Caliagrion is a monotypic genus of damselflies belonging to the family Coenagrionidae. The single species of this genus, Caliagrion billinghursti, is commonly known as a large riverdamsel, and is endemic to south-eastern Australia, where it inhabits slow-flowing rivers and ponds.
Caliagrion billinghursti is a large damselfly; the male is coloured bright blue with black, while the female is yellow and black.
Etymology The genus name Caliagrion is derived from the Greek καλός (kalos, "beautiful" or "good") combined with Agrion, a genus name derived from the Greek ἄγριος (agrios, "wild").
In 1901, René Martin named the species billinghursti, an eponym honouring its collector, Farncombe Lovett Billinghurst (1859-1937), of Alexandra, Victoria.
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