When the Australian field guide says of Nannophlebia risi (Common Archtail), “inhabits streams and rivers, being found amongst gravel”, it’s a fair bet that it is talking about the larvae rather than the adult. This has a quite wide distribution in the eastern half of Austrlalia, missing from the very north of Queensland. The vernacular name,Common Archtail, is very descriptive.
I encountered N. risi first at Booloumba Creek where it was reasonably accommodating. There was a hopelessly distant individual at Seary’s Creek but a third meeting at the Rock Pool near Carnarvon Gorge produced a few more reasonable pictures. I saw just one during FNQ 2022 (though there were lots of N. eludens).