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The origin and early phylogenetic history of jawed vertebrates
Open accessAbstract
Fossils of early gnathostomes (or jawed vertebrates) have been the focus of study for nearly two centuries. They yield key clues about the evolutionary assembly of the group's common body plan, as well the divergence of the two living gnathostome lineages: the cartilaginous and bony vertebrates. A series of remarkable new palaeontological discoveries, analytical advances and innovative reinterpretations of existing fossil archives have fundamentally altered a decades-old consensus on the relationships of extinct gnathostomes, delivering a new evolutionary framework for exploring major questions that remain unanswered, including the origin of jaws.
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Cites
The Development of the Vertebrate Skull
(1938) · Nature · doi:10.1038/142004a0 · Cited by 1,425
Basic Structure and Evolution of Vertebrates.
Weitzman, S. H., & Jarvik, E. (1981) · Systematic Zoology · doi:10.2307/2413058 · Cited by 826
Janvier, P. (1996) · doi:10.1093/oso/9780198540472.001.0001 · Cited by 792
Bonde, N., Greenwood, P. H., & Patterson, C. (1974) · Systematic Zoology · doi:10.2307/2412482 · Cited by 704
Recent Advances in the Origin and Early Radiation of Vertebrates
Daeschler, E. B. (2005) · Journal of Vertebrate Paleontology · doi:10.1671/0272-4634(2005)025[0478:r]2.0.co;2 · Cited by 507
The Origin and Evolution of Mammals
Kemp, T. S. (2004) · Oxford University Press eBooks · doi:10.1093/oso/9780198507604.001.0001 · Cited by 497
Agnathans and the origin of jawed vertebrates
Forey, P. L., & Janvier, P. (1993) · Nature · doi:10.1038/361129a0 · Cited by 378
Conodont affinity and chordate phylogeny
DONOGHUE, P. C. J., FOREY, P. L., & ALDRIDGE, R. J. (2000) · Biological Reviews of the Cambridge Philosophical Society · doi:10.1017/s0006323199005472 · Cited by 328
Wagner, G. P., & Lynch, V. J. (2010) · Current Biology · doi:10.1016/j.cub.2009.11.010 · Cited by 311
A Silurian placoderm with osteichthyan-like marginal jaw bones
Zhu, M., Yu, X., Ahlberg, P., Choo, B., Lü, J., Qiao, T., Qu, Q., Zhao, W., Jia, L., Blom, H., et al. (2013) · Nature · doi:10.1038/nature12617 · Cited by 307
Heimberg, A. M., Sallari, R. C., Sémon, M., Donoghue, P. C. J., & Peterson, K. J. (2010) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.1010350107 · Cited by 293
Early vertebrates and related problems of evolutionary biology
Chang, M.-M., Yu-hai, L., Zhang, G., & Rumei, Z. (1991) · Cited by 275
Evolution of Dermal Skeleton and Dentition in Vertebrates
Reif, W. (1982) · Springer eBooks · doi:10.1007/978-1-4615-6968-8_7 · Cited by 268
The braincase and jaws of a Devonian ‘acanthodian’ and modern gnathostome origins
Brazeau, M. (2009) · Nature · doi:10.1038/nature07436 · Cited by 248
Self-citationThe oldest articulated osteichthyan reveals mosaic gnathostome characters
Zhu, M., Zhao, W., Jia, L., Lü, J., Qiao, T., & Qu, Q. (2009) · Nature · doi:10.1038/nature07855 · Cited by 238
The phylogeny of the Craniata, with particular reference to the significance of fossil “agnathans”
