Lille Rødøjet Vandnymfe
Brighter, sleeker and daintier than Erythromma najas, with more southern range and later flight season. However, the overlap in range and season is broad, and Erythromma viridulum is rapidly expanding its range northwards into areas once inhabited only by Erythromma najas. Like that species, males often perch far from banks, low in aquatic vegetation, although they are less partial to floating leaves.
Total: 26-32 mm.
Abdomen: 22-25 mm.
Hindwing: 16-20 mm.
Favours eutrophic, standing water, clogged with aquatic vegetation. Typical emergents include algal mats, hornworts (Ceratophyllum), water-milfoils (Myriophyllum) and other plants. May also appear on other emergent vegetation, including floating peatmoss (Sphagnum) in bogs.
From May to September. Most abundant in July and August.