| Somatochlora, Downy emerald, Epitheca, Hine's emerald dragonfly, Dorocordulia|Corduliidae Wikipedia
The insect family Corduliidae contains the emerald dragonflies or green-eyed skimmers. These dragonflies are usually black or dark brown with areas of metallic green or yellow, and most of them have large, emerald-green eyes. The larvae are black, hairy-looking, and usually semiaquatic.
Members of this family include the baskettails, emeralds, river cruisers, sundragons, shadowdragons, and boghaunters. They are not uncommon and are found nearly worldwide, but some individual species are quite rare. Hine's emerald dragonfly (Somatochlora hineana), for example, is an endangered species in the United States.
Some genera:Archaeophya – urflys
Cordulia – American emeralds
Dorocordulia – little emeralds
Epitheca – baskettails
Helocordulia – sundragons
Hemicordulia - emeralds
Metaphya - emeralds
Neurocordulia – shadowdragons
Procordulia - emeralds
Somatochlora – striped emeralds
Williamsonia – boghaunters