Diphlebia nymphoides is a species of Australian damselfly in the family Lestoideidae,[3] commonly known as an arrowhead rockmaster.

[4] It is endemic to eastern Australia, where it inhabits streams and rivers.

[5] Diphlebia nymphoides is a large, solid-looking damselfly; the adult male is a brilliant blue colour with a black and blue striped tail, while the female has a more muted colouring.

It sits with its lightly tinted wings spread out.

[6]