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  • José H. Leal

Sea Slug Spotlight: The Antilles Oxynoe



The elegant Antilles Oxynoe, Oxynoe antillarum Mörch, 1863, is found along shallow reef areas of the Caribbean and other parts of the tropical western Atlantic, including the Gulf of Mexico. It can grow to about 30 mm (1.2 inches) in length. Antilles Oxynoes have an internal coiled shell. The species feeds on green sea weeds in genus Caulerpa, incorporating the pigment-rich chloroplasts into their own mantle. (Chloroplasts are the sites of photosynthesis in plants.) The resulting green color helps camouflage the slug against its habitat. The Antillean Oxynoe in the photo, crawling on Green Feather Alga (Caulerpa sertularioides), was photographed in its natural habitat in Sarasota, Florida, by sea slug expert Dr. Ángel Valdés (California State Polytechnic University, Pomona), during field work done in cooperation with National Shell Museum staff. Learn more about the species in our Southwest Florida Shell Guide.