Erronea onyx
Erronea onyx, common name the onyx cowry, is a species of sea snail, a cowry, a marine gastropod mollusk in the family Cypraeidae, the cowries. Description. The shells of these quite common cowries reach on average of length, with a minimum size of and a maximum size of . The dorsum surface of "Erronea onyx" is smooth, shiny and generally golden brown, with alternating longitudinal fuzzy bands of translucent bluish and reddish colors (hence the Latin name "onyx"). The base and the margins are dark brown or black, sometimes the teeth are orange. In the living cowries mantle is  dark brown, quite thin, with bluish papillae. Distribution. This species occurs the Indian Ocean on the coasts of Aldabra, the Comores, Kenya, Madagascar, Mauritius, Mozambique, Réunion, the Seychelles, Tanzania and in the Pacific Ocean along East China, Thailand, northern Australia, Indonesia, Philippines, Palau Islands and Solomon Islands. Habitat. "Erronea onyx" lives in tropical and subtropical zones, in shallow subtidal water up to depth, mainly in muddy areas or sandy sea floor, feeding on algae or coral polyps. Subspecies. What used to be called "Erronea onyx adusta", is now accepted as "Erronea adusta".