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''Turbonilla'' is a large genus of ectoparasitic sea snails, marine gastropod mollusks in the family Pyramidellidae, the pyrams and their allies.〔Bouchet, P.; Gofas, S. (2011). ''Turbonilla'' Risso, 1826. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=138421 on 2011-11-10〕〔Gofas, S.; Le Renard, J.; Bouchet, P. (2001). Mollusca, in: Costello, M.J. et al. (Ed.) (2001). European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels, 50: pp. 180-213〕〔Spencer, H.; Marshall. B. (2009). All Mollusca except Opisthobranchia. In: Gordon, D. (Ed.) (2009). New Zealand Inventory of Biodiversity. Volume One: Kingdom Animalia. 584 pp〕 ==General description== The generally slender, bluish-white to milk-white, semitranslucent shell is more or less elongated and has a cylindro-conic shape. The apex is sinistral. The reversed, flattened or projecting protoconch consists of 1½ to 3 whorls that are oblique or tilted from transverse to the axis. The teleoconch contains many planulate or more or less convex whorls. These are sometimes shouldered and are generally ornamented with less prominent longitudinal ribs ( = costulate). The intercostal spaces are smooth or crossed bv more or less distinct, incised, sometimes raised, spiral lines. The spiral ines often also appear on the base of the shell, which varies from short, little rounded (the body whorl is subangulated at the periphery), to elongate and well-rounded. The shape of the aperture varies from subquadrate with a straight columellar lip, to an elongate-ovate shape, well-rounded and produced below, with a curved columellar lip. The peritreme is generally discontinuous, rarely continuous. The outer lip is always thin and entire. The inner lip is more or less thickened and reflected, often with a plication or fold that is not always visible externally. The columella is vertical, not plicate. The columellar fold is single, varying in strength. The horny operculum is subspiral. The shell is usually smaller than in ''Pyramidella'' and larger than in ''Odostomia''. The animal has wide tentacles, an elongated, flattened mentum, usually bilobed in front. The foot is large and anteriorly auriculated.〔(Dall & Bartsch, A Monograph of West American Pyramidellid Mollusks, United States National Museum Bulletin 68, p. 19: 1909 )〕〔(G.W. Tryon, Manual of Conchology vol. VIII p. 317 )〕〔( K.J. Bush (1899), Descriptions of New Species of Turbonilla of the Western Atlantic Fauna, with Notes on Those Previously Known; Proceedings of the Academy of Natural Sciences of Philadelphia, Vol. 51, No. 1 (Jan. - Mar., 1899), pp. 145-177 )〕 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「Turbonilla」の詳細全文を読む スポンサード リンク
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