''Coelotrochus'' is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...

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 ...

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 ...

s 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 ...

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. (2010). Coelotrochus P. Fischer, 1879. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=512304 on 2012-06-20

Description

The false umbilicus is very deep and narrow, penetrating deeper than 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 wo ...

, which is inserted upon its edge, not in the centre of the axis. Suter H. (1913-1915), Manual of New Zealand Mollusca; Wellington, N. Z. :J. Mackay, govt. printer,1913-1915
/ref>

Distribution

This marine genus is endemic to

New Zealand New Zealand ( mi, Aotearoa ) is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island () and the South Island ()—and over 700 smaller islands. It is the sixth-largest island count ...

Species

Species within the genus ''Coelotrochus'' include: * † '' Coelotrochus avarus'' (Suter, 1917) * † '' Coelotrochus bibaphus'' (Bartrum & Powell, 1928) * † '' Coelotrochus browni'' (C. A. Fleming, 1943) * '' Coelotrochus carinatus'' (B. A. Marshall, 1998) * '' Coelotrochus carmesinus'' (Webster, 1908) * '' Coelotrochus chathamensis'' (Hutton, 1873) * '' Coelotrochus davegibbsi'' (B. A. Marshall, 1998) * † '' Coelotrochus fossilis'' (Finlay, 1926) * † '' Coelotrochus gracilis'' (Laws, 1936) * '' Coelotrochus oppressus'' (B. A. Marshall, 1998) * '' Coelotrochus polychromus'' (B. A. Marshall, 1998) * '' Coelotrochus rex'' (B. A. Marshall, 1998) * ''

Coelotrochus tiaratus ''Coelotrochus tiaratus'', whose common names include tiara top shell, brown top shell, mititi, and mitimiti is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.Rosenberg, G. (2012). ''Coelotrochus tiarat ...

'' (Quoy & Gaimard, 1834) * '' Coelotrochus viridis'' (Gmelin, 1791)

References

Nomenclator Zoologicus info

Image of the holotype of the species, N.Z. government site
* Williams S.T., Donald K.M., Spencer H.G. & Nakano T. (2010) ''Molecular systematics of the marine gastropod families Trochidae and Calliostomatidae (Mollusca: Superfamily Trochoidea).'' Molecular Phylogenetics and Evolution 54:783-809.

External links

Iredale T. (1915). A commentary on Suter's Manual of the New Zealand Mollusca. Transactions and Proceedings of the New Zealand Institute. 47: 417-497
Trochidae Gastropods of New Zealand Gastropod genera {{Trochidae-stub