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