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两囊幼虫

名词解释题
2021-08-30 14:45
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海绵动物受精卵进行卵裂形成囊胚后,动物性极的小细胞向囊胚腔内生出鞭毛,另一端的大细胞中间形成一个开口,后来囊胚的小细胞由开口倒翻出来,里面小细胞具鞭毛的一侧翻到囊胚的表面,这样动物性极的一端为具鞭毛的小分裂球,植物性极的一端为不具鞭毛的大分裂球,此时从外形看形似有两个囊,故称之为两囊幼虫。


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