Janvier, P. (1981) · Journal of Vertebrate Paleontology · doi:10.1080/02724634.1981.10011886 · Cited by 210
Hagfish embryology with reference to the evolution of the neural crest
Ota, K. G., Kuraku, S., & Kuratani, S. (2007) · Nature · doi:10.1038/nature05633 · Cited by 196
Acanthodes and shark-like conditions in the last common ancestor of modern gnathostomes
Davis, S. P., Finarelli, J. A., & Coates, M. I. (2012) · Nature · doi:10.1038/nature11080 · Cited by 189
A primitive fossil fish sheds light on the origin of bony fishes
Zhu, M., Yu, X., & Janvier, P. (1999) · Nature · doi:10.1038/17594 · Cited by 168
The oldest articulated chondrichthyan from the Early Devonian period
Miller, R. F., Cloutier, R., & Turner, S. (2003) · Nature · doi:10.1038/nature02001 · Cited by 162
Initial radiation of jaws demonstrated stability despite faunal and environmental change
Anderson, P. S. L., Friedman, M., Brazeau, M. D., & Rayfield, E. J. (2011) · Nature · doi:10.1038/nature10207 · Cited by 153
Self-citationFossil jawless fish from China foreshadows early jawed vertebrate anatomy
Gai, Z., Donoghue, P. C. J., Zhu, M., Janvier, P., & Stampanoni, M. (2011) · Nature · doi:10.1038/nature10276 · Cited by 150
A primitive placoderm sheds light on the origin of the jawed vertebrate face
Dupret, V., Sanchez, S., Goujet, D. F., Tafforeau, P., & Ahlberg, P. (2014) · Nature · doi:10.1038/nature12980 · Cited by 150
Watson, D. M. S. (1937) · Philosophical transactions of the Royal Society of London. Series B, Biological sciences · doi:10.1098/rstb.1937.0009 · Cited by 150
Osteolepiforms and the ancestry of tetrapods
Ahlberg, P., & Johanson, Z. (1998) · Nature · doi:10.1038/27421 · Cited by 149
Elements of comparative anatomy
Lankester, E. R., Bell, F. J., & Gegenbaur, C. (1878) · Macmillan eBooks · doi:10.5962/bhl.title.106950 · Cited by 148
The cephalaspids of Great Britain,
Stensiö, E. A. (1932) · Printed by order of the Trustees of the British Museum eBooks · doi:10.5962/bhl.title.118830 · Cited by 142
CHARACTER DIAGNOSIS, FOSSILS AND THE ORIGIN OF TETRAPODS
Panchen, A. L., & Smithson, T. R. (1987) · Biological reviews/Biological reviews of the Cambridge Philosophical Society · doi:10.1111/j.1469-185x.1987.tb01635.x · Cited by 139
Craniofacial development of hagfishes and the evolution of vertebrates
Oisi, Y., Ota, K. G., Kuraku, S., Fujimoto, S., & Kuratani, S. (2012) · Nature · doi:10.1038/nature11794 · Cited by 137
Osteichthyan-like cranial conditions in an Early Devonian stem gnathostome
Giles, S., Friedman, M., & Brazeau, M. (2015) · Nature · doi:10.1038/nature14065 · Cited by 136
Self-citationPlacoderms (Armored Fish): Dominant Vertebrates of the Devonian Period
Young, G. C. (2010) · Annual Review of Earth and Planetary Sciences · doi:10.1146/annurev-earth-040809-152507 · Cited by 135
The relationships of placoderm fishes
Young, G. C. (1986) · Zoological Journal of the Linnean Society · doi:10.1111/j.1096-3642.1986.tb00876.x · Cited by 123
Copulation in antiarch placoderms and the origin of gnathostome internal fertilization
