''Trochus intextus'' 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 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 ...

Trochidae The Trochidae, common name top-snails or top-shells, are a family of various sized sea snails, marine gastropod molluscs in the subclass Vetigastropoda. This family is commonly known as the top-snails because in many species the shell resembles ...

, the top snails.Rosenberg, G. (2014). Trochus intextus Kiener, 1850. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=742894 on 2014-06-16

Description

The size of the shell varies between 20 mm and 30 mm. The thick, solid shell has a rather straightly conical shape and is falsely umbilicate. The outlines of the nearly rectilinear

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 are ...

are nearly straight with an acute

apex The apex is the highest point of something. The word may also refer to: Arts and media Fictional entities * Apex (comics), a teenaged super villainess in the Marvel Universe * Ape-X, a super-intelligent ape in the Squadron Supreme universe *Apex, ...

. The shell contains about eight

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. The body whorl is obtusely angulated at the periphery. The sutures are scarcely impressed. The color of the upper surface grayish or corneous white, broadly longitudinally striped with red or purplish, the red sometimes covering the whole surface, sometimes reduced to small maculations or narrow lines. The base of the shell contains narrow zigzag radiating red stripes. The

sculpture Sculpture is the branch of the visual arts that operates in three dimensions. Sculpture is the three-dimensional art work which is physically presented in the dimensions of height, width and depth. It is one of the plastic arts. Durable sc ...

of the upper surface consists of spiral series of very regular, deeply, separated rounded granules or beads, five or six rows on each whorl. On the periphery and base the granules are smaller. On the base of the shell the rows are more separated, and sometimes have minute intercalated beaded lirae. In the interstices; there are 12 to 15 rows of beads on the entire body 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 small, strongly lirate inside 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 ...

. The dentate basal margin is thick. The parietal wall is callous, strongly lirate, deep crimson colored. 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 oblique, irregularly 3 or 4 dentate. The umbilical tract contains a heavy white callus inside and is obsoletely spirally bi- or triplicate.H. Pilsbry, Manual of Conchology XI, Academy of Natural Sciences, Philadelphia
(described as ''Trochus sandwichensis'')

Distribution

This marine species occurs in the Western Pacific Ocean and off

Hawaii Hawaii ( ; haw, Hawaii or ) is a state in the Western United States, located in the Pacific Ocean about from the U.S. mainland. It is the only U.S. state outside North America, the only state that is an archipelago, and the only ...

References

* Kiener, Spec. gen. Trochus, t. 87, f. 2., 1850

External links

*
Souleyet, L. F. A. (1852). Tome Deuxième. Mollusques. In: Eydoux, F.; Souleyet, L. F. A. (1841-1852). Voyage autour du monde exécuté pendant les années 1836 et 1837 sur la corvette La Bonite. Zoologie. 664 pp., 101 pls

Reeve, L. A. (1861-1862). Monograph of the genus Trochus. In: Conchologia Iconica, or, illustrations of the shells of molluscous animals, vol. 13, pl. 1-47 and unpaginated text. L. Reeve & Co., London.

Kay, E.A. (1979) ''Hawaiian marine shells. Reef and shore fauna of Hawaii. Section 4: Mollusca''. Bernice P. Bishop Museum Special Publications, 64, xviii + 1–653. page(s): 52
{{Taxonbar, from=Q3734688 intextus Gastropods described in 1850