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''Litoceras'' is a trocholitid (Tarphycerida) genus that has been found in the Lower and Middle Ordovician of Newfoundland. Whorls in ''Litoceras'' have a broadly rounded cross section with its width greater than its height. Litoceras somewhat resembles the tarphyceratid ''Pionoceras'' from the same time, except for the siphuncle being dorsal and in the center. ==Species== Species within the genera ''Litoceras'' include: * ''Litoceras calciferum'' Billings, 1865 * ''Litoceras versutum'' Billings, 1865 * ''Litoceras whiteavsi'' Hyatt, 1894 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「Litoceras」の詳細全文を読む スポンサード リンク
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