Long, J. A., Mark‐Kurik, E., Johanson, Z., Lee, M. S. Y., Young, G. C., Min, Z., Ahlberg, P., Newman, M. J., Jones, R., den Blaauwen, J. L., et al. (2014) · Nature · doi:10.1038/nature13825 · Cited by 122
A primitive sarcopterygian fish with an eyestalk
Zhu, M., Yu, X., & Ahlberg, P. (2001) · Nature · doi:10.1038/35065078 · Cited by 121
A new stethacanthid chondrichthyan from the lower Carboniferous of Bearsden, Scotland
Coates, M. I., & SEQUEIRA, S. E. K. (2001) · Journal of Vertebrate Paleontology · doi:10.1671/0272-4634(2001)021[0438:anscft]2.0.co;2 · Cited by 119
Coates, M. I. (2003) · Theory in Biosciences · doi:10.1007/s12064-003-0057-4 · Cited by 113
Major events in early vertebrate evolution
Benton, M. J. (2001) · Lethaia · doi:10.1080/002411601753293033 · Cited by 111
Siluro-Devonian vertebrate biostratigraphy and biogeography of China
Zhao, W., & Zhu, M. (2009) · Palaeoworld · doi:10.1016/j.palwor.2009.11.007 · Cited by 105
A reappraisal of the origin and basal radiation of the Osteichthyes
Friedman, M., & Brazeau, M. (2010) · Journal of Vertebrate Paleontology · doi:10.1080/02724630903409071 · Cited by 104
Self-citationOta, K. G., Fujimoto, S., Oisi, Y., & Kuratani, S. (2011) · Nature Communications · doi:10.1038/ncomms1355 · Cited by 103
The characters of Palaeozoic jawed vertebrates
Brazeau, M., & Friedman, M. (2014) · Zoological Journal of the Linnean Society · doi:10.1111/zoj.12111 · Cited by 98
Self-citationLong, J. A., & Trinajstic, K. M. (2010) · Annual Review of Earth and Planetary Sciences · doi:10.1146/annurev-earth-040809-152416 · Cited by 98
Jaws and teeth of the earliest bony fishes
Botella, H., Blom, H., Dorka, M., Ahlberg, P., & Janvier, P. (2007) · Nature · doi:10.1038/nature05989 · Cited by 98
Young, G. C. (1980) · Palaeontographica Abteilung A · Cited by 96
Kuratani, S. (2004) · Journal of Anatomy · doi:10.1111/j.0021-8782.2004.00345.x · Cited by 93
Yu, X. (1998) · Journal of Vertebrate Paleontology · doi:10.1080/02724634.1998.10011055 · Cited by 93
Devonian arthrodire embryos and the origin of internal fertilization in vertebrates
Long, J. A., Trinajstic, K. M., & Johanson, Z. (2009) · Nature · doi:10.1038/nature07732 · Cited by 88
Styloichthys as the oldest coelacanth: Implications for early osteichthyan interrelationships
Friedman, M. (2007) · Journal of Systematic Palaeontology · doi:10.1017/s1477201907002052 · Cited by 87
Self-citationEvolution of the vertebrate jaw from developmental perspectives
Kuratani, S. (2012) · Evolution & Development · doi:10.1111/j.1525-142x.2011.00523.x · Cited by 84
FRAGLICHE ACTINOPTERYGIER‐SCHUPPEN AUS DEM SILUR GOTLANDS
Gross, W. (1968) · Lethaia · doi:10.1111/j.1502-3931.1968.tb01736.x · Cited by 79
(2011) · Wiley eBooks · doi:10.1002/9781119990475 · Cited by 78
Phylogeny, classification and character polarity of the Osteostraci (Vertebrata)
Sansom, R. S. (2009) · Journal of Systematic Palaeontology · doi:10.1017/s1477201908002551 · Cited by 77
Balfour, F. M. (1881) · Proceedings of the Zoological Society of London · doi:10.1111/j.1096-3642.1881.tb01323.x · Cited by 73
The most primitive osteichthyan braincase?
