''Mangelia perattenuata'' 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. It was originally published by W.H. Dall as ''Magilia perattenuata'' ic

Description

The length of the shell attains 9.5 mm, its diameter 2.5 mm. (Original description) The small, whitish shell is very slender..It contains one smooth turgid

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 ...

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 ...

, and six smooth normal subsequent whorls. The whorls are but slightly convex. The suture is very distinct, its posterior margin slightly overhanging or dominant. The aperture is narrow, short and simple. The outer lip is slightly concavely waved between the periphery and the suture. 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 short, a little recurved and relatively rather wide.Dall, W.H. (1905) Some new species of mollusks from California; The Nautilus, Vol. 18 (1904–1905)
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Distribution

This marine species was found off Monterey Bay, California, USA.

References

External links

Tucker, J.K. 2004 ''Catalog of recent and fossil turrids (Mollusca: Gastropoda)''. Zootaxa 682:1–1295
{{DEFAULTSORT:Mangelia Perattenuata perattenuata Gastropods described in 1905