''Lodderia coatsiana'' is a

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

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 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 Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its ...

Skeneidae The Skeneidae are a speciose family of minute to small marine gastropod molluscs in the superfamily Trochoidea.Bouchet, P.; Gofas, S. (2013). Skeneidae. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php ...

.Rosenberg, G. (2013). Lodderia coatsiana (Melvill & Standen, 1912). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=532990 on 1 September 2013

Description

The height of the shell attains 2.25 mm. This is a small, solid, white shell with a deep umbilicus, elegantly sculptured. It contains 4

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, with two apical sleek, white whorls. The two others are aequicostate with smooth, thickened, subflexuous ribs. The penultimate whorl is very flat. The last whorl has four spiral keels, with a blunt keel below the sutures, two at the periphery. The

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 opt ...

is round.Melvill & Standen (1912), ''The Marine Mollusca of the Scottish National Antarctic Expedition Part II. Being a supplementary catalogue''. Transactions of the Royal Society of Edinburgh. v.48 (1912)
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Distribution

This marine species occurs in the Magellanic Strait off Argentina at a depth of about 100 m.

References

* Engl W. (2012) ''Shells of Antarctica''. Hackenheim: Conchbooks. 402 pp. coatsiana Gastropods described in 1912 {{Liotiidae-stub