Mauritia histrio
A common cowry with a pale brown shell and grey spots.
Mauritia histrio, called the harlequin cowry or stage cowry, is a sea snail, a marine gastropod mollusk belonging to the cowry family Cypraeidae. These fairly common, large shells typically measure 40 to 55 mm in length, though adults can range from 20 mm up to 88 mm. The shell’s basic color is pale brown, dotted with many grey round spots on the upper surface and edged with several dark brown marginal spots. The underside is mostly white or pale brown, featuring a wide aperture with well-developed darker teeth that are longer and stronger on the outer side. In the living animal, the mantle is transparent and covered with short papillae. This species closely resembles *Cypraea arabica* and *Mauritia eglantina*.
Its range spans the Indian Ocean and western Pacific Ocean, including Aldabra, Chagos, East Africa, Kenya, Madagascar, the Mascarene Basin, Mauritius, Mozambique, Réunion, the Seychelles, Tanzania, northwestern Australia, and the Philippines. *Mauritia histrio* inhabits tropical shallow waters, is nocturnal, and spends the day hidden under rocks, large blocks, or deep crevices in coral reefs.
Quick Facts
- Genus
- Mauritia (gastropod)
- Species
- histrio
Facts from the source article.
Lore & Background
Mauritia histrio is a nocturnal species, hiding during the day under rocks, large blocks, or in deep crevices in coral reefs. The shell reaches an average length of 40 to 55 mm, with a maximum recorded size of 88 mm and a minimum adult size of 20 mm. Its basic color is pale brown, adorned with many grey round spots on the dorsum and several dark brown marginal spots along the edges. The base is mainly white or pale brown, featuring a wide aperture and well-developed darker teeth that are longer and stronger on the outer side. In the living mollusk, the mantle is transparent with short papillae. The species is quite similar to Cypraea arabica and Mauritia eglantina. It has been described under several synonyms, including Cypraea histrio, Cypraea reticulata, Cypraea amethystea, and others, and includes two recognized subspecies: Mauritia histrio histrio and Mauritia histrio westralis.
Reader's Guide
Mauritia histrio holds a place in the study of cowries as a relatively common and widespread species across the Indian Ocean and Western Pacific. Its notable size range—from a minimum adult length of 20 mm to a maximum of 88 mm—and its distinctive pale brown shell with grey spots and dark marginal spots make it a recognizable member of the Cypraeidae family. The species is often compared to Cypraea arabica and Mauritia eglantina, indicating its place within a complex of similar cowries. The transparent mantle with short papillae observed in living specimens adds to its biological interest. The existence of two subspecies, Mauritia histrio histrio and Mauritia histrio westralis, reflects geographic variation within its range. Its nocturnal habits and preference for hiding under rocks or in coral crevices during the day are characteristic of many cowries. The species has accumulated numerous synonyms over time, including names from Linnaeus, Gmelin, and Röding, illustrating the historical taxonomic attention it has received. For collectors and malacologists, Mauritia histrio represents a typical example of a tropical cowry with a broad distribution and variable shell features.
Did You Know?
- The maximum recorded shell length of Mauritia histrio is 88 mm.
- The living mollusk has a transparent mantle with short papillae.
- It is nocturnal and hides during the day under rocks or in coral crevices.
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