New species and records for the mayfly families Caenidae, Leptohyphidae and Coryphoridae (Ephemeroptera, Pannota) from Venezuelan Guayana’s Uplands Author Molineri, Carlos Author Grillet, Maria-Eugenia Author Nieto, Carolina Author Dominguez, Eduardo Author Guerrero, Edmundo text Zootaxa 2011 2750 39 50 journal article 10.5281/zenodo.206964 8be3c4b0-eca9-4fa2-b40f-102609149a82 1175-5326 206964 Tricorythodes sp. Material. Venezuela , Estado Bolívar: 1 3 and 6 Ƥ imagos from Mareman-Parú, N 5° 44' 49" – W 61° 24' 6" , 1308 m , 26/VI/2007 , EG, AMO, CA and MEG cols. ( MLBV ); 7 3 imagos same data except date 28/VI/2007 ( MLBV ); 7 Ƥ imagos from Kaku-Parú, N 4° 54' 0" – W 61° 5' 25" , 913 m , 29/VI/2007 , EG, AMO, CA and MEG cols. ( IML ); 20 3 imagos same data except date 28/VI/2007 ( IML ); 6 3 imagos from Tarotá, N 5° 49' 15" – W 61° 25' 4" , 1324 m , 27/VI/2007 , EG, AMO, CA and MEG cols. ( MLBV ). Discussion. As the nymphal characters are necessary to correctly diagnose and describe species in this genus, we prefer not to erect a new species for this material until the immature stages could be known. Ecology. Imagos were collected along the river margins ( Fig. 25 ), at night, and during the rainy season ( June 2007 ). Rivers were uncovered or partially shaded (Kaku-Parú), with acidic waters (pH=5). They were small to medium size streams ( 17–30 m wide; 2nd–3rd order), with bottoms mainly composed of bed-rock and gravels (Kaku-Parú).