''Tegula cooksoni'' is a

species In biology, a species is the basic unit of Taxonomy (biology), 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 ...

of sea snail, a

marine Marine is an adjective meaning of or pertaining to the sea or ocean. Marine or marines may refer to: Ocean * Maritime (disambiguation) * Marine art * Marine biology * Marine debris * Marine habitats * Marine life * Marine pollution Military * ...

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 es ...

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 ...

Tegulidae Tegulidae is a family of small to large sea snails, marine gastropod mollusks in the superfamily Trochoidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005).Bouchet, P. (2013). Tegulidae Kuroda, Habe & Oyama, 1971. Acce ...

.WoRMS (2012). ''Tegula cooksoni'' (E.A. Smith, 1877). Accessed through:

World Register of Marine Species The World Register of Marine Species (WoRMS) is a taxonomic database that aims to provide an authoritative and comprehensive list of names of marine organisms. Content The content of the registry is edited and maintained by scientific speciali ...

at http://www.marinespecies.org/aphia.php?p=taxdetails&id=575626 on 2012-09-01

Description

The height of the shell attains 4 mm, its diameter 8 mm. The shell is deeply umbilicated. suborbicular and slightly conoidal. Its color is brown, variegated with rosy, painted with white lines articulated with black. The coloration of this species is not very definite. The upper surface is blotched irregularly with pink and brown, and some spiral articulated lines. The base is a trifle paler The 4½

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 flo ...

s are nearly smooth, and slightly convex. They are sculptured with few delicate, fine spiral striae, which are most conspicuous on the base. The body whorl is convex above, and slightly depressed beneath the suture, at the periphery flattened and biangulate. The base of the shell is nearly flat, delicately spirally striate, around the umbilicus encircled with a shallow groove. The

umbilicus Umbilicus may refer to: *The navel or belly button *Umbilicus (mollusc), a feature of gastropod, Nautilus and Ammonite shell anatomy * ''Umbilicus'' (plant), a genus of over ninety species of perennial flowering plants *Umbilicus urbis Romae The ...

is white, deep, surrounded by a whitish callus forming a faint tooth at the base of the columella. It is bordered by a shallow sulcus on the whorl. 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 ...

is suborbicular. 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 ...

is arcuate, joined above to the whorl by a callus, which extends upward some distance on the whorl, and also spreads out within the aperture.Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia
/ref>

Distribution

This species occurs in the Pacific Ocean off the Galapagos Islands and

Cocos Island Cocos Island ( es, Isla del Coco) is an island in the Pacific Ocean administered by Costa Rica, approximately southwest of the Costa Rican mainland. It constitutes the 11th of the 13 districts of Puntarenas Canton of the Province of Puntarena ...

, Costa Rica

References

External links

To USNM Invertebrate Zoology Mollusca Collection

To World Register of Marine Species
{{Taxonbar, from=Q7694776 cooksoni Gastropods described in 1877