaimense Thatcher, 1980 is conside red a species inquirenda. Himasthla piscicola Stunkard, 1960 is transferred to Caballerotrema as C. piscicola n. comb. The generic diagnoses of Singhi a and Caballerotrema are redefined and Singhia is re-allocated to the Echin ostomatinae Looss, 1899, the Singhiinae becoming a synonym of the latter.