The shells of species in this genus are more or less highly conspiral, thick, about 20–200 mm, first whorls bicarinate, last whorl large often with strong spiral sculpture, knobs or spines, base convex, with or without umbilicus. Species in this genus have a round aperture and a solid, dome-shaped calcareousoperculum. This circular operculum commences as a multispiral disc, like that of a Trochus, upon the outer side of which is deposited a thin calcareous layer by a lobe of the foot which projects partly over it. This arrangement produces an operculum which exhibits all the whorls beneath, but which is only feebly, or not obviously spiral above, from the more or less general distribution of the calcareous matter.
The radula is broad and generally rather short. The median, lateral and marginal teeth are always present, and the formula is invariably ∞.5.1.5.∞. The central teeth contain no cusps. The median tooth consists of a narrow oblong quadrate basal plate, frequently with accessory plates of various forms, to the lower end of which is attached the oval body of the tooth,—a simple plate without cusp, bearing supporting wings at the sides. Frequently the central teeth are asymmetrical in this group. The laterals bear supporting wings at their outer angles, and are various in form, with or without cusps. The inner marginals are very large, with large cusps.[3]
The first Turbo species were found in the Upper Cretaceous, approximately 100 million years ago.
Taxonomy
According to Alf et al.[4] the genus Turbo is divided in 16 Recent subgenera. The number of presently known living species in Turbo is 66, plus five subspecies.
Turbo canalis Montagu, 1803: synonym of Lacuna vincta (Montagu, 1803)
Turbo cancellatus da Costa, 1778: synonym of Alvania cancellata (da Costa, 1778)
Turbo carduus P. Fischer, 1873: synonym of Turbo argyrostomus argyrostomus f. carduus P. Fischer, 1873 accepted as Turbo argyrostomus argyrostomus Linnaeus, 1758 (original rank)
Turbo carinatus Woodward, 1833: synonym of Littorina littorea (Linnaeus, 1758)
Turbo carinatus da Costa, 1778: synonym of Alvania carinata (da Costa, 1778)
When the Caribbean hermit crab, Coenobita clypeatus, or "purple pincher" as it is known in the pet trade is kept as a house pet, Turbo shells are a favorite choice of shells for the crab.
Turbo cornutus, common name the "horned turban", is an expensive food item in Korea, and Japan, where they are known as sazae.[citation needed]
The attractively colored operculum of at least two different Turbo species has been used for various decorative purposes, including in jewelry and buttons. These opercula are sometimes known as "cat's eyes".
^ abAlf A., Kreipl K. & Poppe G. T. (2003) The Family Turbinidae, Subfamily Turbininae, Genus Turbo. In: Poppe G. T. & Groh K. (eds.): A Conchological Iconography: 68 pp., 95 colour plates, ConchBooks, Hackenheim, ISBN3-925919-27-9.
Alf A., Kreipl K. & Poppe G. T. (2003) The Family Turbinidae, Subfamily Turbininae, Genus Turbo. In: Poppe G. T. & Groh K. (eds.): A Conchological Iconography: 68 pp., 95 colour plates, ConchBooks, Hackenheim, ISBN3-925919-27-9.
Williams, S.T. (2007). Origins and diversification of Indo-West Pacific marine fauna: evolutionary history and biogeography of turban shells (Gastropoda, Turbinidae). Biological Journal of the Linnean Society, 2007, 92, 573–592.
Williams S. (2008) The calcareous operculum as a character for defining subgenera in the marine gastropod genus Turbo. Vita Malacologica 7: 1-13. [16 December 2008]
Wikimedia Commons has media related to Turbo (genus).
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