Rheumatobates crassifemur crassifemur Esaki, 1926

Rheumatobates crassifemur Esaki, 1926: Ann. Mus. Nation. Hungar., 149–153.

Material examined. Galarza RS: 2 ♂, 3 ♀, overflow channel in Hermanos Fleita field, 18.iv.2013.

General distribution. Panama, Colombia, Brazil, Bolivia, Paraguay, Argentina (Moreira et al. 2011b).

Habitat. This species has been found in slow to moderately fast-flowing streams with or without aquatic vegetation, rivers, ponds, lagoons and lakes (Hungerford 1954; Mazzucconi & Bachmann 1995; Aristizábal-García 2002; Souza et al. 2006; Molano-Rendón et al. 2008; Moreira et al. 2011c; Dias-Silva et al. 2013). Rheumatobates c. crassifemur has also been collected on quiet brackish waters of pools at the mouth of streams emptying into the sea in Panama (Drake & Hottes 1951).

At the INR, this species was collected from the margins of overflow channels with dense emergent and submerged vegetation.

Remarks. This is the first record of R. c. crassifemur from INR. This species was previously recorded from Corrientes Province by Bachmann (1966b), Mazzucconi & Bachmann (1995), and Mazzucconi (1999).