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Flemingites
''Flemingites'' is an evolute ammonoid from the Lower Triassic with spiral ridges on the shell. ==Diagnosis== The shell of ''Flemingites'' is evolute so that all whorls show externally. Whorls are robust, slightly embracing, usually a little higher than wide and increasing very slowly. The venter (outside rim) is somewhat flattened and usually much narrower that the widest part of the whorl. Strong, always single, lateral ribs are confined to the sides. Fine spiral ridges typically cover the shell, found even in casts. The suture is distinctly ceratitic with rounded entire saddles and deep serrated lobes.〔James Perrin Smith, 1932. Lower Triassic Ammonoids of North America. USGS PP 167.〕
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「Flemingites」の詳細全文を読む
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