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Taxa
Sialis lutaria (Linnaeus, 1758)
SUMMARY
Sialis lutaria is dark brown to black in colour. It has four membranous wings all unpatterned, uniformly brown in colour with dark veins. Its wings are held roof-like over its abdomen. The antennae are shorter than the forewings. It has a body length of 10mm and a wingspan of 22-30mm.
This is the commonest species of megalopteran in the British Isles, found throughout England, Scotland and Wales, but apparently local in Ireland.