Males have mandibles of similar size to females, but often have disproportionately larger flanges, possibly a result of sexual selection.

[1] The postocular flanges are also visible in the pupae, facilitating diagnosis of the genus.

There appears to be an altitudinal gradient between Platyneuromus and Corydalus in Mexico.

At low elevations (about 500 m), under a semiarid climate, only C. luteus Hagen is found.

At mid elevations (about 750 m), within forested vegetation, both C. luteus and P. soror co-occur, but higher up (ca.