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Firefly Larva or Net-Winged Beetle? How to Tell

A strange, flattened, segmented larva found indoors was identified via BugGuide.net as either a firefly (lightning bug) larva or a net-winged beetle larva. The definitive field mark: check the underside of the last abdominal segment for a distinct, pale, light-producing organ—present only in firefly larvae.

Firefly larva ventral view showing light organ

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