Belostoma elongatum Montandon, 1908

Belostoma elongatum Montandon, 1908: Ann. Mus. hist.-nat. hung., 299.

Material examined. Itatí RS: 1 ♂, 28–31.iii.2014. Laguna Iberá RS: 5 ♂, 5 ♀, Fernández Lagoon, 11.xii.2014. San Ignacio RS: 1 ♂, Reserva Privada Don Luis, Monte Don Luis, roadside ditches, 27°52.015’S, 56°54.914’W, 5.iii.2015. San Nicolás RS: 2 ♂, 13–15.xii.2013. Yahaveré RS: 1 ♂, 1 ♀, Medina Lagoon, 13.xii.2014; 2 ♂, Trin Lagoon, 12.xii.2014.

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

Habitat. Belostoma elongatum has been found in ditches, ponds (densely vegetated), marshes, lakes, lagoons (densely vegetated), and in quiet edges of streams and rivers (Armúa de Reyes & Estévez 1999; Armúa de Reyes et al. 2006; Poi de Neiff & Neiff 2006; Ribeiro 2007; Armúa de Reyes & Kehr 2008). This species has also been taken at lights (Almeida et al. 2019).

At the INR, specimens were collected from the margins of the Iberá Lagoon (Estévez & Armúa de Reyes 2003; Estévez et al. 2003). During the present study, specimens were collected from the margins with dense floating, emergent, and submerged vegetation in unshaded lentic habitats (Fernández Lagoon, Medina Lagoon and Trin Lagoon), and in standing water of lotic habitats. It was also collected at the margins of a shaded roadside ditch without aquatic vegetation.