Etymology
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stonefly (n.)

mid-15c., from stone (n.) + fly (n.). So called because the larval forms abound under stones of steams.

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Definitions of stonefly

stonefly (n.)
primitive winged insect with a flattened body; used as bait by fishermen; aquatic gilled larvae are carnivorous and live beneath stones;
Synonyms: stone fly / plecopteran
From wordnet.princeton.edu