ancestral 专八GRE

The branching points of the cladogram may be regarded either as an ancestral species (as in an evolutionary tree) or solely as representing shared characteristics.

在这形象化进化树上，每两间距离都是由它们共有特性来决定。

The special body plan of Yunnanozoon is almost identical to that of the living enteropneust hemichordate Balanoglossus,which suggests that the earlyCambrian creature is ancestral to the hemichordates.

这独特身体造型与现生肠鳃类半索动几无二致，从而表明这早寒武世动是地球上半索动门中已知最老祖先类型。