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''Cylinder'' is a proposed genus of sea snails, marine gastropod mollusks in the family Conidae, the cone snails and their allies. This genus currently (November 2011) is still treated by some experts as an "alternative representation" of this group of species. When the "alternative representations" are not used, this group of species is instead still placed in the Linnaean genus ''Conus''. ==Distinguishing characteristics== The Tucker & Tenorio 2009 taxonomy distinguishes ''Cylinder'' from ''Conus'' in the following ways:〔Tucker J.K. & Tenorio M.J. (2009), Systematic Classification of Recent and Fossil Conoidean Gastropods, ConchBooks, Hankenheim, Germany, 295 pp.〕 * Genus ''Conus'' ''sensu stricto'' Linnaeus, 1758 :: Shell characters (living and fossil species) :::The basic shell shape is conical to elongated conical, has a deep anal notch on the shoulder, a smooth periostracum and a small operculum. The shoulder of the shell is usually nodulose and the protoconch is usually multispiral. Markings often include the presence of tents except for black or white color variants, with the absence of spiral lines of minute tents and textile bars. ::Radular tooth (not known for fossil species) :::The radula has an elongated anterior section with serrations and a large exposed terminating cusp, a non-obvious waist, blade is either small or absent and has a short barb, and lacks a basal spur. ::Geographical distribution :::These species are found in the Indo-Pacific region. ::Feeding habits :::These species eat other gastropods including cones.〔 * Genus ''Cylinder'' Montfort, 1810 ::Shell characters (living and fossil species) :::The shell is ovate to elongated in shape. The protoconch is multispiral, the spire is conical to convex in shape. The anal notch is deep. The shell is conspicuously ornamented with rows of tents or textile bars. The periostracum is smooth, and the operculum is small. ::Radular tooth (not known for fossil species) :::The anterior section of the radula is substantially more elongated than the posterior section. The waist is not obvious. A basal spur is absent, and the barb is short. The blade and a terminating cusp are present. ::Geographical distribution :::All but one species in this genus are found in the Indo-Pacific region; ''Cylinder dalli'' is found in the Eastern Pacific region. ::Feeding habits :::These species are molluscivorous (meaning that they prey on other mollusks).〔 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「Cylinder (gastropod)」の詳細全文を読む スポンサード リンク
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