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Mariella
''Mariella'' is an ammonoid genus, named by Nowak (1916) from the upper Albian and Cenomanian stages of the mid Cretaceous, included in the Turrilitidae. Its type is ''Turrilites bergeri'' ==Description== ''Mariella'' resembles ''Turrilites'' in general form. The shell is asymmetric, closely wound in a long expanding trochoidal spire. Ribs are slightly oblique and are rather feeble, each with 4 more or less equally spaced tublercles. ''Turrilites'' differs primarily in being more strongly ribbed and in having a more oval aperture.
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「Mariella」の詳細全文を読む
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