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来自维基百科,自由的百科全书
外群(英语:Outgroup),或称外类群,是一个分支系统学概念,指与所有近缘单系群(两个及以上)关系都较远的类群(group),这意味着该群在演化过程中从母群分支出去的时间要早于其他群。
下面举出一些例子,其外类群标示在右边:
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