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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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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