Belostoma discretum Montandon, 1903

Belostoma discretum Montandon, 1903a: Bull. Mus. Nat. Hist. Nat. Paris, 22.

Material examined. Galarza RS: 1 ♀, Yacaré Stream, 16.iv.2013; 1 ♀, Luna Lagoon, sample 2, 17.iv.2013; 1 ♀, Luna Lagoon, sample 3, 17.iv.2013; 1 ♂, Isirí Stream near Luna Lagoon, sample 6, 17.iv.2013; 2 ♂, 4 ♀, Isirí Stream near Luna Lagoon, sample 7, 17.iv.2013 ; 5 ♂, 5 ♀, Galarza Lagoon, sample 1, 18.iv.2013; 2 ♂, 4 ♀, Isirí Stream near Luna Lagoon, 19.iv.2013 . Itatí RS: 1 ♂, 28–31.iii.2014. Laguna Iberá RS: 2 ♂, 1–3.xii.2012. San Nicolás RS: 2 ♀, 13–15.xii.2013.

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

Habitat. Belostoma discretum has been found in lakes, reservoirs, and the vegetated margins of streams and rivers (in association with Pontederia crassipes and Paspalum repens) (Paporello de Amsler 1987; Ribeiro 2005, 2007; Poi de Neiff & Neiff 2006; Almeida et al. 2019). This species has also been taken at lights (Ribeiro 2007; Almeida et al. 2019).

At the INR, B. discretum was collected from the margins with dense floating, emergent, and submerged vegetation in lentic habitats (Galarza Lagoon and Luna Lagoon), and in standing water of lotic habitats (Isirí Stream and Yacaré Stream).

Remarks. This is the first record of B. discretum from INR. This species was previously recorded from Corrientes Province by Montandon (1903a), Torre-Bueno (1906), De Carlo (1930, 1938, 1959), Nieser (1975), Schnack (1976), Lanzer-de Souza (1980), Poi de Neiff (1981), Contartese & Bachmann (1987), López Ruf et al. (2003), Morrone et al. (2004), and Ribeiro (2007).