From Wikipedia, the free encyclopedia
並系群（paraphyletic group）係親緣關係學上嘅一個概念。如果話一柞生物物種成一個並系群，意思即係話呢個群包括咗呢柞物種嘅最近共同祖先（last common ancestor）以及嗰個祖先除咗某一兩個單系群之外嘅所有後代物種。
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