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Mackinnonia
| authority = Runnegar 1980 |subdivision = }} ''Mackinnonia'' is a genus of small shelly fossil comprising straight or slightly coiled shells of the helcionelloid type. The outer surface of their shell is smooth, whereas the inner surface has a net-like ridges.〔 They are known from late Early Cambrian rocks across North America and Greenland.〔 == References ==
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「Mackinnonia」の詳細全文を読む
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