We found five different kinds of nudirbanchs on a rocky shore at Pulau Ubin that we visit too rarely.
Hypselodoris nudibranch with pink gills (Hypselodoris sp.) seems seasonally common on Northern shores like Changi.
Our last visit here was two years ago, in Dec 2010! Pulau Ubin has beautiful rock formations including amazing 'fluted' rocks. You can read more about these unique and fascinating rock formations on November's Ubin Stories blog and Joseph Lai's eart-h.com. These beautiful natural rocks are encrusted with all kinds of marine life.
Onyx cowries (Cypraea onyx) were also there and colourful crabs clambered over everything.
Rose nudibranchs (Dendrodoris fumata). I saw a tiny Sponge nudibranch (Ategema spongiosa). The rest of the team found Thordisa villosa and Hoplodoris nodulosa which are well camouflaged among the encrusted rocks.
pink sponges (Haliclona cf baeri). It seems to have been eating the sponge, see the chomped parts where the nudi was.
blue spotted flatworms (cf Pseudoceros indicus) and one purplish flatworm on some ascidians.
Ball tip corallimorphs that have retracted their tentacles when out of water. They come in a variety of colours.
Crown sea star (Asterina coronata) can have. One is dull coloured and blends in with the dull rock. But even the bright orange one is hard to spot among the colourful animals that encrust the rocks.
blue feather star while the rest saw more and took better photos of them. They also saw sea fans with the many different kinds of animals that live in them.
Nest mussels (Musculista senhousia). Many tiny anemones were embedded in the 'nest' created by the mussels. While several kinds of Drills (Family Muricidae) were roaming the nests, probably eating the mussels.
Pygmy squid (Ideosepius sp.).
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