Turbo crassus

Turbo crassus
Drawing with an apertural view of a shell of Turbo crassus
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Vetigastropoda
Order:	Trochida
Superfamily:	Trochoidea
Family:	Turbinidae
Genus:	Turbo
Species:	T. crassus
Binomial name
Turbo crassus W. Wood, 1828
Synonyms
Turbo (Marmarostoma) crassus W. Wood, 1828

Turbo crassus, common name the crass turban, is a species of sea snail, a marine gastropod mollusk in the family Turbinidae, the turban snails.^[1]

Description

The size of the shell varies between 50 mm and 80 mm. The large, heavy, solid, imperforate shell has an ovate-conic shape. Its color pattern is dirty white, or greenish, maculated with angular, alternating blackish or brown and light patches on the broad flat spiral ribs. The interstices are narrow, superficial, and whitish. The six whorls are, convex, more or less prominently shouldered above. The ribs are obsolete around the axis. The aperture is white within and measures over half the length of shell. It is ovate, angled posteriorly and at position of the carina. Its margin is more or less green tinged, not fluted. The columella is thickened and effuse at its base, callous posteriorly.

The operculum is subcircular, concave internally, with a nucleus one-third the distance across face. Its outer surface is very convex, the center dark-brown, coarsely granulose, lighter toward the outer margin and more minutely granulate. The margin of increment is white.^[2]

Distribution

This marine species occurs in the Western Pacific and Polynesia; off Australia (Queensland).

Notes

Additional information regarding this species:^[1]

• Taxonomic status: Some authors place the name in the subgenus Turbo (Marmarostoma)

References

1. WoRMS (2012). Turbo crassus W. Wood, 1828. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=534211 on 2012-09-01
2. G.W. Tryon (1888), Manual of Conchology X; Academy of Natural Sciences, Philadelphia

• Wood, W. 1828. Index Testaceologicus; or A Catalogue of Shells, British and Foreign, arranged according to the Linnean system. London : Taylor Supplement, 1-59, pls 1-8
• Ladd, H.S. 1966. Chitons and gastropods (Haliotidae through Adeorbidae) from the western Pacific Islands. United States Geological Survey Professional Papers 531: 1-98 16 pls
• Wilson, B. 1993. Australian Marine Shells. Prosobranch Gastropods. Kallaroo, Western Australia : Odyssey Publishing Vol. 1 408 pp.
• Alf A. & Kreipl K. (2003). A Conchological Iconography: The Family Turbinidae, Subfamily Turbininae, Genus Turbo. Conchbooks, Hackenheim Germany.

External links

• Encyclopedia of Life
• USNM Invertebrate Zoology Mollusca Collection
• World Register of Marine Species
• "Turbo (Marmarostoma) crassus". Gastropods.com. Retrieved 16 January 2019.