|
''Lividoconus'' 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 ''Lividoconus'' 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 ''Lividoconus'' Wils, 1970 ::Shell characters (living and fossil species) :::The shell is obconic in shape. The protoconch is multispiral. The shell is ornamented with nodules which either persist or die out in the outer whorls. The anal notch is shallow. The shell has a distinct interior color layer and well developed constrictions inside the aperture. The anterior end of the shell is blue-black, blue or brown in color. The periostracum is tufted, and the operculum is small to moderate in size. ::Radular tooth (not known for fossil species) :::The radular tooth is elongated, and the anterior section of the radular tooth is equal to slightly longer than the length of posterior section. A basal spur is present, and the barb and blade are short. A partially exposed terminating cusp is present. ::Geographical distribution :::The majority of the species in this genus occur in the Indo-Pacific region, and one species occurs in the Eastern-Pacific region.. ::Feeding habits :::These cone snails are vermivorous, meaning that the cones prey on a broad variety of polychaete worms, including enteropneust, eunicid, terebellid, cirratulid, maldanid, and nereid worms, and hemichordates.〔 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「Lividoconus」の詳細全文を読む スポンサード リンク
|