Often occurs with the smaller, sleeker and smaller-spotted Leucorrhinia dubia. May easily be confused without close examination, but with binoculars the entirely yellow leading edge of the wing can sometimes be made out.
Total: 31-38 mm.
Abdomen: 23-28 mm.
Hindwing: 27-31 mm.
Prefers acidic, oligotrophic lakes, tarns and bogs, often in forest. Also occasional breeds in more nutrient-rich, richly vegetated habitats. Unlike Leucorrhinia dubia, is able to co-exist with rather high fish densities.
From mid April to early August. Most abundant from May to mid June.