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.