A new species of Asthenopus (Ephemeroptera: Polymitarcyidae: Asthenopodinae) from Brazil and Colombia Author Molineri, Carlos Author Cruz, Paulo Vilela Author Emmerich, Daniel text Zootaxa 2011 2750 33 38 journal article 10.5281/zenodo.276675 7ba68779-c4ac-4f7d-989d-dd24a9e033d2 1175-5326 276675 Key to the male imagos of Asthenopus 1 Fore legs 0.73 × or less the length of forewings; penes broad at base, sometimes narrowing apically.................... 2 - Fore legs 0.8 × or more the length of forewings; penes slender from base to apex................................... 3 2(1) Fore legs of male 0.50–0.55 × the length of forewings; marginal intercalary veins of fore wings usually as long as or longer than distance between longitudinal veins..................................................... Asthenopus gilliesi - Fore legs of male 0.60–0.73 × the length of forewings; marginal intercalary veins of fore wings usually shorter than distance between longitudinal veins................................................................ Asthenopus curtus 3(1) Medium sized species (forewing 12 mm ); penes without apical crenulations........................ Asthenopus pictecti - Small species (forewing 7.5–8.6 mm ); penes with subapical crenulations......................... Asthenopus crenulatus