''Erronea adusta'',

common name In biology, a common name of a taxon or organism (also known as a vernacular name, English name, colloquial name, country name, popular name, or farmer's name) is a name that is based on the normal language of everyday life; and is often con ...

the chocolate beauty or tanned/dark onyx cowry, is a

species A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...

sea snail Sea snails are slow-moving marine (ocean), marine gastropod Mollusca, molluscs, usually with visible external shells, such as whelk or abalone. They share the Taxonomic classification, taxonomic class Gastropoda with slugs, which are distinguishe ...

, a

cowry Cowrie or cowry () is the common name for a group of small to large sea snails in the family Cypraeidae. Cowrie shells have held cultural, economic, and ornamental significance in various cultures. The cowrie was the shell most widely used wo ...

, a marine

gastropod Gastropods (), commonly known as slugs and snails, belong to a large Taxonomy (biology), taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, freshwater, and fro ...

mollusk Mollusca is a phylum of protostomic invertebrate animals, whose members are known as molluscs or mollusks (). Around 76,000 extant species of molluscs are recognized, making it the second-largest animal phylum after Arthropoda. The ...

in the

family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...

Cypraeidae Cypraeidae, common name, commonly named the cowries ( cowry or cowrie), is a Taxonomy (biology), taxonomic family (biology), family of small to large sea snails. These are marine (ocean), marine gastropod mollusks in the superfamily Cypraeoidea, ...

, the cowries. This species was formerly regarded as a subspecies of the onyx cowry (''

Erronea onyx ''Erronea onyx'', common name the onyx cowry, is a species of sea snail, a cowry, a marine gastropod mollusk in the family (biology), family Cypraeidae, the cowries. Description The shells of these quite common cowries reach on average of leng ...

'').

Description

The shells of these cowries reach on average in length. The dorsum surface of ''Erronea adusta'' is smooth, shiny and generally dark brown. The base is also dark brown, usually with orange teeth. The interior of the shell is pale purple.

Distribution

This species occurs in the

Indian Ocean The Indian Ocean is the third-largest of the world's five oceanic divisions, covering or approximately 20% of the water area of Earth#Surface, Earth's surface. It is bounded by Asia to the north, Africa to the west and Australia (continent), ...

along East Africa (mainly

Kenya Kenya, officially the Republic of Kenya, is a country located in East Africa. With an estimated population of more than 52.4 million as of mid-2024, Kenya is the 27th-most-populous country in the world and the 7th most populous in Africa. ...

Mascarene The Mascarene Islands (, ) or Mascarenes or Mascarenhas Archipelago is a group of islands in the Indian Ocean east of Madagascar consisting of islands belonging to the Republic of Mauritius as well as the French department of Réunion. Their na ...

Mauritius Mauritius, officially the Republic of Mauritius, is an island country in the Indian Ocean, about off the southeastern coast of East Africa, east of Madagascar. It includes the main island (also called Mauritius), as well as Rodrigues, Ag ...

and

Tanzania Tanzania, officially the United Republic of Tanzania, is a country in East Africa within the African Great Lakes region. It is bordered by Uganda to the northwest; Kenya to the northeast; the Indian Ocean to the east; Mozambique and Malawi to t ...

Habitat

In shallow subtidal water, ''Erronea adusta'' lives in the tropical and subtropical zones.

References

* Verdcourt, B. (1954). ''The cowries of the East African Coast (Kenya, Tanganyika, Zanzibar and Pemba).'' Journal of the East Africa Natural History Society 22(4) 96: 129-144, 17 pls. * Burgess, C.M. (1970). The Living Cowries. A. S. Barnes and Co, Ltd. Cranbury, New Jersey

External links

Biolib

WoRMS

*

adusta Gastropods described in 1810 {{Cypraeidae-stub