- two tails - 6 legs - size range: 3/16" - 1"
Stonefly nymphs are structurally similar to mayfly nymphs, except that stonefly nymphs have two tails instead of three. They also appear somewhat less fragile than mayflies, because they possess a more rigid-looking exterior. They are often yellowish and brown or black in color and may be brilliantly patterned.