monophyletic

clade A group defined by at least one shared derived character or synapomorphy inherited from a common ancestor; a monophyletic higher taxon, a branch on a cladogram.

进化枝由先演化产生生物群在演化分枝图上一个分支。

polyphyletic Refers to a group of species that do not have one common ancestor species. Species may be grouped polyphyletically as a convenience until a monophyletic classification can be made.

复系是没有一个先一族群。在便利性之下，种可能是来自多个先谱系群集，直到一个单源分类能被创立。