Glowworm or glow-worm is the common name for various groups of insect larvae and adult larviform females that glow through bioluminescence. They include members of the families Elateridae, Lampyridae, Phengodidae, and Rhagophthalmidae among beetles; as well as members of the genera Arachnocampa, Keroplatus, and Orfelia among keroplatid fungus gnats.
Four families of beetles are bioluminescent. The wingless larviform females and larvae of these bioluminescent species are usually known as "glowworms". Winged males may or may not also exhibit bioluminescence. Their light may be emitted as flashes or as a constant glow, and usually range in color from green, yellow, to orange. The families are closely related, and are all members of the click beetle superfamily, Elateroidea. Phylogenetic analyses have indicated that bioluminescence may have a single evolutionary origin among the families Lampyridae, Phengodidae, and Rhagophthalmidae; but is likely to have arisen independently among Elateridae.
- Family Elateridae - The click beetles. Of the estimated 10,000 species classified under this family, around 200 species from tropical regions of the Americas and some Melanesian islands are bioluminescent. All of them are members of the subfamily Pyrophorinae, except for one species, Campyloxenus pyrothorax, which belongs to subfamily Campyloxeninae.
- Family Lampyridae - True fireflies. Contains around 2,000 species found throughout the world.
- Family Phengodidae - Usually known as glowworm beetles. Contains around 250 species endemic to the New World. This family also includes railroad worms, which are unique among all terrestrial bioluminescent organisms in producing red light.
- Family Rhagophthalmidae - Contains around 30 species found in Asia. The validity of this family has not been fully resolved. Rhagophthalmidae was formerly considered to be a subfamily under Phengodidae before being treated as a distinct family. Some authors now believe that it should be classified under Lampyridae.
Three genera of fungus gnats are bioluminescent, and known as "glowworms" in their larval stage. They produce a blue-green light. The larvae spin sticky webs to catch food. They are found in caves, overhangs, rock cavities, and other sheltered, wet areas. They are usually classified under the family Keroplatidae, but this is not universally accepted and some authors place them under Mycetophilidae instead. Despite the similarities in function and appearance, the bioluminescent systems of the three genera are not homologous and are believed to have evolved separately.
- Genus Arachnocampa - around five species found only in New Zealand and Australia. The most well-known member of the genus is the New Zealand glowworm, Arachnocampa luminosa. The larvae are predatory and use their lights to lure prey into their webs.
- Genus Orfelia - sometimes known as "dismalites". Contains a single species, Orfelia fultoni, found only in North America. Like Arachnocampa spp., their larvae are predatory and use their lights to attract prey.
- Genus Keroplatus, - found in Eurasia. Unlike Arachnocampa and Orfelia, the larvae of Keroplatus feed on fungi spores. Their bioluminescence is believed to have no function and is vestigial.
- Vadim Viviani. "Terrestrial Bioluminescence: Biological and Biochemical Diversity". Photobiological Sciences Online. Retrieved 11 November 2016.
- Yuichi Oba (2014). "Insect Bioluminescence in the Post-Molecular Biology Era". In Klaus H. Hoffmann. Insect Molecular Biology and Ecology. CRC Press. p. 94. ISBN 9781482231892.
- Vadim R. Viviani; J. Woodland Hastings; Thérèse Wilson (2002). "Two bioluminescent diptera: the North American Orfelia fultoni and the Australian Arachnocampa flava. Similar niche, different bioluminescence systems". Photochemistry and Photobiology. 75 (1): 22–27. doi:10.1562/0031-8655(2002)075<0022:TBDTNA>2.0.CO;2. PMID 11837324.
- Lisa M. Rigby; David J. Merritt (2011). "Roles of biogenic amines in regulating bioluminescence in the Australian glowworm Arachnocampa flava". Photochemistry and Photobiology. 214: 3286–3293. doi:10.1242/jeb.060509.
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- Springbrook Glow Worms Research Centre. All about glow worms [Arachnocampa flava] in the Gold Coast hinterland, Queensland Australia.
- The UK Glow Worm Survey has county-by-county lists of glowworm sites in the UK.
- An introduction to the fireflies and glow-worms of Europe information on the biology, life cycle, bioluminescence and evolution of glow-worms.