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.
taxonomy · topology · range · morphology
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.
The atlas begins the historical Agnatha navigation grade at a rounded 520 Ma to include the Chengjiang Myllokunmingia and Haikouichthys specimens described as agnathan-grade vertebrates; 0 Ma reflects living cyclostomes in the display group, not a monophyletic crown range, global first appearance or direct ancestry.
claim:taxon:agnatha:fossil-range