any of numerous dull-colored primitive aquatic insects of the order Plecoptera, having a distinctive flattened body shape: a major food source for game fish, especially bass and trout, which makes them popular as models for fishing flies.
Origin of stonefly
First recorded in 1400–50,stonefly is from the late Middle English word ston flie. See stone, fly2
any insect of the order Plecoptera, in which the larvae are aquatic, living beneath stones, and the adults have long antennae and two pairs of large wings and occur near water
Word Origin for stonefly
C15: so called because its larvae live under stones in rivers
