Austroagrion cyane, the south-western billabongfly, is a species of damselfly of the family Coenagrionidae. Despite their common name, they have been found not only in south-western Australia, but also in diverse locations across Australia.
Austroagrion cyane are permanent residents of aquatic habitats. They prefer slow-moving water. The species grows to around 2âÂÂ3 cm in length. Females are less common than males and are mostly attracted to ephemeral swamps.