鲨鱼
鲨鱼是鲨总目（学名：Selachimorpha）动物个通称，属于软骨鱼纲中个板鳃亚纲，是一种古老个鱼，最早勒4亿2千万年前个志留纪就已经出现，到乃朝已经演化出约440个不同个种，划分为5目20科（由于分类学家个意见不一致）；大个20多米，小个只有10多厘米。
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