''Mangelia hyemalis'' 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.Rosenberg, G. (2010). Mangelia hyemalis (Mabille & Rochebrune, 1889). In: MolluscaBase (2017). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=533017 on 2017-09-03

Description

The length of the shell attains 30 mm. The shell has a fusiform shape. It is slightly translucent but still solid. The spire has an elongated conical shape. 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 ...

is papillar, white and shining. The shell contains 9

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. They are slightly impressed towards the suture. They are at first smooth but then become obliquely costulate and rugose. The narrow aperture has an elongated oval shape with on top a large and deep sinus. 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 very short and wide open. The columella is slightly arcuate and is thickened at its base. Rochebrune A.-T. de & Mabille J.. (1889). Mollusques. in: Mission Scientifique du Cap Horn 1882–1883. Tome 6 (Zoologie 2, part 8). Paris, Gauthiers-Villars. H.1-H.129, pls. 1–8
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Distribution

This marine species occurs off Tierra del Fuego.

References

External links

*
Tucker, J.K. 2004 ''Catalog of recent and fossil turrids (Mollusca: Gastropoda)''. Zootaxa 682:1–1295.

MNHN, Paris: syntype
{{DEFAULTSORT:Mangelia Hyemalis hyemalis Gastropods described in 1888