There are several bluets in the genus Coenagrion, but all of them have a different-shaped black pattern at the base of the abdomen. In Azure Damselfly (C.puella), by far our commonest species, this takes the form of an elongated U, somewhat resembling a rugby goalpost. Other, much rarer and localised species, have markings bearing resemblance to a chalice, a spearhead or even a spider.
