Mauritia histrio
Mauritia histrio, common name the harlequin cowry or the stage cowry, is a species of sea snail, a cowry, a marine gastropod mollusk in the family Cypraeidae, the cowries.

Description
These quite common large shells reach on average  of length, with a maximum size of  and a minimum adult size of . The basic color of the shell is pale brown, with many grey round spots on the dorsum surface and several dark brown marginal spots on the edges. The base is mainly white or pale brown, with a wide aperture and well-developed darker teeth, longer and stronger on the outer side. In the living mollusk the mantle is transparent, with short papillae. Mauritia histrio is quite similar to Cypraea arabica and Mauritia eglantina.

Distribution

This species is distributed in the Indian Ocean and Western Pacific Ocean, along Aldabra, Chagos, East Africa, Kenya, Madagascar, the Mascarene Basin, Mauritius, Mozambique,  Réunion, the Seychelles, Tanzania, North West Australia and Philippines.

Habitat
Mauritia histrio lives in tropical shallow water. It is nocturnal, hiding during the day under rocks, large blocks or in deep crevices in coral reefs.

Synonyms
Cypraea histrio Gmelin, 1791 (basionym)
Cypraea reticulata Martyn, 1784
Cypraea amethystea Linnaeus, 1758Cypraea histrio Gmelin, 1791
Cypraea oculata  Röding, 1798Cypraea undosa Röding, 1798
Cypraea arlequina Mörch, 1852Arabica westralis Iredale, 1935
Mauritia (Arabica) histrio var. duploreticulata Coen, 1949

Subspecies
 Mauritia histrio histrio Gmelin, 1791
 Mauritia histrio westralis Iredale, 1935