Acanthostomum gnerii Szidat, 1954

Material deposited: MACN-Pa 599 (type and new voucher material).

Hosts: Rhamdia quelen (Quoy & Gaimard) [= Rhamdia sapo (Valenciennes)] (type host), Pimelodella laticeps Eigenmann ( Siluriformes: Heptapteridae), Cyphocharax gilbert (Quoy & Gaimard) [= Pseudocurimata gilberti (Quoy & Gaimard)] ( Characiformes: Curimatidae).

Life cycle: IH1 Heleobia parchappii (Pilsbry) (Prosobranchia: Hydrobiidae); IH2 Cnesterodon decemmaculatus (Jenyns) ( Cyprinodontiformes: Poeciliidae), Odontesthes bonariensis (Valenciennes) [= Basilichthys bonariensis (Valenciennes)] ( Atheriniformes: Atherinopsidae), Astyanax sp., Jenynsia multidentata (Jenyns) [= Jenynsia lineata (Jenyns)], Oligosarcus sp. (= Acestrorhamphus sp.); FH Rhamdia quelen, Pimelodella laticeps .

Localities: Paraná River near Rosario City (type locality), Santa Fe Province; Chis-Chis and Chascomús Lagoon (Chascomús) and Cantera (quarry) Los Talas (Berisso), Buenos Aires Province.

Site of infection: Stomach (Lunaschi, 1986), anterior part of intestine.

References: Szidat (1954), Lunaschi (1986), Ostrowski de Núñez & Gil de Pertierra (1991), Gil de Pertierra & Ostrowski de Núñez (1995).