''Cytharopsis butonensis'' is a species of

sea snail Sea snail is a common name for slow-moving marine gastropod molluscs, usually with visible external shells, such as whelk or abalone. They share the taxonomic class Gastropoda with slugs, which are distinguished from snails primarily by the ...

, a marine

gastropod The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, from freshwater, and from land. T ...

mollusk in the family Mangeliidae.WoRMS (2009). Cytharopsis butonensis. In: MolluscaBase (2017). Accessed through: World Register of Marine Species a
on 2017-04-26
/ref>

Taxonomy

Shuto (1970) referred the Indonesian ''Mangilia butonensis'' Schepman, 1913 which may indeed be an aberrant ''

Leiocithara ''Leiocithara'' is a genus of sea snails, marine gastropod mollusks in the family Mangeliidae.Bouchet, P. (2011). Leiocithara Hedley, 1922. In: MolluscaBase (2017). Accessed through: World Register of Marine Species at http://www.marinespecies.or ...

'' Hedley, 1922, although its narrow shape could indicate that M.M. Schepman was closer in ascribing it to the genus ''Mangelia''. Kuroda & Oyama (1971) transferred ''Mangilia butonensis'' to ''Cytharopsis''

Description

The length of the shell varies between 12 mm and 20 mm. (Original description) The shell has an elongately fusiform shape, with a high spire and moderately long

siphonal canal The siphonal canal is an anatomical feature of the shells of certain groups of sea snails within the clade Neogastropoda. Some sea marine gastropods have a soft tubular anterior extension of the mantle called a siphon through which water is ...

. It is smooth, shining, pellucid and white. It contains 8 whorl, of which 3½ seem to form a convexly whorled

protoconch A protoconch (meaning first or earliest or original shell) is an embryonic or larval shell which occurs in some classes of molluscs, e.g., the initial chamber of an ammonite or the larval shell of a gastropod. In older texts it is also called ...

. Of these the upper 2 are smooth, the rest with crowded axial ribs. The post-nuclear whorls show more remote ribs, 7 or 8 on penultimate whorl, each rib with a small point near its middle, giving an angular appearance to these whorls, though the interstices are nearly regularly rounded. The upper part of the whorls are very faintly crenulate. The base of the

body whorl The body whorl is part of the morphology of the shell in those gastropod mollusks that possess a coiled shell. The term is also sometimes used in a similar way to describe the shell of a cephalopod mollusk. In gastropods In gastropods, the b ...

shows very faint spiral striae, more conspicuous on the ribs and a few stronger ones on the siphonal canal. The aperture is oblong, narrow, slightly angular above, below with a rather wide siphonal canal. The peristome is sharp, with a shallow sinus above and a strong rib at some distance behind its margin. The columellar margin is slightly concave above, directed to the left below, with a thin layer of enamel. The interior of the aperture is smooth.Schepman, 1913. The prosobranchia of the Siboga expedition. Part IV -V - VI: Toxoglossa
/ref>

Distribution

This marine species occurs off

Sulawesi Sulawesi (), also known as Celebes (), is an island in Indonesia. One of the four Greater Sunda Islands, and the world's eleventh-largest island, it is situated east of Borneo, west of the Maluku Islands, and south of Mindanao and the Sulu Ar ...

, Indonesia; in the

East China Sea The East China Sea is an arm of the Western Pacific Ocean, located directly offshore from East China. It covers an area of roughly . The sea’s northern extension between mainland China and the Korean Peninsula is the Yellow Sea, separated b ...

, Taiwan, the

Andaman Sea The Andaman Sea (historically also known as the Burma Sea) is a marginal sea of the northeastern Indian Ocean bounded by the coastlines of Myanmar and Thailand along the Gulf of Martaban and west side of the Malay Peninsula, and separated from ...

, off Thailand and the Philippines.

References

* Liu J.Y. uiyu(ed.). (2008). Checklist of marine biota of China seas. China Science Press. 1267 pp.

External links

Tucker, J.K. 2004 ''Catalog of recent and fossil turrids (Mollusca: Gastropoda)''. Zootaxa 682: 1–1295.
*
MNHN, Paris: ''Cytharopsis butonensis''
{{DEFAULTSORT:Cytharopsis Butonensis butonensis Gastropods described in 1913 Molluscs of the Pacific Ocean