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''Turbo saxosus'', common name the stony turban, is a species of sea snail, marine gastropod mollusk in the family Turbinidae. * Taxonomic status: Some authors place the name in the subgenus ''Turbo (Callopoma)'' . ==Description== The length of the shell varies between 20 mm and 54 mm. The imperforate shell has an ovate-conic shape. Its color pattern is brown, olive or gray, above radiately marked, below irregularly maculated with snowy white, sometimes dark, unicolored. The conic spire is acute. The suture is canaliculate. The 5-6 whorls are lamellosely densely striate and spirally irregularly lirate. They are carinated, usually more or less nodose at the shoulder, and bear a subsutural series of stout erect tubercles. The rounded aperture measures half the length of the shell. It is white and iridescent within. The arched columella is callous, concave. It has a deep semilunar longitudinal groove and is slightly produced at its base. The operculum is rounded oval, flat and dark chestnut inside, with four or five whorls and a subcentral nucleus. Its outer surface is convex, white, middle portion coarsely granulose, with a deep narrow central pit, bounded by a deep concentric farrow not continuous over the margin of increment, outside of which are three narrow minutely beaded concentric ridges. The margin of increment is granulose. It is an extremely variable species. Frequently several tuberculate lirae encircle the base. And in this strongly nodose variety the incremental striae are usually inconspicuous. In another form the spiral lirae are not noticeably tuberculate. 〔 (G.W. Tryon (1888), Manual of Conchology X; Academy of Natural Sciences, Philadelphia ) 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Turbo saxosus」の詳細全文を読む スポンサード リンク
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