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Aspinoceras : ウィキペディア英語版
Aspinoceras

''Aspinoceras'' is an extinct heteromorph ammonite that lived during the Early Cretaceous. The shell small; starts off with a few loosely wound whorls not in contact followed by a short moderately curved shaft ending in a broad hook. Surface covered with mostly fine, close spaced ribs, with periodic larger ribs. In general form it resembles ''Ancyloceras''.
''Aspinoceras'' has been found in upper Hauterivian - lower Barremian formations in Europe and California.
==References==

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抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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