belemnites
英[be'ləmnaɪts]
美[be'ləmnaɪts]
- 箭石类
详细释义
名词 belemnite:
-
a conical calcareous fossil tapering to a point at one end and with a conical cavity at the other end containing (when unbroken) a small chambered phragmocone from the shell of any of numerous extinct cephalopods of the family Belemnitidae
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