Status: - Restricted to central and south eastern England, with outposts in Devon, Wales and Yorkshire.
Habitat: - Favours almost any body of water that supports water lilies and plants with broad floating leaves. It will also set up territories on waters with large algal blooms.
Flight period: - Mid May to mid August.
General: - This insect has a strong flight. The males spend much of their time out over the water, setting up territories over floating vegetation. Males are often seen sitting on algal blooms as well as floating leaves and the upright stems of succulent plants such as Marsh St John’s-Wort (Hypericum elodes).
Egg-laying is performed in tandem but some males just before becoming completely submerged, release the female to continue egg-laying alone under water. Egg-laying is not restricted to succulent floating plants but has been observed on the stems of Water Crowfoot (Ranunculus aquatilis).