Insects - Perla bipunctata
Perla bipunctata
Body length 16mm

The nymph of this stonefly shows the two tail appendages typical of the group. It is found in stony rivers, mainly in N and W Britain. Nymphs are sometimes seen clinging to stones in the water and shed nymphal skins can be found among waterside vegetation from May­July after adult has emerged. Adult's yellowish body is shrouded by smoky wings at rest; two appendages project beyond wingtips.