Revision of larvae of the dobsonfly genus Platyneuromus van der Weele (Megaloptera, Corydalidae, Corydalinae)

Platyneuromus van der Weele (Megaloptera, Corydalidae, Corydalinae) is a dobsonfly genus endemic to Mexico and Central America with three valid species. Its larvae or hellgrammites are exclusively aquatic, feed on aquatic invertebrates or – sometimes – small vertebrates, and inhabit lotic ecosystems, from small mountain streams to large tropical rivers, typically clean and well oxygenated. Until the present study only Platyneuromus soror (Hagen) had its larva described. Recently, dobsonfly larvae were collected in Agua Azul waterfalls, Chiapas, Mexico, a previously recorded site for the geographically restricted Platyneuromus reflexus Glorioso & Flint. Herein, we associate those larvae to the latter species through DNA barcoding comparison with adults from the site. We describe the larva of P. reflexus for the first time, as well as the larva of Platyneuromus sp. A, a probable undescribed species from mountainous areas of western Mexico; both are compared with the previously described P. soror. We also provide a key for the identification of known larvae of this poorly known dobsonfly genus