The arrow points to the reef platform in the south of the island where I snorkeled and saw some gorgonians. Below are some other critters I saw there.
This gloomy octopus caught my eye almost immediately after I hit the water.
I saw a number of ctenophores (or comb jellies) in the water. I have seen them before at Cottesloe. So I didn't spend too much time on them.
While I was swimming around the reef overhangs where the gorgonians live, I spotted a huge colony of Zoanthus praelongus. This is the second time I saw this species. I first saw them at Cottesloe. This colony probably was three times as large as the one I saw at Cottesloe.
Later, while exploring the shallow seagrass bed, I saw these southern bailers (Melo miltonis). They were quite large, about 25 cm or so in length.
And on the way back to the shore, I came across this delicate sea anemone (Heteractis malu).
What's different about this one is that there was so much purple coloration on its short, stubby tentacles. Most of the other delicate sea anemones around it had just purple-tipped tentacles.
I found this sea star which I think is a Patiriella brevispina when snorkeling in the east side of the island.
The upper surface seems to be covered by some kind of plates with small spines (left). The sea star has orange tube feet (middle) and even an orange stomach (right)!