Hydrops caesurus Scrocchi et al., 2005

Type locality. “Isla Paloma, Canal de los Jesuitas, Rio Paraná, Itapúa, Paraguay.”

Distribution. Known from Argentina, Brazil, and Paraguay, along the Paraguay River drainage (Plt. 290A). In Brazil,recorded in the Pantanal and Cerrado (Plt. 290A) at low elevations (Plt. 290B). Observed in the field in rivers and seasonally flooded areas (Scrocchi et al., 2005; Duleba et al., 2015).