This is an observation from the remote Kimberley region, WA apparently offshore, I'm not sure it matches I. trissorma which online has a SE Australian distribution. Looking online on the ALA there are several observations of Idaea (genus) from the Kimberley, none of which seem to me to match this sighting. There are a few sitings of I trypheropa from NW WA on the ALA which doesn't, to me, seem to match this sighting either.