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As far as I am aware, lutaria is the common species of Alder fly in the UK, found by still, as well as flowing, water. I think that is what WLR meant (unless lutea is an alternative name?).
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Yes Correction Sialis lutaria = Mud Alderfly
there are circa 3 British Species ( S.nigripes first recorded in 1977 despite being overlooked for a century ) and Sialis fuliginosa
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