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The Common blue (Enallagma cyathigerum) – also known as the common bluet or northern bluet – is a cerulean blue colour with black markings, while the female has a larger variation in colouring. It can be easily mistaken for the azure damselfly (Coenagrion puella), but on the back and the thorax, the common blue damselfly has more blue than black. Also, the second segment of the thorax has a distinctive spot with a line below connecting to the third segment.
Common bluet damselflyCommon bluet damselflyCommon blue damselflyCommon blue damselflyCommon blue damselflyCommon blue damselflyCommon blue damselflyCommon blue damselflyCommon blue damselflyCommon blue damselflyCommon blue damselflyCommon blueCommon bluet damselfly