The Club Tailed Dragonfly
This is in my opinion a reasonably rare dragonfly in the United Kingdom and it gets its very appropriate name from the obvious swollen tip on its abdomen. This is present in both the sexes with subtle differences in the anal appendages.
It is confined to the southern half of the United Kingdom in a few specific sites. This species prefers slow flowing rivers where they like to breed, although adults can be encountered far from water.
One of their strongholds is on the River Thames at Goring but there are also relatively small satillite populations on the River Kennet, which has been my only hunting ground for this dragonfly to date. I have heard of them being sighted on the River Blackwater but this is as yet unconfirmed.
Perching adults are a very rare site. The adult male is dull green and black and I have yet to see one, but I am still searching. The adult female is yellow and black and closely resembles an immature specimen (see above).
It is these immature Club Tailed Dragonflies that you are more likely to encounter on days of an emergence. On such days they can be quite abundant but you must make the most of the opportunity, it may not arise again. Once they disperse finding one can be a very difficult task indeed.