stonefly

Any of numerous insects of the order Plecoptera, having two pairs of membranous wings and long antennae, the nymphs of which often live under stones in streams. Adult and larval stoneflies are used as fishing bait.

any insect, of the order Plecoptera, having a flattened body; they are used by fishermen as bait

primitive winged insect with a flattened body; used as bait by fishermen; aquatic gilled larvae are carnivorous and live beneath stones