Common medium stonefly
Enw gwyddonol: Diura bicaudata
As the name suggests, the Common medium stonefly is found in gravelly upland rivers and streams, often on bankside stones and plants. There are 34 species of Stonefly in the UK, which are hard to tell apart.
Species information
Ystadegau
Length: up to 3cmStatws cadwraethol
Common.