A New Vetulicolian from the Early Cambrian Chengjiang Fauna in Yunnan of China

摘要

The genus and species Yuyuanozoon magnificissimi gen. et sp. nov., a new fossil vetulicolian, is reportedfrom the Early Cambrian Chengjiang Fauna in Yunnan of China. It has a bipartite body plan and five pairs of chain-formedgill sacs, showing the general characteristics of Ventulicolia. However, the exclusive "atrial cavity" and external gillobserved indicate that the new form is different from those previously described as vetulicolians, probably representing alineage developed within deuterostomes and more primitive than urochordates.