A fairly robust bluet, with a noticeable greenish colour, rather black abdomen and diagnostic pattern on S2 consisting of a black crescent and two dashes. Rather local in much of its range, often in acidic habitats.
Total: 30-33 mm.
Abdomen: 22-26 mm.
Hindwing: 16-22 mm.
Well-vegetated pools and lakes, often acidic and nutrient-poor, such as healthy lakes,. Less critical towards the east, where also found in gravel pits and eutrophic ponds.
End of April to late July. Most abundant in May and June.