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In the process of spermiogenesis of tetrapoda,acrosomal vesicle does not appear in amphibian,but acrosomal vesicle appears in amniota(reptile,birds and mammals). 在四足动物精子形成过程中,两栖类没有顶体颗粒,而爬行类、鸟类和哺乳类等羊膜动物均出现顶体颗粒。