Basden, A. M., Young, G. C., Coates, M. I., & Ritchie, A. (2000) · Nature · doi:10.1038/35003183 · Cited by 72
A primitive actinopterygian neurocranium from the Early Devonian of southeastern Australia
Basden, A. M., & Young, G. C. (2001) · Journal of Vertebrate Paleontology · doi:10.1671/0272-4634(2001)021[0754:apanft]2.0.co;2 · Cited by 72
Origin of evolutionary novelty: Examples from limbs
Shubin, N. H. (2002) · Journal of Morphology · doi:10.1002/jmor.10017 · Cited by 71
A new evolutionary scenario for the vertebrate jaw
Shigetani, Y., Sugahara, F., & Kuratani, S. (2005) · BioEssays · doi:10.1002/bies.20182 · Cited by 64
Yet more reflections on agnathan-gnathostome relationships
Forey, P. L. (1984) · Journal of Vertebrate Paleontology · doi:10.1080/02724634.1984.10012013 · Cited by 63
Observations on the ptyctodont fish, Rhamphodopsis Watson
Miles, R. S. (1967) · Journal of the Linnean Society of London Zoology · doi:10.1111/j.1096-3642.1967.tb01398.x · Cited by 61
Pelvic and reproductive structures in placoderms (stem gnathostomes)
Trinajstic, K. M., Boisvert, C. A., Long, J. A., Maksimenko, A. S., & Johanson, Z. (2014) · Biological reviews/Biological reviews of the Cambridge Philosophical Society · doi:10.1111/brv.12118 · Cited by 58
A primitive chondrichthyan braincase from the Early Devonian of South Africa
Maisey, J. G., & Anderson, M. E. (2001) · Journal of Vertebrate Paleontology · doi:10.1671/0272-4634(2001)021[0702:apcbft]2.0.co;2 · Cited by 58
Davis, M. C., Shubin, N., & Daeschler, E. B. (2004) · Journal of Vertebrate Paleontology · doi:10.1671/1920-3 · Cited by 56
The larger arthrodiran fishes from the area of the Burrinjuck Dam, N.S.W.
White, E. I. (1978) · The Transactions of the Zoological Society of London · doi:10.1111/j.1096-3642.1978.tb00374.x · Cited by 54
Schultze, H. (1968) · Biodiversity Heritage Library (Smithsonian Institution) · Cited by 54
Maisey, J. G., Miller, R. F., & Turner, S. (2009) · Acta Zoologica · doi:10.1111/j.1463-6395.2008.00330.x · Cited by 53
Chondrichthyan‐like scales from the Middle Ordovician of Australia
Sansom, I. J., Davies, N. S., Coates, M. I., Nicoll, R. S., & Ritchie, A. (2012) · Palaeontology · doi:10.1111/j.1475-4983.2012.01127.x · Cited by 52
Theropod diversity and the refinement of avian characteristics
Makovicky, P. J., & Zanno, L. E. (2011) · Living Dinosaurs · doi:10.1002/9781119990475.ch1 · Cited by 50
Hanke, G. F., & Wilson, M. V. H. (2006) · Journal of Vertebrate Paleontology · doi:10.1671/0272-4634(2006)26[526:aoteda]2.0.co;2 · Cited by 49
The relationships of the Osteostraci and Galeaspida
Janvier, P. (1984) · Journal of Vertebrate Paleontology · doi:10.1080/02724634.1984.10012014 · Cited by 48
Phylogenetic relationships of galeaspids (Agnatha)
Zhu, M., & Gai, Z. (2007) · Frontiers in Biology · doi:10.1007/s11515-007-0022-6 · Cited by 48
The relationship of placoderms
GARDINER, B. G. (1984) · Journal of Vertebrate Paleontology · doi:10.1080/02724634.1984.10012017 · Cited by 43
Janvier, P., & Blieck, A. (1979) · Zoologica Scripta · doi:10.1111/j.1463-6409.1979.tb00640.x · Cited by 42
Pelvic claspers confirm chondrichthyan-like internal fertilization in arthrodires
Ahlberg, P., Trinajstic, K. M., Johanson, Z., & Long, J. A. (2009) · Nature · doi:10.1038/nature08176 · Cited by 41
New Acanthodians from the Delorme Formation (Lower Devonian) of N. W. T. Canada
Bernacsek, G. M., & Dineley, D. L. (1977) · Palaeontographica Abteilung A · Cited by 40
Basal Jawed Vertebrate Phylogenomics Using Transcriptomic Data from Solexa Sequencing
