''Obesotoma laevigata'' is a species of sea snail, a marine gastropod

mollusk 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 e ...

in the

family Family (from la, familia) is a group of people related either by consanguinity (by recognized birth) or affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its members and of society. Idea ...

Mangeliidae Mangeliidae is a monophyletic family of small to medium-sized, predatory sea snails, marine gastropod mollusks in the superfamily Conoidea. Bouchet, P. (2011). Mangeliidae P. Fischer, 1883. In: MolluscaBase (2016). Accessed through: World Re ...

Description

The length of the shell varies between 6 mm and 20 mm. (Original description) The short, stout shell consists of four or five robust whorls. These are smooth, or with excessively fine revolving lines. The

spire A spire is a tall, slender, pointed structure on top of a roof of a building or tower, especially at the summit of church steeples. A spire may have a square, circular, or polygonal plan, with a roughly conical or pyramidal shape. Spires a ...

is short, usually one third or less of the total length, but varying somewhat. The suture is distinct but not channelled. The whorls are not turreted. The

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is rather obtuse. The protoconch is minute, whitish, smooth and consists of 1½ whorl . The wide

aperture In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture and focal length of an optical system determine the cone angle of a bundle of rays that come to a focus in the image plane. An ...

is about two-thirds as long as the shell. The outer

lip The lips are the visible body part at the mouth of many animals, including humans. Lips are soft, movable, and serve as the opening for food intake and in the articulation of sound and speech. Human lips are a tactile sensory organ, and can be ...

is effuse. The sutural sinus is more or less marked. The wide siphonal canal is short and straight. The exterior is sometimes marked with rather rugged lines of growth, or is quite smooth, but not polished. The color of the shell is livid purple, with a superficial wash of white, a solid white line below the suture. The anterior extremity of the

columella Lucius Junius Moderatus Columella (; Arabic: , 4 – ) was a prominent writer on agriculture in the Roman Empire. His ' in twelve volumes has been completely preserved and forms an important source on Roman agriculture, together with the wo ...

is white. The

callus A callus is an area of thickened and sometimes hardened skin that forms as a response to repeated friction, pressure, or other irritation. Since repeated contact is required, calluses are most often found on the feet and hands, but they may o ...

is evident but not conspicuous. This very peculiar little shell is of a solid and rugged aspect, even living specimens looking as if beach-worn and dead. It varies in the roundness of the whorls and the elevation of the spire. Living specimens sometimes present no revolving lines, while others show excessively fine ones.W.H. Dall, Descriptions of sixty new forms of mollusks from the West Coast of North America and the North Pacific Ocean, with notes on others already described; American Journal of Concholohy vol. 7, 1871
(described as ''Bela laevigata'')

Distribution

This marine species occurs off

Greenland Greenland ( kl, Kalaallit Nunaat, ; da, Grønland, ) is an island country in North America that is part of the Kingdom of Denmark. It is located between the Arctic and Atlantic oceans, east of the Canadian Arctic Archipelago. Greenland i ...

Iceland Iceland ( is, Ísland; ) is a Nordic island country in the North Atlantic Ocean and in the Arctic Ocean. Iceland is the most sparsely populated country in Europe. Iceland's capital and largest city is Reykjavík, which (along with its s ...

and in the Western

Mediterranean Sea The Mediterranean Sea is a sea connected to the Atlantic Ocean, surrounded by the Mediterranean Basin and almost completely enclosed by land: on the north by Western and Southern Europe and Anatolia, on the south by North Africa, and on the ...

References

* Middendorff T. A. von, 1849 : ''Beiträge zur einer Malacozoologica Rossica, II. Aufzählung und Beschreibung der zur Meeresfauna Russlands gehörigen Einschaler'' ; Mémoires de l'Académie Impériale des Sciences de St-Petersbourg (6) 8 (Sciences naturelles, 6): 329–610 * Bogdanov I.P., 1990 : ''Mollusca, Vol.5, No.3: The mollusk subfamily Oenopotinae (Gastropoda, Pectinibranchia, Turridae) of the USSR seas'' ; Fauna of the USSR New Series, No. 142. 223 p n Russian

External links

Tucker, J.K. 2004 ''Catalog of recent and fossil turrids (Mollusca: Gastropoda)''. Zootaxa 682:1–1295
{{DEFAULTSORT:Obesotoma Laevigata laevigata Gastropods described in 1871