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There are only 3 species and they are not that hard to tell apart with a quick check of the genitalia. It can even be done from a close-up photo of the underside of the abdomen tip.
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My Flickr photos...
I'll try to look even more closely next time I see one.
Lat/Lng: 53.781180847196, -2.6202392578125
OS grid ref: SD592318
wetland nature reserve