''Calliotrochus'' is a

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

sea snail Sea snails are slow-moving marine (ocean), marine gastropod Mollusca, molluscs, usually with visible external shells, such as whelk or abalone. They share the Taxonomic classification, taxonomic class Gastropoda with slugs, which are distinguishe ...

s, marine

gastropod Gastropods (), commonly known as slugs and snails, belong to a large Taxonomy (biology), taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, freshwater, and fro ...

mollusk Mollusca is a phylum of protostomic invertebrate animals, whose members are known as molluscs or mollusks (). Around 76,000 extant species of molluscs are recognized, making it the second-largest animal phylum after Arthropoda. The ...

s in the subfamily

Stomatellinae Stomatellinae is a subfamily of small sea snails with a brilliantly nacreous interior of the shell, marine gastropod mollusks in the family Trochidae, the top snails.Gofas, S. (2012). Stomatellinae. Accessed through: World Register of Marine Spe ...

of the

family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...

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.Bouchet, P. (2012). ''Calliotrochus'' P. Fischer, 1879. 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 catalogue and list of names of marine organisms. Content The content of the registry is edited and maintained by scien ...

at http://www.marinespecies.org/aphia.php?p=taxdetails&id=512277 on 2012-11-23

Description

This genus consists of thin, small, shining globose species with a turbinate shape. It has rounded, smooth or spirally striate, convex

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). In nature File:Photograph and axial plane floral diagra ...

s. The

aperture In optics, the aperture of an optical system (including a system consisting of a single lens) is the hole or opening that primarily limits light propagated through the system. More specifically, the entrance pupil as the front side image o ...

is rounded. The outer

lip The lips are a horizontal pair of soft appendages attached to the jaws and are the most visible part of the mouth of many animals, including humans. Mammal lips are soft, movable and serve to facilitate the ingestion of food (e.g. sucklin ...

and

columella Lucius Junius Moderatus Columella (, Arabic: ) was a prominent Roman writer on agriculture in the Roman Empire. His in twelve volumes has been completely preserved and forms an important source on Roman agriculture and ancient Roman cuisin ...

are simple, thin and arcuate. The

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

is narrow.Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia
/ref>

Species

Species within the genus ''Calliotrochus'' include: * '' Calliotrochus marmoreus'' (Pease, 1861)
The following species were brought into synonymy: * ''Calliotrochus excellens'' Iredale, 1937: synonym of '' Calliotrochus marmoreus'' (Pease, 1861) * ''Calliotrochus legrandi'' May, W.L. 1921: synonym of '' Minopa legrandi'' (Petterd, 1879) * ''Calliotrochus normalis'' Iredale, 1937: synonym of '' Calliotrochus marmoreus'' (Pease, 1861) * ''Calliotrochus symbolicus'' Iredale, 1937: synonym of '' Calliotrochus marmoreus'' (Pease, 1861) * ''Calliotrochus tasmanicus'' May, W.L. 1923: synonym of '' Nanula tasmanica'' (Petterd, 1879)

References

* Gatliff, J.H. & Gabriel, C.J., 1922. ''Additions to and alterations in the Catalogue of Victorian Marine Mollusca''. Proc. R. Soc. Vict.n.s., 34(2):128-161. * Herbert, D.G., 1998. ''Revision of the genus Calliotrochus Fischer, 1879 (Gastropoda: Trochoidea)''. Invertebrate Taxonomy, 12:545-565. {{Taxonbar, from=Q5022575 Trochidae Monotypic gastropod genera