Status: - Rare in the UK but can be locally abundant. Limited to only a few sites.
Habitat: - Rivers with slow to moderate flow rates with mud or silt substrate.
Flight period: - Second week in May to last week in June.
General: - Adults emerge synchronously, early to mid May and rapidly disperse, some up to 10 km. They can be found feeding in woodland clearings.
Riverside banks with good tree cover are preferred, males selecting a perch from which to launch forays in search of food and / or females. There seems to be a total lack of aggression towards any other species of dragonfly present at the river. Copulation appears to take place away from the immediate egg-laying site.
Females appear suddenly flying low over a suitable sluggish parts of the river, they are alone. As they over fly the water they drop eggs, occasionally just touching the surface presumably to wash away any of the remaining eggs.