Observed by Nicky Butler, as part of the Derwent Valley Bio-blitz
No interactions present.
You really need to see the underside to get with certainty to species. It is likely to be marginalis on mapped distribution, but there are 3 other species in UK that have that pale hind border to the pronotum and two others that don't.
recording wildlife with The Recorder's Year on www.hbrg.org.uk/TRY.html.
Lat/Lng: 54.9395, -1.72576
OS grid ref: NZ176605
Pond dipped from Thornley Woods Pond