Many of these nymphs swimming around in stream.
No interactions present.
I susect you are correct with Ecdyonurus i have also just found this site (http://mostlyaboutmayflies.wordpress.com/2011/08/08/tips-for-identifying...) which seems to suggest E. dispar or E. torrentis if only i had a pick of the underside!
Hi Ben, I believe you can go to species from a photograph but it's all about gills etc which is beyond my ability.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
mustn't lose your head
Time flies like an arrow, but fruit flies like a banana.
5 Years pro aquatic ecologist.
Claim to fame: Discovered Dikerogammarus haemobaphes in UK.
Lat/Lng: 53.6747, -2.396
OS grid ref: SD739198