(en) Thomas Cavalier-Smith, « A revised six-kingdom system of life », Biological reviews, vol. 73, no 3, , p. 203-266 (DOI10.1111/j.1469-185X.1998.tb00030.x).
(en) Alysha M. Heimberg, Richard Cowper-Sal·lari, Marie Sémon, Philip C. J. Donoghue et Kevin J. Peterson, « MicroRNAs reveal the interrelationships of hagfish, lampreys and gnathostomes and the nature of the ancestral vertebrate », Proceedings of the National Academy of Sciences, vol. 107, no 45, , p. 19379-19383 (DOI10.1073/pnas.1010350107).
(en) Stock D. & Whitt G.S., 1992. Evidence from 18S ribosomal RNA sequences that lampreys and hagfishes form a natural group. Science. 257 (5071) (7 August 1992): 787–9. DOI10.1126/science.1496398, PMID1496398.
(en) Terrill D.F., Henderson C.M. & Anderson J.S., 2018. New applications of spectroscopy techniques reveal phylogenetically significant soft tissue residue in Paleozoic conodonts†. J. Anal. At. Spectrom., 33, pages 992-1002, DOI10.1039/C7JA00386B..
google.fr
books.google.fr
A.M. Constant Duméril, 1806. Zoologie analytique, ou Méthode naturelle de classification des Animaux, rendue plus facile à l'aide de tableaux synoptiques. Imprimerie de H.L. Perronneau, Allais libraire, Paris (lire en ligne sur Google Livres).
nih.gov
ncbi.nlm.nih.gov
(en) Stock D. & Whitt G.S., 1992. Evidence from 18S ribosomal RNA sequences that lampreys and hagfishes form a natural group. Science. 257 (5071) (7 August 1992): 787–9. DOI10.1126/science.1496398, PMID1496398.