虽然如今用鳃呼吸的腔棘鱼已不再使用这些结构

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虽然如今用鳃呼吸的腔棘鱼已不再使用这些结构，但对已经变成化石的古腔棘鱼物种来说，研究者认为，这些盘状结构在调控肺活量中曾经起过一定作用，后来随着该物种适应了深水环境，这些结构的作用最终也消失了。
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