Las especies de Leptohyphidae (Ephemeroptera) de las yungas de Argentina y Bolivia: diagnosis, distribución y claves

the species of leptohyphidae occurring in the yungas cloud forest are studied. eighteen species from five genera are known from the region, including the following new country records: leptohyphes liniti wang, sites & mccafferty, l. maculatus allen, l. nigripennis molineri & zú？iga, l. setosus allen, and tricorythodes hiemalis molineri from bolivia; leptohyphes hirsutus allen & roback and l. petersi allen from bolivia and argentina; and tricorythodes quizeri molineri from argentina. diagnoses, illustrations, and keys to distinguish the treated species are presented. the study of the distribution of these species revealed three different patterns: 1) a group of five species restricted to the yungas; 2) a group of eight species that extend their ranges toward the montane forest in the north; and 3) a group of three species also present in southern areas (central argentina and northern patagonia).