1.一源的,单种的
2.由同一新型演化的
1.describes a group of plants or animals that are descended from a single stock or ancestral form
1.The tribe Anatini was a monophyletic group which formed a separate clade during the evolution of Anatinae. 3.
河鸭族为一单系发生群,在系统演化中形成独立的一支。
2.Diagnoses a clade or monophyletic group.
判断一个演化支或单源群。