|
''Ketyconus'' 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 ''Ketyconus'' 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 ''Ketyconus'' da Motta, 1991 ::Shell characters (living and fossil species) :::The shell is turgid in shape with subangulate shoulders. The protoconch is paucispiral. The whorl tops are not concave, are ornamented with cords, and nodules are absent. The anal notch is shallow, an anterior notch is absent, and a dentiform plait may be present. The periostracum is smooth, and the operculum is moderate in size. ::Radular tooth (not known for fossil species) :::The anterior section of the radular tooth is substantially longer than the posterior section, and the blade is relatively short being less than one-third the length of the anterior section. A basal spur is present, the barb is short. The radular tooth has one or two rows of large serrations flanked by multiple rows of smaller serrations. ::Geographical distribution :::The only species in this genus is endemic to the South African region. ::Feeding habits :::These cone snails are presumed to be vermivorous, meaning that the cones prey on polychaete worms, based upon the radular tooth morphology.〔 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「Ketyconus」の詳細全文を読む スポンサード リンク
|