synapomorphy A morphological character shared by different species and used to group them into the same species group, genus, or higher taxon. Diagnoses a clade or monophyletic group.

• 共衍徵被不同种共享的一个形态学上的特徵，且用来聚集它们已进入相同的种群、属或较高的分类单元。判断一个演化支或单源群。