The Azure Damselfly (Coenagrion puella) is a species of damselfly found in most of Europe. It is remarkable for its distinctive black and blue colouring. Adult male Azure damselflies have a head and thorax patterned with blue and black. They have an azure blue abdomen patterned with black markings. The marking on the second segment of the abdomen is U-shaped, separated from the segment's narrow terminal black band.
The Blue-tailed damselfly, Ischnura elegans, adult male has a head and thorax patterned with blue and black. They have a largely black abdomen with very narrow pale markings where each segment joins the next except segment eight is entirely pale blue.