|Common Name||South-western Billabongfly|
|Genus/Species||Austroagrion cyane (Selys, 1876)|
|Apparently common in southern Western Australia but also occurring sporadically in south-eastern South Australia to just inside Victoria. Populations seem to be predominantly coastal. Note that the distribution map is automatically generated from ALA records, many of those points include Austroagrion watsoni (which was separated from A. cyane in 1982) and possibly other Austroagrion species. The true known distribution extends from the South Australian–Victorian border to around Perth.|
|Habitat||These inhabit a wide range of still water, including swamps, and can also be found by sluggish water.|
|Description||These are small damselflies of which the males have black and bright blue markings. The females have more black at the end of the abdomen and are generally a paler blue.|
|Similar Species||Austroagrion watsoni are similar (also having a pale line across the back of the head) but
male Austroagrion cyane has half an extra blue segment near the end of the abdomen.
Females of these two species are very difficult to tell apart and require details of the facial markings.|
Ischnura heterosticta and Pseudagrion microcephalum are also generally similar but have different markings behind the eyes.
|Males mostly perch horizontally on emergent aquatic vegetation. I first saw this species in 2010 at Piccaninnie Ponds Conservation Park in South Australia just a few kilometres from the Victorian border, although I only saw one female and one or two males. Three years later I discovered a thriving population in Long Swamp, part of Discovery Bay Coastal Park in Victoria.|