|Two views of a shell of Turbo marmoratus|
Turbo marmoratus, known as the green turban, the marbled turban or great green turban, is a large species of marine gastropod with a thick calcareous operculum in the family Turbinidae, the turban snails. 
The shells of these large sea snails have a very thick layer of nacre; this species has been commercially fished as a source of mother of pearl.
These large snails live in tropical reefs in the Indian Ocean (off Tanzania, Madagascar, Aldabra and the Mascarene Basin) and tropical western Pacific oceans; also off Queensland, Australia. They are nocturnal and feed on algae.
The distinctive shell grows to a length of 18 cm. It bears blunt tubercles, especially strong on the shoulders. Its colour is greyish-green. Its large, circular aperture has a golden, pearly shine.
- WoRMS (2012). Turbo marmoratus Linnaeus, 1758. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=216369 on 2012-10-01
- Oostingh, C.H., 1925. Report on a collection of recent shells from Obi and Halmahera, Molluccas. Mededeelingen van de Landbouwhoogeschool Wageningen, 29(1):1-362.
- Allan, J., 1950. Australian Shells: with related animals living in the sea, in freshwater and on the land. Georgian House, Melbourne. xix 470 pp..
- Drivas, J. & M. Jay (1988). Coquillages de La Réunion et de l'île Maurice
- Wilson, B., 1993. Australian Marine Shells. Prosobranch Gastropods. Odyssey Publishing, Kallaroo, WA
- Alf A. & Kreipl K. (2003). A Conchological Iconography: The Family Turbinidae, Subfamily Turbininae, Genus Turbo. Conchbooks, Hackenheim Germany.
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