The adults and nymphs of Asthenopus angelae new species (Ephemeroptera: Polymitarcyidae) from Argentina, Bolivia, Brazil and Colombia

Abstract

Asthenopus angelae sp. nov. is described based on male and female imagos and associated nymphs from Argentina,<br />Bolivia, Brazil and Colombia. The new species described is similar to A. curtus (Hagen). The nymphal and adult female<br />stages are indistinguishable from those of that species. The male adults can be separated from its congeners by the<br />following characters: penes tubular, with well developed median basal protrusion, curved ventro-medially, with apex<br />acutely projected, furrow separating penial lobe from median basal protrusion reduced or absent; forceps relatively<br />slender; forelegs of male 0.6?0.7 × the length of the forewing; fore tarsal claws slightly widening distally; fore wings with<br />5?11 marginal intercalary veins relatively short.