There area a goodly number of dragonfly species, the males of which develop a powdery blue coating on various parts of their bodies, most notably the abdomen. Since the coating is called pruinosity after the bloom that develops on the skin of fruit, we have affectionately taken to referring to such species as prunes, for short.
This is just about the commonest prune of the set. Here is a comparison of the four prunes to be found in the UK, plus two Europeans, which will hopefully help clarify the main identification differences.
The other common confusion is between immature male and female specimens, which are painfully similar. This comparison chart should help clarify.
- black pterostigma
- generally greenish eyes
- mature ♂ – pruinose abdomen with black tip
- stockier build than the similar O. albistylum