''Mangelia callicredemna'' 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 ...

mollusc Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is esti ...

in the family Mangeliidae.Melvill J.C., 1917. A revision of the Turridae (Pleurotomidae) occurring in the Persian Gulf, Gulf of Oman and north Arabian Sea as evidenced mostly through the results of dredgings carried out by Mr F. W. Townsend, 1893~1914. Proc. Malac. Soc. Lond. 12: 140-201, pls. 8-10

Description

The length of the shell attains 4.5 mm, its diameter 2 mm. The white, minute shell has an ovate-fusiform shape. It contains 8

whorl A whorl ( or ) is an individual circle, oval, volution or equivalent in a whorled pattern, which consists of a spiral or multiple concentric objects (including circles, ovals and arcs). Whorls in nature File:Photograph and axial plane floral ...

s, of which two vitreous whorls in the

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 ...

. The oblique aperture is ovate. The outer lip is thin. The columellar margin is sinuate. The

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 ...

is wide but little produced. Akin to ''

Ceritoturris pupiformis ''Ceritoturris pupiformis'' is a species of sea snail, a marine gastropod mollusk in the family Horaiclavidae.Bouchet, P. (2015). Ceritoturris pupiformis. In: MolluscaBase (2015). Accessed through: World Register of Marine Species at http://www. ...

'' E.A. Smith, 1884., this small novelty occurred sparsely with it. It differs in several particulars, notably in form, being far less attenuate and cylindrical, the median whorls are all strongly uniangulate, and the body whiorl is not so lengthened, proportionately, as is that of ''C. pupiformis''.

Distribution

This marine species occurs in the

Gulf of Oman The Gulf of Oman or Sea of Oman ( ar, خليج عمان ''khalīj ʿumān''; fa, دریای عمان ''daryâ-ye omân''), also known as Gulf of Makran or Sea of Makran ( ar, خلیج مکران ''khalīj makrān''; fa, دریای مکرا� ...

References

External links

Tucker, J.K. 2004 ''Catalog of recent and fossil turrids (Mollusca: Gastropoda)''. Zootaxa 682:1-1295.
* callicredemna Gastropods described in 1917 {{Mangeliidae-stub