^Here, the hagfish are treated as a separate clade, as in Sweet and Donoghue's 2001 tree produced without cladistic analysis.[2] However, it has been recognised by some [3] that the hagfish and lampreys may be closer to one another in their own clade, the Cyclostomata.
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^Bourlat, S. J; T. Juliusdottir, C. J Lowe, R. Freeman, J. Aronowicz, M. Kirschner, E. S Lander, M. Thorndyke, H. Nakano, A. B Kohn, others (2006). "Deuterostome phylogeny reveals monophyletic chordates and the new phylum Xenoturbellida". Nature. 444 (7115). ss. 85-88. doi:10.1038/nature05241. ISSN0028-0836. PMID17051155.KB1 bakım: Birden fazla ad: yazar listesi (link)
Aldridge, R. J.; Briggs, D. E. G.; Smith, M. P.; Clarkson, E. N. K.; Clark, N. D. L. (1993). "The anatomy of conodonts". Philosophical Transactions of the Royal Society of London, Series B. Cilt 340. s. 405–421. doi:10.1098/rstb.1993.0082.
Donoghue, P. C. J.; Forey, P. L.; Aldridge, R. J. (2000). "Conodont affinity and chordate phylogeny". Biological Reviews. 75 (2). ss. 191-251. doi:10.1017/S0006323199005472. PMID10881388.
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