A redescription of Rheotanytarsus lamellatus Reiss in all stages (Diptera: Chironomidae) and new records from Argentina Author Tejerina, Eva Gabriela Author Paggi, Analía Constancia text Zootaxa 2009 2315 31 38 journal article 10.5281/zenodo.192014 794f3d2c-5563-4b5b-b4b6-fde085211b25 1175-5326 192014 Key to male adults of Rheotanytarsus from South America [emended from Andersen & Kyerematen (2001) ] 1. Median volsella with apical plate, reaching apex of superior volsella or shorter; wing length < 2 mm ..................... 2 - Median volsella straight and slender with apical subulate setae, extends beyond of superior volsella; wing length> 2 mm . Chile , Argentina ( Reiss 1972, fig. 11 ) .................................................................. Rheotanytarsus globosus Reiss 2. Median volsella with distal setae fused into a rounded plate ....................................................................................... 3 - Median volsella with distal setae fused into a distinct petal-like apical plate. Peru ( Andersen & Kyerematen 2001, figs 9–12 ) ...................................................................................................................... Rheotanytarsus pelus (Roback) 3. Superior volsella oval, apically rounded or pointed, with 5 or 6 dorsal setae .............................................................. 4 - Superior volsella subtriangular, with 4 dorsal setae; wing length c. 1.10 mm . Brazil ( Andersen & Kyerematen 2001, figs 1–8 ) ................................................................................. Rheotanytarsus pantanalensis Andersen & Kyerematen 4. Median volsella reaching apex of superior volsella; superior volsella with 5 dorsal setae, apically rounded; wing length c. 1.40 mm ; Puerto Rico , Argentina ................................................... Rheotanytarsus meridionalis (Johannsen) - Median volsella never reaching apex of superior volsella; superior volsella with 6 dorsal setae, apically pointed; wing length c. 1.31 mm . Chile , Argentina .................................................................. Rheotanytarsus lamellatus Reiss