cephalochordata meaning in English

全索亚门
头索动物亚门
头索亚门
无头亚门

Amphioxus , an existing animal that belongs to the phylum chordata , subphyla cephalochordata , is always regarded as the invertebrates which is the nearest to the vertebrates . it has great sense on the research of how the vertebrates develop from invertebrates
长久以来，文昌鱼一直被认为是现存的与脊椎动物亲缘关系最近的无脊椎动物( stokeandholland , 1998 ; zhangetal . , 2001 ) ，在脊椎动物如何由无脊椎动物进化而来这一著名的生物学难题中占据重要的位置。
The former is a kind of brachiopod and the latter belongs to vermes . the fossils of each sub - dominant species took its place from three percent to five percent in quantity . on one hand , the fossils of early vertebrata , hemichordata , urochordata , cephalochordata and vetulicolian which connects invertebrata and vertebrata have been caught one by one in the continuous excavating work of early life institute field work team of north west university since 1996
他们还认为节肢动物长尾纳罗虫( naraoialongicaudata ) 、刺状纳罗虫( naraoiospinosa )和耳形等刺虫( isoxysauritus )以及腕足动物东方日射水母贝( heliomedusaorienta ) 、线形虫动物圆筒帽天山蠕虫( maotianshaniacylindrica )均为次优势种，它们的个体数量分别占化石总数的百分之三到五。