What happened?

I'm going to put this out as a reader challenge while I do some research myself. I came across this somewhat disturbing spectacle in a local bit of bushland. The spider (which was on a vertical trunk as it happens) appears to be a huntsman which has been/is being consumed by some sort of parasitic fungus. It certainly makes me shudder. Apologies for the photo quality, I only had my happy snap camera with me at the time.

This one's done...

I'd heard about these and seen photos, but last night was the first time I'd seen the Blue Mountains form of the Sydney Crayfish (Euastacus australasiensis)... truly an astonishing colour.

Sydney Crayfish, Euastacus australasiensis