Tenagobia schadei Lundblad, 1929

Tenagobia schadei Lundblad, 1929: Ark. Zool., 20A, 23.

Material examined. Galarza RS: 1 ♀, Galarza Lagoon, Hermanos Fleita pier, 17.iv.2013 ; 1 ♂, 4 ♀, flood-prone areas in Hermanos Fleita field, 18.iv.2013. Itatí RS: 3 ♀, Corriente River, 26.ix.2003 ; 3 ♀, Estancia El Dorado, artificial pond, 28°45.60’S, 58°7.23’W, 28.iii.2014 . Laguna Iberá RS: 2 ♂, Iberá Lagoon, Fraga pier, 28°31’50.00’’S, 57°11’13.68’’W, 3.xii.2012 ; 1 ♂, light trap, 28°32’48.65’’S, 57°11’48.015’’W, 14.ii.2018; 4 ♂, 2 ♀, Miriñay channel, 28°34’13’’S, 57°10’13’’W, 16.ii.2018 ; 1 ♀, route 40, roadside pond, 17.ii.2018. San Ignacio RS: 4 ♂, 2 ♀, Camping Monterrey, Aguará pedestrian path, short walkway, marshes, 27°52.152’S, 56°52.884’W, 2.iii.2015 ; 2 ♂, vehicle path, roadside marshland and ditches, 27°54.551’S, 56°53.254’W, 3.iii.2015; 15 ♂, 14 ♀, Camping Monterrey, ditches, 27°52.610’S, 56°52.690’W, 3.iii.2015 ; 1 ♀, Camping Monterrey, Aguará pedestrian path, artificial well, 27°52.286’S, 56°52.767’W, 4.iii.2015 ; 4 ♂, road of “ Las 600” in front of Monte Grande, marshlands, 27°50.991’S, 56°53.543’W, 5.iii.2015 ; 1 ♀, old pine tree forest of “ Las 600”, artificial channel, 27°51.834’S, 56°54.285’W, 5.iii.2015 ; 6 ♂, 31 ♀, light trap, 27°49’26.52’’S, 56°50’52.26’’W, 16.xi.2018; 1 ♀, vehicle path, roadside marshland and ditches, 27°49’26.64’’S, 56°50’52.38’’W, 17.xi.2018; 1 ♀, vehicle path, roadside ditches, 27°54’10.14’’S, 56°53’14.10’’W, 17.xi.2018; 1 ♀, vehicle path, roadside ditches, 27°54’0.24’’S, 56°53’6.42’’W, 17.xi.2018; 3 ♂, 2 ♀, Camping Monterrey, Aguará pedestrian path, marshland, 27°52’14.10’’S, 56°52’59.70’’W, 18.xi.2018 ; 3 ♂, 4 ♀, Camping Monterrey, Aguará pedestrian path, long walkway, marshes, 27°52’14.58’’S, 56°52’59.76’’W, 18.xi.2018 . San Nicolás RS: 8 ♂, 9 ♀, marshland next to the house for the rangers, 15.xii.2013; 10 ♂, 10 ♀, light trap in the ranger station, 13–15.xii.2013. Yahaveré RS: 3 ♀, Concepción de Yaguareté Corá, route 22, roadside marshes, 28°23’16.3”S, 57°54’25.6”W, 5.xi.2015; 1 ♂, Campo Angelita, roadside marshes, 28°25’40.9”S, 57°49’12.3”W, 6.xi.2015 ; 1 ♂, Caaby Aguilar, marshes, 28°24’03.4”S, 57°51’31.3”W, 8.xi.2015 ; 1 ♂, Concepción de Yaguareté Corá, house for researchers, light trap, 28°23’25.7”S, 57°53’15.9”W, 6–7.xi.2015 . On the road to Itatí RS : 2 ♂, Mercedes Department, Pay Ubre Grande Stream, Provincial Route 29, 25 km NW Mercedes, 25.ix.2003 .

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

Habitat. Tenagobia schadei has been found in the margins of ditches (with aquatic vegetation), pools (with or without aquatic vegetation; including rocky pools by the waterfall), ponds (with or without aquatic vegetation), lakes, lagoons (with aquatic vegetation), marshes (with aquatic vegetation), channels, streamlets (without aquatic vegetation), streams (with very slowly running water) and rivers (Nieser 1975, 1977; Poi de Neiff 1984; Melo & Nieser 2004; Pelli et al. 2006). This species seems to prefer lentic habitats or habitats with slowly running water, with scarce to moderately dense aquatic vegetation (Bachmann 1981). It has also been taken at lights (Nieser 1975, 1977).

Tenagobia schadei was previously recorded from Iberá in association with Leersia hexandra, Egeria najas, Salvinia biloba, Pontederia azurea and Cabomba caroliniana (Poi de Neiff 1984, 1993, 2003). During the present study, it was collected from unshaded margins with dense floating, emergent and submerged vegetation (mainly Azolla filiculoides, Pontederia azurea, P. crassipes, P. cordata, Hydrocleys nymphoides, Nymphoides indica, Egeria densa and Salvinia biloba) in lentic habitats (ponds, Galarza Lagoon, Iberá Lagoon, ditches, marshes, marshlands and flood-prone areas) and lotic habitats (Miriñay channel, artificial channels and Corriente River) in standing or slowmoving water. This species was also collected in standing or slow-moving water along the margins without aquatic vegetation of Pay Ubre Grande Stream, in shaded places. Additional specimens of this species were taken at lights in Concepción de Yaguareté Corá, San Ignacio Ranger Station, Laguna Iberá Ranger Station and San Nicolás Ranger Station.

Remarks. Tenagobia schadei is one of the most widespread species of water bugs in the INR. This species was very often collected together with T. incerta . It was recorded from INR by Bachmann (1979, 1981).