Keroplatidae

The fossil record of the family extends back into the Cretaceous, with the oldest named member, Lebanognoriste known from the Barremian aged Lebanese amber, other Cretaceous species are known from the Spanish, Burmese, Bezonnais, Taimyr and Canadian ambers.

Bioluminescence

Larvae in three genera of keroplatids are bioluminescent, and known as "glowworms", and 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. 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 best-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 may use their lights to attract prey like springtails and other small insects, but their main food is fungal spores.
• Genus Keroplatus – found in Eurasia. Unlike Arachnocampa and Orfelia, the larvae of Keroplatus feed only on fungal spores. Their bioluminescence is believed to have no function and is vestigial.