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来自维基百科,自由的百科全书
外群(英语:Outgroup),或稱外類群,是一個分支系統學概念,指与所有近緣單系群(兩個及以上)關係都较远的類群(group),這意味著該群在演化過程中從母群分支出去的時間要早於其他群。
下面舉出一些例子,其外類群標示在右邊:
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