''Mangelia decaryi '' 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.Dautzenberg, Philippe. Mollusques testacés marins de Madagascar. Supplément, par Ph. Dautzenberg. Journal de Conchyliologie, Vol. LXXVI, 1932,

Description

The length of the shell attains 13 mm, its diameter 4 mm. This rather solid shell had a high spire with 8 convex

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, separated by a distinct suture. The 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 ...

are smooth. The others show axial plicae that are a little arcuate and become sigmoid on 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 ...

. The aperture is rather wide and lacks a

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 ...

at its base. The columella shows a callosity that becomes rather thick at the top. The outer lip is incrassate, bends off inwards and ends at the top into a large and deep sinus. The color of the shell is white, banded in the upper whorls by a series of brown spots between the axial plicae.

Distribution

This marine species occurs off Madagascar

References

External links

Tucker, J.K. 2004 ''Catalog of recent and fossil turrids (Mollusca: Gastropoda)''. Zootaxa 682:1-1295
{{Taxonbar, from=Q39090886 decaryi Gastropods described in 1932