One Erronea Onyx shell, 1 to 1 3/4 inches *****

One Erronea Onyx shell, measuring 1 to 1 3/4 inches.

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Erronea Onyx

Erronea onyx, common name the onyx cowry, are species of sea snail, a cowry, a marine gastropod mollusk in the family Cypraeidae, the cowries.

These are common cowries that grow to an average length of 1 1/3 to 1 1/2 inches in length, with a minimum size 7/8 inch and a maximum size 2 1/5 inches.

The dorsum surface of Erronea onyx is smooth, shiny and generally golden brown, with alternating longitudinal fuzzy bands of translucent bluish and reddish colors (the latin name onyx reflects this).

The base and the margins are dark brown or black, sometimes the teeth are orange.

The living cowries mantle is dark brown, thin, with bluish papillae.

This specie are found in 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.

Erronea onyx lives in tropical and subtropical zones, in shallow subtidal water up to depths of 16 to 82 feet, mainly in muddy areas or sandy sea floor, feeding on algae or coral polyps.

Scientific classification

Domain: Eukaryota

Kingdom: Animalia

Phylum: Mollusca

Class: Gastropoda

Subclass: Caenogastropoda

Order: Littorinimorpha

Family: Cypraeidae

Genus: Erronea

Species: E. onyx

Binomial name: Erronea Onyx