Ephemeroptera from the Venezuelan Guayanas´s Uplands: Families Leptophlebiidae, Euthyplociidae and Oligoneuriidae Author Domínguez, Eduardo Instituto de Biodiversidad Neotropical (IBN), CONICET-Universidad Nacional de Tucumán. Miguel Lillo 205. 4.000 Tucumán, Argentina. E-mail: mayfly @ unt. edu. ar Author Grillet, Maria-Eugenia Laboratorio de Biología de Vectores y Parásitos, Instituto de Zoología y Ecología Tropical, Facultad de Ciencias, Universidad Central de Venezuela, AP 47058, Caracas 1041 - A, Venezuela. E-mail: maria. grillet @ ciens. ucv. ve Author Nieto, Carolina Instituto de Biodiversidad Neotropical (IBN), CONICET-Universidad Nacional de Tucumán. Miguel Lillo 205. 4.000 Tucumán, Argentina. E-mail: mayfly @ unt. edu. ar Author Molineri, Carlos Instituto de Biodiversidad Neotropical (IBN), CONICET-Universidad Nacional de Tucumán. Miguel Lillo 205. 4.000 Tucumán, Argentina. E-mail: mayfly @ unt. edu. ar Author Guerrero, Edmundo Museo del Instituto de Zoología Agrícola Francisco Fernández Yépez, Facultad de Agronomia, Universidad Central de Venezuela, Maracay, AP 4579, Maracay, Venezuela. E-mail: edmundo. guerrero @ miza-ucv. org. ve text Zootaxa 2014 2014-07-04 3827 3 301 317 journal article 5314 10.11646/zootaxa.3827.3.1 54637182-8d50-4ef3-ad88-e3ee10f3d4cd 1175-5326 4920666 8C4821D8-072C-453A-ACF6-6EC539AE96AD 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 ). FIGURES 4–6. Hagnulopsis minuta . 4, male imago, dorsal view; 5, idem, detail of head, with eye bridge; 6 female imago, egg guide, ventral view. 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.