Platynectes, Regimbart, 1879

Short, Andrew Edward Z., Benetti, Cesar J. & Gustafson, Grey T., 2020, New records of Platynectes (s. str.) diving beetles from South America with description of two new species (Coleoptera: Dytiscidae: Agabinae), Acta Entomologica Musei Nationalis Pragae 60 (2), pp. 437-447 : 445

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

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

– Venter primarily dark colored, mostly black to brown except on the prosternum and epipleura and in some species, the abdomen as well. Brazil. ........................... 3

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

3 Abdomen darkly colored. ................................................. ........................................ P. nigerrimus species group

– Abdomen lightly colored. ................................................. ....................................... P. ornatifrons species group