A new sighting. Seen while snorkeling in jetty pool. Looks a bit like a snakeskin criton from photos, not confident to name it that as mostly seen on east coast of Australia. Very cool creature, a number of them are on the steps of jetty pool. Wondering if they have come in with the water works boats?
I believe it is a nudibranch found in rock pools
Same object, picture of each side
In shallows at Port Lincoln jetty.