Rhyacophila dorsalis - Sandfly

The sandfly is one of the small number of sedge flies whose larvae are free swimming rather than case builders.

The larvae live under stones in fast and medium-paced rivers; they forage for food as dusk descends.

Winged adult

The adults, of medium size, appear in autumn and are mainly seen flying in the evening, but as they rarely occur in large numbers anglers find that a specific imitation of this sedge fly is not necessary.

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