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Also known as Red-lined Flabellina and Sonic the Hedgehog Nudibranch. Usually found on Halocordyle disticha, its preferred food source. They feed on hydroids, coral, sponges and anemones.
Found singly or in pairs on coral and rocky reefs, in sand and rubble areas. Widespread, circumtropical.
I photographed this nudibranch at a depth of about 12m, at a dive site off the coast of Big Ligid Island, Samal, Philippines.