Common around ponds and reed-beds throughout the British Isles. In Hampshire locally common in suitable habitat, especially along the coast between Southampton and Gosport, and in north-east Hampshire; apparent increases in recent years may be due to increased observer coverage, but it remains very rare on the Isle of Wight. Wingspan male 18-19 mm, female 22-24 mm. Females nocturnal, males fly in the afternoon. Unmistakable. Larva feeds on Common Duckweed, Bulrush and Unbranched Bur-reed, living mostly underwater.