hemichordate

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.

这种独特身体造型与现生肠鳃类半索动物几无二致，从而表明这早寒武世动物是地球上半索动物门中已知最古老祖先类型。