References / paperThe oldest articulated osteichthyan reveals mosaic gnathostome characters
Zhu, M.; Zhao, W.; Jia, L.; Lu, J.; Qiao, T.; Qu, Q.
Year2009
Source roleprimary-study
DOI / ID10.1038/nature07855
Fitness and scope
taxonomy · topology · range · morphology · geochronology
Primary description of articulated Ludlow sarcopterygian Guiyu oneiros; the paper also distinguishes the fossil occurrence from the inferred minimum actinopterygian–sarcopterygian split.
Claim ledger
fossil-range · highThe Sarcopterygii navigation envelope uses the articulated Ludlow Guiyu oneiros specimen at approximately 419 Ma as its evidence-linked older anchor and living sarcopterygians at 0 Ma as its younger edge; the fossil is neither a direct ancestor nor proof of an exact global first appearance.
claim:taxon:sarcopterygii:fossil-range