Hagenulopsis minuta Spieth

(Figs. 4–6)

Hagenulopsis minutus Spieth, 1943: 10; Traver, 1946: 427.

Hagenulopsis minuta; Peters & Domínguez, 2001: 354; Domínguez, Molineri & Mariano, 2009: 43.

Material. Venezuela, Edo Bolívar, Aponwao river, 5º 51’ 02’’N – 61º 27’ 52’’ W, 1340 m , 20/XI/2005, 12 male and 17 female imagos. Small stream near Kavanayén locality, 5º 38’ 08’’N – 61º 40’ 47’’W, 1355 m , 19/ III /2005, 1 nymph. Kamoirán river, 5º37’12’’N – 61º21’47’’W, 1313 m, 23/XI/2005, 1 male imago. Idem, except date 29/ VI / 2007, 9 nymphs. Mareman-Parú river, 5º 44’ 49’’N – 61º 24’ 06’’W, 1308 m, 23/XI/2005, 1 nymph. Idem except date 19/ III /2006, 2 nymphs. Idem, except date 26/ VI /2007, 6 male and 11 female subimagos. Idem, except date 28/ VI /2007, 6 male and 8 female imagos (Malaisse trap). Kaui stream, 5º 28’ 34’’N – 61º 16’ 20’’W, 1196 m , 20/ III / 2006, 3 nymphs. Pacheco stream, 5º 10’ 29’’N – 61º 29’ 51’’W, 1144 m, 21/ III /2006, 1 nymph. Soroape river, 5º 06’ 29’’N – 61º 34’ 40’’W, 935 m, 25/XI/2005, 1 nymph. Small stream in the road to the Paují locality, 4º 36’ 45’’N – 61º 05’ 25’’W, 942 m , 17/ III /2006, 1 nymph. Stream close to the Paují locality, 4º 35’ 11’’N – 61º 30’ 53’’W, 936 m, 17/ III /2006, 1 nymph. Tarotá stream, 5º49’15’’N – 61º25’04’’W, 1324 m, 27/ VI /2007, 5 male and 11 female imagos. Parupa river, 5º40’49’’N – 61º32’39’’W, 1281 m, 19/ III /2006, 13 nymphs. Collectors: EG, MEG and AMO. The specimens were deposited at the MLBV (Venezuela) and IBN (Argentina).

Discussion. This species was reviewed and re-described by Peters & Domínguez in 2001. It is a very characteristic species, due to the presence of a well developed eye bridge (Figs. 4–5) and its small size. The females of this genus also have an egg-guide (Fig. 6).

Distribution. Brazil, Guyana, Surinam, Venezuela and north to Honduras.

Ecology. Imagos were collected along the stream margins, at night, during the rainy season (November 2005 and June 2007); whereas nymphs were collected during rainy and dry seasons (November 2005, March 2006 and June 2007). The rivers and streams flow across the altitude gradient of the Gran Sabana region (936 m – 1355 m), and showed different riparian vegetation (varying from streams partially shaded to rivers not shaded at all). They ranged from small streams (2 m wide) to large rivers (50 m wide), with variable water depths (4.0– 40 cm) and acidic waters (pH = 5). The bottoms of these waterbodies also were heterogeneous: rock-gravel-bottom, gravelsandy bottom, and bed-rock-bottom.