A calcareous plate or pair of plates found in the terminal chamber of some ammonites.
| 单词 | θ33302 |
| 释义 | the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > class Cephalopoda > [noun] > order Tetrabranchiata > family Ammonitidae > member of > calcareous plate (1) aptychus1877 A calcareous plate or pair of plates found in the terminal chamber of some ammonites. |
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