High Quality Content by WIKIPEDIA articles! Rhagophthalmidae is a family of beetles within the larger Elateroidea group that include click-beetles. Members of this beetle family have bioluminescent organs on the larvae and are closely related to the Phengodidae (glowworm beetles) and Lampyridae (fireflies), and were often included in one of these families as a subfamily—Rhagophthalminae. Towards the end of the 20th century, they were increasingly seen as a distinct family. But they might be the only reasonably close living relatives of the mysterious fireflies of genus Pterotus, and could eventually end up in a Lampyridae subfamily with these. They were mainly included in the Phengodidae for having similar adaptation for displaying glowing lights. However, this seems to be due to convergent evolution. If they indeed belong in the Lampyridae, they are related to a group of families that have either a distinct type of flashing lights (Luciolinae) or rely exclusively or nearly so on pheromones for communication (the others).