Crossword Genius

Firefly's effulgent larva (4-4)

Ross

I believe the answer is:

glow-worm

(Other definitions for glow-worm that I've seen before include "Beetle whose larva-like wingless females emit light" , "Beetle whose wingless females are partly luminous" , "Shining beetle" , "Kind of beetles that emit greenish light" , "Beetle whose female bears luminescent green organs" .)

I've seen this clue in the Sydney Morning Herald.
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