I founnd this little insect, about one centimeter long, on my car windscreen when I parked near Waskerley beck at Wolsingham in Weardale yesterday. I'm pretty sure its a willowfly Leuctra geniculata, a member of the family of needleflies within the order Plecoptera, the stoneflies.
Needleflies' name comes from the way they tend to fold their wings tightly around their abdomen, making the insect appear slender and pointed.
It's a common insect but an encouraging sign of good water quality in the beck - stoneflies' aquatic larval stages need clean, well oxygenated water and have a low tolerance of pollutants.
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