Yunnanozoon是半索动物的远祖  

Yunnanozoon──the Ancestor of Hemichordates

作　　者：舒德干[1] 张兴亮[1] 陈苓 

机构地区：[1]西北大学地质学系

出　　处：《西北大学学报（自然科学版）》1996年第1期68-68,74,共2页Journal of Northwest University（Natural Science Edition）

基　　金：国家自然科学基金

摘　　要：对澄江化石库中Ｙｕｎｎａｎｏｚｏｏｎ（云南虫）重新研究表明，其身体由吻、领和躯干三部分构成；躯干前段为具有成对鳃孔的咽腔，后段为消化区。这种独特的身体造型与现生肠鳃类半索动物几无二致，从而表明这个早寒武世动物是地球上半索动物门中已知最古老的祖先类型。Reinvestigation of Yunnanozoon libidos ftom the Chengjiang fossil Lagerstatte shows thatits body plan is composed of the proboscis,the collar,and the trunk consisting of the branchial regionwith pairs of gill pores and the alimentary region.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.Without notochord,it can not be assigned to chordates.

关 键 词：半索动物 化石库 早寒武世 云南虫 

分 类 号：Q915.1[天文地球—古生物学与地层学]