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''Cassis'', common name the helmet shells, is a genus of very large sea snails, marine gastropod mollusks in the family Cassidae, the helmet shells and their allies. This is the type genus of the subfamily Cassinae. ==Species== The genus ''Cassis'' includes 11 extant species and about 20 extinct species:〔〔 ( Fossilworks )〕 * ''Cassis abbotti'' Bouchet, 1988 * ''Cassis altispira'' Beu 2010† * ''Cassis birmanica'' Vredenburg 1921† * ''Cassis cornuta'' (Linnaeus, 1758) * ''Cassis costulifera'' Beu 2010† * ''Cassis delta'' Parker 1948† * ''Cassis depressior'' Martin 1879† * ''Cassis fimbriata'' Quoy & Gaimard, 1833 * ''Cassis flammea'' Linnaeus, 1758 * ''Cassis flintensis'' Mansfield 1940† * ''Cassis floridensis'' Tucker and Wilson 1932† * ''Cassis glaucoides'' Martin 1879† * ''Cassis herklotsi'' Martin 1879† * ''Cassis ketteri'' Parodiz and Tripp 1992† * ''Cassis kreipli'' Morrison, 2003 * ''Cassis maccormacki'' Olsson 1928† * ''Cassis madagascariensis'' Lamarck, 1822 * ''Cassis mammillaris'' Grateloup 1927† * ''Cassis nana'' Tenison-Woods, 1879 * ''Cassis norai'' Prati Musetti, 1995 * ''Cassis nummulitiphila'' Sacco 1890 * ''Cassis patamakanthini'' Parth, 2000 * ''Cassis retusa'' Michelotti 1861 * ''Cassis subtuberosa'' Hanna 1926 * ''Cassis sulcifera'' Sowerby 1850 * ''Cassis tessellata'' Gmelin, 1791 * ''Cassis togata'' White 1887 * ''Cassis tuberosa'' Linnaeus, 1758 * ''Cassis vialensis'' Fuchs 1870 Fossils of the sea snails within this genus have been found all over the world in sediments from Paleocene to Recent (age range: 66 to 0 million years ago).〔 Species brought into synonymy:〔 * ''Cassis achatina'' Lamarck, 1816: synonym of ''Semicassis labiata'' (Perry, 1811) * ''Cassis areola'' (Linnaeus, 1758): synonym of ''Phalium areola'' (Linnaeus, 1758) * ''Cassis bituberculosa'' Martens, 1901: synonym of ''Echinophoria bituberculosa'' (Martens, 1901) * ''Cassis callosa'' Röding, 1798: synonym of ''Nassarius gibbulosus'' (Linnaeus, 1758) * ''Cassis centiquadrata (''Valenciennes, 1832): synonym of ''Semicassis centiquadrata'' (Valenciennes, 1832) * ''Cassis cernica'' Sowerby III, 1888: synonym of ''Casmaria ponderosa ponderosa'' (Link, 1807) * ''Cassis coarctata'' G.B. Sowerby I, 1825: synonym of ''Cypraecassis coarctata'' (G.B. Sowerby I, 1825) * ''Cassis coronadoi'' Crosse, 1867: synonym of ''Echinophoria coronadoi'' (Crosse, 1867) * ''Cassis dalli'' Anderson, 1929: synonym of ''Echinophoria hadra'' (Woodring & Olsson, 1957) * ''Cassis glans'' Röding, 1798: synonym of ''Demoulia abbreviata'' (Gmelin, 1791) * ''Cassis glauca'' (Linnaeus, 1758): synonym of ''Phalium glaucum'' (Linnaeus, 1758) * ''Cassis globulus'' Menke, 1829: synonym of ''Demoulia ventricosa'' (Lamarck, 1816) * ''Cassis gracilenta'' Yokoyama, 1928: synonym of ''Cyllene gracilenta'' (Yokoyama, 1928) * ''Cassis japonica'' Reeve, 1848: synonym of ''Semicassis bisulcata'' (Schubert & Wagner, 1829) * ''Cassis labrosa'' Martini, 1773: synonym of ''Malea pomum'' (Linnaeus, 1758) * ''Cassis ringens'' Swainson, 1822: synonym of ''Malea ringens'' (Swainson, 1822) * ''Cassis rufa'' (Linnaeus, 1758): synonym of ''Cypraecassis rufa'' (Linnaeus, 1758) * ''Cassis spinosa'' (Gronovius, 1781): synonym of ''Cassis tessellata'' Gmelin, 1791 * ''Cassis tenuis'' Wood, 1828: synonym of ''Cypraecassis tenuis'' (Wood, 1828) * ''Cassis vibex'' (Linnaeus, 1758): synonym of ''Casmaria erinaceus'' (Linnaeus, 1758) * ''Cassis wyvillei'' Watson, 1886: synonym of ''Echinophoria wyvillei'' (Watson, 1886) 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「Cassis (gastropod)」の詳細全文を読む スポンサード リンク
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