Hydrops caesurus Scrocchi, Ferreira, Giraudo, Avila and Motte 2005

Hydrops caesurus Scrocchi, Ferreira, Giraudo, Avila and Motte 2005. Type locality: Departamento Itapúa, Isla Paloma, Canal de los Jesuitas, Paraguay.
Hydrops triangularis bolivianus— Williams and Couturier 1984
Hydrops triangularis — Álvarez and Aguirre 1995

Distribution. Northeast Argentina and Paraguay. The distribution is disjunct from other members of the genus. It inhabits temperate and subtropical latitudes. Type locality: Departamento Itapúa, Isla Paloma, Canal de los Jesuitas, Paraguay.

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