图谱把历史性的无颌类导航等级从约 5.20 亿年前开始，以纳入澄江生物群中被描述为无颌脊椎动物等级的 Myllokunmingia 与 Haikouichthys 标本；0 Ma 只表示该显示组包含现生圆口类，不代表单系冠群范围、全球首现或直系祖先。
claim:taxon:agnatha:fossil-rangeLower Cambrian vertebrates from south China
Shu, D.-G.; Luo, H.-L.; Conway Morris, S.; Zhang, X.-L.; Hu, S.-X.; Chen, L.; Han, J.; Zhu, M.; Li, Y.; Chen, L.-Z.
年份1999
来源角色primary-study
DOI / ID10.1038/46965
适用范围
taxonomy · 拓扑 · range · 形态
Primary descriptions of Myllokunmingia and Haikouichthys from the Chengjiang biota; their agnathan-grade interpretation is historical and does not establish a monophyletic Agnatha crown or direct ancestry.