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Topaginella
''Topaginella'' is a genus of minute fossil sea snails, marine gastropod mollusks or micromollusks in the family Cystiscidae. Like all of the related genera, this genus is sometimes still classified in the family Marginellidae. This genus is extinct. ==Shell description == Shell minute, pyriform, strongly narrowed anteriorly; spire low; lip thickened, strongly denticulate; external varix probably absent (needs to be confirmed); distinct axial costae present; siphonal notch absent; columella multiplicate, with combined total of usually 8 plications plus parietal lirae.
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「Topaginella」の詳細全文を読む
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