''Cratidentium tiberianum'' is a

species In biology, a species is the basic unit of Taxonomy (biology), 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 ...

of sea snail, 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

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 es ...

in the

family Family (from la, familia) is a group of people related either by consanguinity (by recognized birth) or affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its members and of society. Idea ...

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.

Description

The size of the shell varies between 4 mm and 9 mm. The imperforate, rather thin shell has a conical shape. It is olivaceous with nacreous reflections. It is ornamented with flexuous longitudinal grayish streaks. 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 ...

is moderately elevated. The suture is impressed. The 5½ to 6

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 flo ...

s are subplanate with the body whorl obtusely angulated. The base of the shell is obsoletely striated and covered with spots of grayish-white. 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 ...

is oblique, quadrate, inside white and nacreous. 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 ...

is somewhat expanded. The outer

lip The lips are the visible body part at the mouth of many animals, including humans. Lips are soft, movable, and serve as the opening for food intake and in the articulation of sound and speech. Human lips are a tactile sensory organ, and can be ...

is simple and acute.Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia
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Distribution

This marine species is

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found els ...

to Australia and occurs off

New South Wales ) , nickname = , image_map = New South Wales in Australia.svg , map_caption = Location of New South Wales in AustraliaCoordinates: , subdivision_type = Country , subdivision_name = Australia , established_title = Before federation , es ...

Victoria Victoria most commonly refers to: * Victoria (Australia), a state of the Commonwealth of Australia * Victoria, British Columbia, provincial capital of British Columbia, Canada * Victoria (mythology), Roman goddess of Victory * Victoria, Seychelle ...

South Australia South Australia (commonly abbreviated as SA) is a state in the southern central part of Australia. It covers some of the most arid parts of the country. With a total land area of , it is the fourth-largest of Australia's states and territories ...

and

Tasmania ) , nickname = , image_map = Tasmania in Australia.svg , map_caption = Location of Tasmania in AustraliaCoordinates: , subdivision_type = Country , subdi ...

References

* Adams, A. & Angas, G.F. 1864. ''Descriptions of new species of shells, chiefly from Australia in the collection of Mr Angas''. Proceedings of the Zoological Society of London 1864: 35-40 * Angas, G.F. 1865. ''On the marine molluscan fauna of the Province of South Australia, with a list of all the species known up to the present time, together with remarks on their habitats and distribution'', etc. Proceedings of the Zoological Society of London 1865: 155-"180" * Angas, G.F. 1867. ''A list of species of marine Mollusca found in Port Jackson harbour, New South Wales and on the adjacent coasts, with notes on their habits etc''. Proceedings of the Zoological Society of London 1867: 185–233, 912-935 * Tenison-Woods, J.E. 1878. ''On some new marine Mollusca''. Transactions and Proceedings of the Royal Society of Victoria 14: 55-65 * Fischer, P. 1879. ''Genres Calcar, Trochus, Xenophora, Tectarius et Risella. 337-463'', 120 pls in Keiner, L.C. (ed.). Spécies general et iconographie des coquilles vivantes. Paris : J.B. Baillière Vol. 3 * Tenison-Woods, J.E. 1879. ''Census; with brief descriptions of the marine shells of Tasmania and the adjacent islands''. Proceedings of the Royal Society of Tasmania 1877: 26-57 * Whitelegge, T. 1889. ''List of the Marine and Fresh-Water Invertebrate Fauna of Port Jackson and Neighbourhood.'' Proceedings of the Royal Society of New South Wales 23: 1-161 * Tate, R. 1897. ''Critical remarks on some Australian Mollusca.'' Transactions of the Royal Society of South Australia 1897: 40-49 * Tate, R. & May, W.L. 1901. ''A revised census of the marine Mollusca of Tasmania.'' Proceedings of the Linnean Society of New South Wales 26(3): 344-471 * Pritchard, G.B. & Gatliff, J.H. 1902. ''Catalogue of the marine shells of Victoria. Part V''. Proceedings of the Royal Society of Victoria 14(2): 85-138 * May, W.L 1903. ''On Tenison-Woods types in the Tasmanian Museum, Hobart''. Proceedings of the Royal Society of Tasmania 1902: 106-114 * Hedley, C. 1918. ''A checklist of the marine fauna of New South Wales. Part 1''. Journal and Proceedings of the Royal Society of New South Wales 51: M1-M120 * May, W.L. 1921. ''A Checklist of the Mollusca of Tasmania. Hobart, Tasmania'' : Government Printer 114 pp. * May, W.L. 1923. ''An Illustrated Index of Tasmanian Shells''. Hobart : Government Printer 100 pp. * Iredale, T. & McMichael, D.F. 1962. ''A reference list of the marine Mollusca of New South Wales''. Memoirs of the Australian Museum 11: 1-109 * Macpherson, J.H. & Gabriel, C.J. 1962. ''Marine Molluscs of Victoria''. Melbourne : Melbourne University Press & National Museum of Victoria 475 pp * Macpherson, J.H. 1966. ''Port Philip Survey 1957-1963''. Memoirs of the National Museum of Victoria, Melbourne 27: 201-288 * Phillips, D.A.B., Handreck, C., Bock, P.E., Burn, R., Smith, B.J. & Staples, D.A. (eds) 1984. ''Coastal Invertebrates of Victoria: an atlas of selected species.'' Melbourne : Marine Research Group of Victoria & Museum of Victoria 168 pp. * Wilson, B. 1993. ''Australian Marine Shells. Prosobranch Gastropods''. Kallaroo, Western Australia : Odyssey Publishing Vol. 1 408 pp.

External links

World Register of Marine Species
* {{Taxonbar, from=Q13453085 tiberianum Gastropods of Australia Gastropods described in 1863