左右对称卵裂 bilateral cleavage

互联网2013-11-14

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左右对称卵裂 bilateral cleavage 是动物卵裂的特殊型，即对正中面，卵裂面呈左右对称排列。无论是卵黄多的大形头足类的部分卵裂，还是卵黄少的小形的海鞘的完全卵裂，均可看到这样卵裂形式。此外属于放射型的两栖类卵和螺旋型的蛔虫卵，也是表现为左右对称型。

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