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Hoplonemertea

1、针纽目

（3）针纽目（Hoplonemertea）：所有吻具刺地纽虫均属本目，体壁肌肉二层，分别为外环肌、内纵肌、神经位于间质中（即体壁肌肉层之内），具中背血管、海水、...

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