''Clanculus spadiceus'' is a species of

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 in the family Trochidae, the top snails.

Description

The height of the shell attains 10 mm, its diameter 14 mm. The thick, shining umbilicate shell has a conoid shape. The 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 are convex. The first whorl has a vivid rose color, the following chestnut-brown,. They are subcanaliculate at the suture, in the middle subangulate and minutely spirally cingulate. The ridges number about 9 on the penultimate whorl. 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 ...

is carinated, slightly convex beneath and paler, white and brown maculate, concentrically marked with about 9 delicate lirae, the interstices radiately striate. The aperture is subtrapezoidal and plicate within. The lip is double. The basal margin is denticulate. The oblique columella is granulose without, above contorted, truncated below. The umbilical area is white, with an interior spiral ridge and is crenulated at its margin. The columellar callus is obsolete.H. Pilsbry, Manual of Conchology XI, Academy of Natural Sciences, Philadelphia
(described as ''Trochus spadiceus'')

Gallery

File:Clanculus simoni 002.jpg File:Clanculus simoni 003.jpg

Distribution

This marine species occurs in the Atlantic Ocean off

São Tomé and Principe SAO or Sao may refer to: Places * Sao civilisation, in Middle Africa from 6th century BC to 16th century AD * Sao, a town in Boussé Department, Burkina Faso * Saco Transportation Center (station code SAO), a train station in Saco, Maine, U.S. ...

References

{{DEFAULTSORT:Clanculus Spadiceus spadiceus Molluscs of the Atlantic Ocean Invertebrates of São Tomé and Príncipe Taxa named by Rodolfo Amando Philippi Gastropods described in 1848