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Anisoceras
''Anisoceras'' is a heteromorph ammonite belonging to the turrilitacean family Anisoceratidae. The shell forms a loose open helical spiral in the early stages, ending in one or two straight shafts in the mature adult. Surface ornament consists of prominent rounded nodes on the lower and upper flanks, connected by strong looped ribs. The nodes may have been the bases of long sharp spines. ==References==
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*Marcinowski and Wiedmann. The Albian Ammonites of Poland. Palaeontologia Polonica no. 50, 1990 * (The Paleobiology Database ''Anisoceras'' entry )
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「Anisoceras」の詳細全文を読む
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