Hydrops martii (Wagler in Spix, 1824)

Type locality. Rio Itapecuru, state of Maranhão, Brazil .

Distribution. Known from Brazil, Colombia, Ecuador, Guyana, Peru, and Venezuela, in Amazonian forests (Plt. 291A). In Brazil, widespread in Amazonia (Plt. 291A) at low elevations (Plt. 291B). Observed in the field in lakes, rivers, and flooded forest (Scartozzoni, 2010).