The small red-eyed damselfly (Erythromma viridulum) has large, spaced deep red eyes. Both sexes have pale brown pterostigmata. The male has a bronze-black top and blue sides. The sides of the female's thorax are yellow, green or blue. the 2nd and 8th segment of the male abdomen are mostly blue, distinguishing it from the red-eyed damselfly where these are mostly black. Found on ponds, lakes and ditches, it can be associated with floating vegetation such as Hornwort and Water Milfoil.