''Liotina cycloma'' 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 ...

of small

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 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 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 ...

Liotiidae Liotiidae is a family of small sea snails, marine gastropod mollusks in the clade Vetigastropoda (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005).Gofas, S. (2013). Liotiidae Gray, 1850. Accessed through: World Register of ...

.Rosenberg, G. (2013). ''Liotina cycloma'' Tomlin, 1918. Retrieved 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 specialist ...

at http://www.marinespecies.org/aphia.php?p=taxdetails&id=737881 on 2013-08-29

Description

(Original description by J.R. le B. Tomlin) The height of the shell attains 4 mm, its diameter 7.5 mm. The solid, white shell has a subdiscoidal shape. It is slightly convex above. The umbilicus is narrow, but open to the

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 5½

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 that increase rapidly in size, with a smooth protoconch of 1½ whorls. The rest of the shell is sculptured with very fine, closely packed axial lamellae. There are six spiral cords— one immediately below the suture, ornamented with a series of numerous sharp-pointed cogs, one on the shoulder of the whorl bearing blunt tubercles, which more or less correspond to the cogs above, two very strong ones on the periphery, one tubercled cord below the periphery, and one cogged cord at the margin of the umbilicus. The peripheral cords are connected at regular intervals of about half-a-millimetre by solid, strongly-raised cross pieces, which are more or less M-shaped if the shell be viewed edgewise and are rather suggestive of the endless chain of buckets on a steam-dredger. The supra-peripheral cord gradually disappears in ascending 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 are ...

. 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 circular, guarded by a strong outstanding varix, on which the spiral cords appear as simple or occasionally bifid ridges.Journal of conchology. v. 15-16 (1916-1922), p. 305
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Distribution

This marine species occurs off the

Philippines The Philippines (; fil, Pilipinas, links=no), officially the Republic of the Philippines ( fil, Republika ng Pilipinas, links=no), * bik, Republika kan Filipinas * ceb, Republika sa Pilipinas * cbk, República de Filipinas * hil, Republ ...

References

External links

To World Register of Marine Species
* {{Taxonbar, from=Q16984648 cycloma Gastropods described in 1918