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 Fittkauneuria adusta Pescador & Edmunds Fittkauneuria adusta Pescador & Edmunds 1994: 268 . The genus was described for two species, one of them known from nymphs and male imagos, and the other only from nymphs. The species collected in this study is known only from nymphs. Material . Venezuela , Edo Bolívar , Kamoirán river , 5º37’12’’N – 61º21’47’’W , 1313 m , 23/XI/2005 , 1 nymph. Tarotá stream, 5º49’15’’N – 61º25’04’’W , 1324 m , 27/ VI /2007 , 3 nymphs. Specimens were deposited at the MLBV ( Venezuela ) and IBN ( Argentina ). Discussion . The nymphs of F. adusta can be characterized by the abdominal gills, in which the dorsal lamellae is ovate, and the ventral tuft is vestigial. From the distribution of its two species, it appears that the genus is restricted to northern Amazonia and Venezuelan highlands. Distribution . Brazil and Venezuela . Ecology . Individuals were collected during the rainy season, in partially shaded small and medium size streams, both having a rock-bottom and acidic waters (pH=5).