Steinovelia vinnula (Drake, 1951)

(Fig. 22)

Velia vinnula Drake, 1951a: Rev. Entom., 375–376.

Paravelia vinnula: Polhemus, 1976: J. Kansas Ent. Soc., 513.

Steinovelia vinnula: Polhemus & Polhemus, 1993: J. New York Entomol. Soc., 397.

Material examined. Laguna Iberá RS: 2 ♀, route 40, roadside pond, 17.ii.2018. San Ignacio RS: 1 ♀, Camping Monterrey, Aguará pedestrian path, long walkway, flood-prone areas, 27°52.213’S, 56°52.977’W, 2.iii.2015; 1 ♀, Reserva Privada Don Luis, Monte Don Luis, ditches, 27°52.015’S, 56°54.914’W, 5.iii.2015; 1 ♀, Reserva Privada Don Luis, Monte Don Luis, roadside ditches, 27°52’0.60’’S, 56°54’54.18’’W, 16.xi.2018; 1 ♂, Camping Monterrey, Aguará pedestrian path, long walkway, marshes, 27°52’14.58’’S, 56°52’59.76’’W, 18.xi.2018. Yahaveré RS: 1 ♀, Caaby Aguilar, pond, 28°24’10.4”S, 57°51’17.5”W, 6.xi.2015; 1 ♂, 2 ♀, Caaby Aguilar, marshes, 28°24’03.4”S, 57°51’31.3”W, 8.xi.2015.

General distribution. Brazil (Moreira et al. 2020). Argentina: Corrientes (this work).

Habitat. Knowledge regarding this species is based on only three specimens, including the holotype. Nothing is known about its habitat associations except that it was found in Lago da Marchantaria in Amazonas State, Brazil (Rodrigues & Álvarez Arango 2019) .

At the INR, S. vinnula was found in marshes (Fig. 13), flood-prone areas, roadside ditches and ponds, in open water surface beside emergent vegetation, in shaded places.

Remarks. The American genus Steinovelia includes four species (Moreira et al. 2020). Previously to this paper, only S. virgata had been recorded from Argentina (Coscarón 2017). The collection of S. vinnula from INR extends the known range of this species from southeast Brazil to northeastern Argentina. The shape of the posterior femora, enlarged in S. vinnula and slender in S. virgata, unambiguously differentiate these two species.