Stonefly larva in a stream

Stonefly live in very fast flowing water where they like to shelter from the current by staying near to rocks and large stones.

The largest species of stonefly can be as big as 35mm long.

Stonefly larva in a stream
Stonefly larvae

Larva moult as they grow, shedding their dark outer skin. The photo above shows a recently moulted younger Stonefly with a darker one ready to moult beside it.

Stonefly nymphal shucks

The photo above shows a nymphal 'shuck' left on a riverside stone as the Stonefly begins life out of water as an adult (shown below).

Adult Stonefly

Stonefly