Thometrema magnifica (Szidat, 1954)

Gonocercella magnifica Szidat, 1954

Thometrema portoalegrensis Amato, 1968 Material deposited: MACN-Pa 606 (type material and new voucher material), MLP.

Hosts: Hypostomus plecostomus (Linnaeus) [= Plecostomus plecostomus (Linnaeus)], Hypostomus commersoni Valenciennes [= Plecostomus commersoni (Valenciennes)] (type host not assigned), ( Siluriformes: Loricariidae).

Localities: Uruguay River in front of Santo Tomé, Corrientes Province and La Plata River in front of Buenos Aires City (type locality not assigned); Paraná- Guazú River**, Entre Rios Province; Canal Yrigoyen, Isla Talavera, Buenos Aires Province.

Site of infection: Stomach, swim bladder.

References: Szidat (1954), Gibson & Bray (1979), Kohn et al. (1983), Lunaschi & Sutton (1995), Arredondo (2013).

Remarks: New host and locality records. Szidat (1954) indicated the presence of Thometrema magnifica in Plecostomus plecostomus, but according to Froese & Pauly (2016) and Almirón et al. (2015) this species is not present in continental waters of Argentina. Probably, due to similarity among them, the record of Hypostomus plecostomus by Szidat (1954) corresponds to Pterygoplichthys anisitsi which inhabits the Paraná River basin.