Plecoptera of the Outer Hebrides


Stoneflies are a primitive group of aquatic insects believed to be distantly related to cockroaches. There are 34 species in Britain and of these 29 have been recorded in Scotland. The word Plecoptera means "fan-shaped wing", which describes the way the hind wing is folded below the forewing in the adult. The photograph of Isoperla grammatica (below) shows the long antennae and twin tail filaments which are characteristic of stoneflies. All species of Plecoptera are intolerant of water pollution and are therefore important as bio-indicators of water quality



Mottled Grasshopper