Platynectes, Regimbart, 1879

Gustafson, Grey T., Short, Andrew E. Z. & Miller, Kelly B., 2016, New species of diving beetles in the subgenus Platynectes s. str. from the Guiana Shield (Coleoptera: Dytiscidae: Agabinae), Acta Entomologica Musei Nationalis Pragae 56 (1), pp. 79-102 : 81

Key to the South American Platynectes s. str. species groups

1 Venter mostly pale colored, at most infuscate medially on metaventrite, metacoxal wings, and abdomen. Northern South America. .......................................................................... 2

– Venter dark colored, mostly black to brown except on the prosternum and epipleura. Brazil and Argentina. ................................................................. P. nigerrimus species group

2 Venter not infuscate, reddish-orange throughout. ........... P. submaculatus species group

– Venter distinctly infuscate, usually with metaventrite, metacoxal wing, and abdomen medially infuscate. .............................................................. P. agallithoplotes species group