Phengodidae is a family of beetles that are commonly referred to as glowworms or railroad worms due to their bioluminescence. However, there are several other synonyms for the word Phengodidae, including the following: firefly beetles, glowworm beetles, branched glowworm beetles, and starry glowworm beetles. All of these names refer to the same family of beetles that are known for their unique ability to emit light in the dark. Whether you call them Phengodidae, glowworms, or firefly beetles, these fascinating insects are sure to capture your attention with their glowing beauty.