Phyllidia haegeli

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Phyllidia haegeli is a shell-less sea slug in the family Phyllidiidae. It has a blue back that darkens toward the edge, with four black lines running lengthwise and three ridges topped with tall yellow bumps. The edge of the mantle has vertical rows of smaller tubercles with dark centers and broken black lines between them. The rhinophores (sensory organs) are yellow. This species lives in the Indo-Pacific, including Lombok (Gili Trawangan), Bali, and Anilao in the Philippines, and it feeds on a sponge. It was first described from a reef off Trawangan in Lombok, Indonesia. It can look similar to Phyllidia coelestis, Phyllidia varicosa, and Phyllidia picta. It was previously named Fryeria haegeli.