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鳍足是在一些雄性动物身上发现的一种常用于交配的器官。
雄性软骨鱼纲的鳍足是由其后部的腹鳍形成的，是用来将精子送入雌性泄殖腔的插入器。在交配时，雄性的鳍足会先吸入水，然后连带精子一起射入雌性的泄殖腔中。[1][2]
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