Rhagophthalmidae

The Rhagophthalmidae are a family of beetles within the superfamily Elateroidea. Members of this beetle family have bioluminescent organs on the larvae, and sometimes adults, and are closely related to the Phengodidae (glowworm beetles), though historically they have been often treated as a subfamily of Lampyridae, or as related to that family. The most recent evidence is that they are the sister group to the Phengodidae, in a clade that also contains the family Omalisidae, and somewhat distantly related to Lampyridae, whose sister taxon is Cantharidae. Whatever their relationships may be, Rhagophthalmidae are distributed in the Old World, and little is known of their biology. Females are usually wingless and look like larvae, but have an adult beetle's eyes, antennae and legs; in the genus Diplocladon, they resemble larvae even more, with small light organs on all trunk segments. Larvae and females live in soil and litter and are predaceous; males may be attracted to lights at night.