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来自维基百科,自由的百科全书
外群(英語:Outgroup),或稱外類群,是一個分支系統學概念,指與所有近緣單系群(兩個及以上)關係都較遠的類群(group),這意味着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:
Seamless Wikipedia browsing. On steroids.
Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.
Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.