''Calliotropis multisquamosa'' 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 ...

Eucyclidae Eucyclidae is a family of gastropods in the superfamily Seguenzioidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). This family has no subfamilies. Genera Genera within the family Eucyclidae include: * '' Amberley ...

Description

The shell grows to a height of 5½ mm. The shell has a conical shape with rounded periphery and a slightly convex base, umbilicated, white, scarcely with a yellowish tinge. The 6½

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 are convex. The nucleus is smooth, the subsequent whorl has concentric ribs. On the lower whorls 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 ...

consists of radiating ribs, with a row of compressed tubercles, at some distance from the channelled suture, which disappear on the upper whorls. These ribs are crossed by 2 spiral cords, with short, hollow scales, about 25 in number on the

body whorl The body whorl is part of the morphology of the shell in those gastropod mollusks that possess a coiled shell. The term is also sometimes used in a similar way to describe the shell of a cephalopod mollusk. In gastropods In gastropods, the b ...

. On the last, rounded whorl, the base is bordered by a third row of smaller scales. The base is slightly convex, with 3 rather large, spiral cords, of which that bordering the umbilicus is the broadest. They are crossed by concentric ribs, running over the whole base and making the cords crenulated. The funnel-shaped umbilicus is pervious. Its wall shows concentric, riblike striae, and a spiral, beaded cord near the base. Its larger diameter occupies ⅓ of that of the shell. 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 subcircular, straighter on the side of the slightly concave columella, which forms a conspicuous angle with the basal margin. The parietal wall has a thin layer of enamel, forming a small projection, covering part of the umbilicus. The interior of the nacreous aperture is smooth, and has a flattened rib near the outer and basal margin. It differs from the allied species, by the rows of short scales, and from all the preceding species, by the rounded periphery of the body whorl.Schepman M.M. (1909), The prosobranchia of the Siboga Expedition
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Distribution

This species occurs in the

Sulu Sea The Sulu Sea ( fil, Dagat Sulu; Tausug: ''Dagat sin Sūg''; Chavacano: ''Mar de Sulu''; Cebuano: ''Dagat sa Sulu''; Hiligaynon: ''Dagat sang Sulu''; Karay-a: ''Dagat kang Sulu''; Cuyonon: ''Dagat i'ang Sulu''; ms, Laut Sulu) is a body o ...

, the Philippines; also off

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References

External links

Vilvens C. (2007) New records and new species of Calliotropis from Indo-Pacific. Novapex 8 (Hors Série 5): 1-72
{{Taxonbar, from=Q5022651 multisquamosa Gastropods described in 1908