hemichordate

1.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生肠鳃几无二致，从而表明这早寒武世是地球上门中已知最古老的祖先型。