Several of these surfacing in a dark, heathland pool.
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Hi and welcome to iSpot!
Thanks for the extra information. I suspect I have a picture of a female, as well, then. Do they look very different?
[By the way, it's best to put info like that as a comment, and agree with the ID, in future]
My Flickr photos...
Lat/Lng: 53.92239259254, -0.84580510854721
OS grid ref: SE758479
Forestry Commission plantation being returned to wooded heathland