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''Calliostoma canaliculatum'', common name the channeled topsnail, is a species of small sea snail with gills and an operculum, a marine gastropod mollusk in the family Calliostomatidae, the calliostoma top snails.〔WoRMS (2010). ''Calliostoma canaliculatum'' (Lightfoot, 1786). In: Bouchet, P.; Gofas, S.; Rosenberg, G. (2010) World Marine Mollusca database. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=580410 on 2010-05-21〕 The name of the species ''Calliostoma canaliculatum'' (Sasao & Habe, 1973) is preoccupied in ''Calliostoma'', by ''Calliostoma canaliculatum'' (Lightfoot, 1786), but not in ''Tristichotrochus'', which is where it is placed by some authors. It is currently a secondary homonym but it has not replaced the preoccupied name because the replacement name would be synonymized sooner or later. ==Description== Size of the shell varies between 16 mm and 39 mm. Shell white to buff with raised spiral ribs, interspaces brownish, a small blue stain adjacent to the columnella. Height 15 to 35 mm.〔Marine Shells of Southern California, by James H. McLean, Natural History Museum of Los Angeles County, Science Series 24, Revised Edition (1978), p. 19〕 The thin, imperforate shell has a conical shape with a flat base It is fawn colored with yellowish white lirae. The surface of the whorls is encircled by numerous sharply sculptured, smooth, narrow, cord-like lirae, subequal or alternately smaller. The base contains 11 to 13 similar ones. On the upper whorls the lirae are fewer, and in well preserved individuals the second whorl is minutely beaded above. The spire is conic, with nearly straight outlines. The sutures are impressed. The spire contains 7-8 whorls, with the last obtusely angular, flat beneath and impressed around the axis. The oblique aperture is rhombic, iridescent and sulcated inside. The thin peristome is acute. The columella is straightened, not truncate below, dilated in a pearly iridescent pad above, bounded by an opaque white deposit.〔(Tryon (1889), Manual of Conchology XI, 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「Calliostoma canaliculatum」の詳細全文を読む スポンサード リンク
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