纲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
半索动
几无二致，从而表明这
早寒武世动是地球上半索动
已知最古老的祖先型。
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