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Glow worm is the common name for various different groups of insect larvae and adult larviform females which glow through bioluminescence. They may sometimes resemble worms, but all are insects (Arachnocampa being a fly and all the others being beetles).

Major families

The major families are:



Glow

The glow in the former two groups is a yellow-green colour. The so-called railroad worms in the Phengodidae family have an additional red light at their head. The fly larvae produce a blue-green colour. The glow is produced by different organs in the different families, suggesting they evolved separately, though several other beetle families in the superfamily Cantharoidea exhibit bioluminescence, suggesting a single origin within this lineage, so the Lampyrids and Phengodids do apparently share a common bioluminescent ancestor. The chemical reaction in each case is very efficient; nearly 100% of the energy input is turned into light (compared to the best light-emitting diodes at just 22%).

Purpose of the glow

The purpose of the glow varies. Those adult females which glow do so to attract a male for mating. The Lampyridae larvae are believed to glow as a warning signal (see aposematism) to predators like toads not to eat them as they're mildly toxic. But the Arachnocampa larvae on the other hand glow to attract prey like midge into sticky snare lines for the larva to feed on.

See also

Glowworm groups



Glowworm locations

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Popular culture



References



  • Glow-worms in Te Ara the Encyclopedia of New Zealand


External links




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