放射卵裂 radial cleavage

互联网2013-11-14

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动物卵裂的一种类型。裂球沿着卵轴呈放射状排列。初期卵裂时，纵裂即经裂面均通过卵轴，卵裂面相互形成的角度随着卵裂的进行分成180°、90°、45°等。相反沿着卵轴的横裂即纬裂面都和卵轴垂直。具有此种卵裂的有海绵动物、腔肠动物（有刺胞类）、棘皮动物、原索动物和两栖动物等。

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