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Chromodoris annae is a species of sea slug in the family Chromodorididae. It is found in the tropical central area of the Indo-Pacific region from Malaysia, Indonesia and the Philippines to the Marshall Islands, a region rich in biodiversity and rich in coral, mangroves and seagrasses. C. annae has an elongated body, reaching a maximum length of 5 centimetres (2.0 in), and is coloured in various shades of blue with black spots, its mantle edge and foot being bordered with white and orange-to-yellow lines. The sea slug's diet consists solely of Petrosaspongia, part of the Thorectidae family of sea sponges. It absorbs a noxious chemical from the sponge, storing it in its glands and using it to deter predation. C. annae is generally a docile species, but individuals have been occasionally sighted fighting each other. This C. annae sea slug was photographed in the diving resort of Anilao in Mabini, Batangas, in the Philippines.Photograph credit: Diego Delso