The Mayfly was skating across a freshwater pond.
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I should just add that there is nothing wrong with this image it's just that you need close up images of the front legs and underneath to separate the species.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Thank you Chris.
Lat/Lng: 52.2, -0.1
OS grid ref: TL3159