Nice sighting! It does mostly look like aequalis but I'm not completely convinced these are not just a yellow form of another species. Was there more than one inflorescence?
I think it was just the one Tobias. I'll take the good camera and have another look at it. It was nearby to many Diuris pardina and stood out like a sore thumb.
Ah I see. Good to see those photos from a different angle. Not quite sure something just seems a little different but I can't come up with a good reason for why this isn't aequalis. I'm always a bit wary with these all yellow diuris, as there can also be yellow forms of other species but lets go with aequalis here. To be sure, it would be nice to know there was a whole colony of yellow individuals, not just the odd plant
I've subsequently heard from Dan about this plant, and he says that he's known of this individual for quite a few years now but that he's only ever seen the one and that its often seeing growing among lots of other semilunulata. On this basis, I think best to go with Diuris sp. and likely a yellow form of D semilunulata.