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''Walcottoceras'' is a cephalopod genus from the Lower Ordovician included in the ellesmerocerid family Protocycloceratidae according Rousseau Flower in 1964. The shell of ''Walcottoceras'' is small, slender, compressed, with prominent annuli (complete encircling ribs or costae); may be straight or slightly endogastric. Could be said to be an annulate ''Ectenolites''. ''Walcottoceras'' has been found in the Lower Ordovician of British Columbia, Alberta, Utah, and New York. ==References== *Rousseau H Flower, 1964. The Nautiloid Order Ellesmeroceratida (Cephalopoda), Memori 12. State Bureau of Mines and Mineral Resourecues. Socorro, New Mexico *( ''Walcottoceras'' ) Fossilworks 16 Oct 2014. *Jack Sepkoski, 2000. ( List of cephalopod genera ) 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「Walcottoceras」の詳細全文を読む スポンサード リンク
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