| 单词 | Atrypa | 
| 释义 | Atrypanoun  Atry·pa   ə‧ˈtrīpə   : a genus of extinct Silurian and Devonian plicate-shelled or costate-shelled brachiopods having the plates of the brachidium produced into spirally rolled processes with the apices usually directed toward the plane of symmetry of the valve   | 
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