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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). 在四足動物精子形成過程中,兩棲類沒有頂躰顆粒,而爬行類、鳥類和哺乳類等羊膜動物均出現頂躰顆粒。