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.

这种独特的身体造型与现肠鳃类索动物几无二致，从而表明这早寒武世动物是地球上索动物门中已知最古老的祖先类型。