Emeralds (Corduliidae)
Species
These dragonflies are usually black or dark brown with areas of metallic green or yellow, and most of them have large, emerald-green eyes. There are five genera in the Corduliidae family in Europe. They are Cordulia (1 species), Somatochlora (7 species), Epitheca (1 species), Oxygastra (1 species) and Macromia (1 species).
 
Four species have been recorded in Britain.
  • Downy Emerald: scarce and local, mainly in S England
  • Brilliant Emerald: rare and local in SE England, and W Scotland
  • Northern Emerald: rare and local in Scotland
  • Orange-spotted Emerald: extinct in Britain