This is the most common of the emerald damselflies. All emeralds share the characteristic habit of holding the wings well out from the body when at rest (unlike all other damselflies, which fold their wings above the body). It is most often found in well-reeded ditches and over-grown ponds.
All the emerald damselflies rest with their wings half open, as in the photo above. Once the group has been identified, you need to eliminate the rarer species: The Southern emerald has a bi-coloured pterostigma. The Willow emerald (not yet recorded in Norfolk, but may turn up) has a pale brown pterostigma outlined in black. The Scarce emerald is a larger and more robust insect, but identification requires examination of the anal claspers in the male and the ovipositor in the female.Error processing SSI file