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Trochina
The Trochina is a taxon that is used by paleontologists. It is a suborder of primitive sea snails, marine gastropod mollusks. ==Description== These snails have mostly conically coiled shells in which the spire is typically low to moderate in height. More rarely the shell is discoidal in coiling. The outer lip simple. The internal layers of the shell are aragonitic and nacreous, in some species completely so. The operculum, where known, is calcareous or corneous, and spiral in structure.〔Knight J. B. et al. (1960). Systematic Descriptions, Treatise on Invertebrate Paleontology. Part I(1).〕
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「Trochina」の詳細全文を読む
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