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1956, D. R. Newth, “On the Neural Crest of the Lamprey Embryo”, in Journal of Embryology and Experimental Morphology, volume 4, page 358:
Thus should the cranial neural crest in cyclostomes prove to be non-skeletogenous this might be a reflection either of its own primitiveness or of the different evolutionary origins and morphological status of the visceral skeleton in agnathans and gnathostomes.
1992, Peter J. Hanley et al., “Hagfish Humoral Defense Protein Exhibits Structural and Functional Homology with Mammalian Complement Components”, in Proceedings of the National Academy of Sciences, volume 89, page 7910:
The hagfish is an agnathan, a modern representative of the earliest evolved group of vertebrates, the ostracoderms or jawless fishes, which arose prior to the ancient placoderms (3).
