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Metamorphoses: simple North American Families: 9 North American Species: 537 |
Plecoptera
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Description: Stoneflies are small to medium insects, flattened, soft-bodied, and dull-coloured. They have four membranous wings which are usually gray or pale brown. The front wings are elongate and narrow and the hind wings are slightly shorter. At rest the wings are held flat over abdomen. The antennae are long with many segments. Stoneflies have long cerci projecting from the end of the abdomen. They have chewing mouthparts. |
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| Comments: Stoneflies are found near streams or rocky lake shores. The nymphs are aquatic and found under stones or bottom debris in clean streams and lakes. A few species live in underground water bodies, including wells. Adults do not fly well and are usually found near water. On warm days in the fall, winter and spring, adults may be found resting on bridges, fence posts and other objects near the streams where the nymphs develop. | |||
Families in this Order |
 Perlidae: Common stoneflies Size: 20 to 40 mm |
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