ammonoid zone 菊石带
ammonoid fauna 菊石动物群
ammonoid fossil 菊石化石
ammonoid facies 菊石相
ammonoid assemblage 菊石组合
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同义词: ammonite
以上来源于: WordNet
After each extinction, a rich variety of ammonoid species and body plans was replaced by a few free-floating types.
在每次物种灭绝之中,大量的菊石和体平面为少量浮游动物所替代。
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