Chen, M., Zou, M., Yang, L., & He, S. (2012) · PLoS ONE · doi:10.1371/journal.pone.0036256 · Cited by 38
Dental patterning in the earliest sharks: Implications for tooth evolution
Maisey, J. G., Turner, S., Naylor, G. J. P., & Miller, R. F. (2013) · Journal of Morphology · doi:10.1002/jmor.20242 · Cited by 38
Lebedev, O. A., Lukševičs, E., & Zakharenko, G. V. (2009) · Palaeoworld · doi:10.1016/j.palwor.2009.12.003 · Cited by 34
Exoskeletal micro-remains of an Ordovician fish from the Harding Sandstone of Colorado
Smith, M. M., & Sansom, I. J. (1997) · Biodiversity Heritage Library (Smithsonian Institution) · doi:10.5281/zenodo.16577806 · Cited by 32
Karatajūtė‐Talimaa, V., & Предтеченский, Н. Н. (1995) · Biodiversity Heritage Library (Smithsonian Institution) · Cited by 32
Fossil Fishes from China Provide First Evidence of Dermal Pelvic Girdles in Osteichthyans
Zhu, M., Yu, X., Choo, B., Qu, Q., Jia, L., Zhao, W., Qiao, T., & Lü, J. (2012) · PLoS ONE · doi:10.1371/journal.pone.0035103 · Cited by 29
Schaeffer, B. (1981) · Biodiversity Heritage Library (Smithsonian Institution) · Cited by 27
Sansom, R. S. (2009) · Palaeontology · doi:10.1111/j.1475-4983.2009.00895.x · Cited by 27
Sansom, I. J., Wang, N.-Z., & Smith, M. M. (2005) · Zoological Journal of the Linnean Society · doi:10.1111/j.1096-3642.2005.00171.x · Cited by 26
A Reinterpretation of The Visceral Skeleton of Acanthodes
Miles, R. S. (1964) · Nature · doi:10.1038/204457a0 · Cited by 25
Contributions to the morphology of cladoselache (Cladodus)
Dean, B. (1894) · Journal of Morphology · doi:10.1002/jmor.1050090103 · Cited by 22
New evidence on the nature of the jaw suspension in Palaeozoic anacanthous sharks
Zangerl, R., & Williams, M. (1975) · Biodiversity Heritage Library (Smithsonian Institution) · doi:10.5281/zenodo.16022792 · Cited by 22
Internal anatomy of the polybranchiaspids (Agnatha, Galeaspida)
Halstead, L. B. (1979) · Nature · doi:10.1038/282833a0 · Cited by 18
Lukševičs, E., Lebedev, O. A., & Zakharenko, G. V. (2010) · Palaeoworld · doi:10.1016/j.palwor.2010.02.001 · Cited by 16
Hanke, G. F., Wilson, M. V. H., & Saurette, F. (2013) · Geodiversitas · doi:10.5252/g2013n3a2 · Cited by 8
Flagged first, then by citations
1 of the 90 references couldn’t be matched to a known paper.
Research works printed but not linked: 15
- Watson, D. M. S. The acanthodian fishes. Philos. Trans. R. Soc. Lond. 228, 49–146 (1937).
- Gregory, W. K. Further observations on the pectoral girdle and fin of Sauripterus taylori Hall, a crossopterygian fish from the Upper Devonian of Pennsylvania, with special reference to the origin of the pentadactylate extremities of Tetrapoda. Proc. Am. Phil. Soc. 75, 673–690 (1935).
- Clack, J. A. Gaining Ground (Indiana Univ. Press, 2012).
- Karatajute-Talimaa, V. N., Novtistkaya, L. I., Rozman, K. S. & Sodov, J. Mongolepis, a new genus of Elasmobranchii from the Lower Silurian of Mongolia. Paleontologicheskii zhurnal 1, 76–86 (1990).
- Janvier, P. & Maisey, J. G. in Morphology, Phylogeny and Paleobiogeography of Fossil Fishes (eds Elliott, D. K., Maisey, J. G., Yu, X. & Miao, D.) 431–459 (Dr Freidrich Pfeil, 2010).
- Märss, T., Turner, S. & Karatajute-Talimaa, V. in Handbook of Paleoichthyology Vol. 1B (ed. Schultze, H.-P.) (Dr Friedrich Pfeil, 2007).
- Stensiö, E. A. The Devonian and Downtonian vertebrates of Spitsbergen. Part 1. Family Cephalaspidae. Skr. Svalbard Ishav. 12, 1–391 (1927).
- Schaeffer, B. in Problèmes Actuels de Paléontologie: Evolution des Vertébrés Vol. 218 [in French] (ed. Lehman, J.-P.) 101–109 (Colloques internationaux du Centre national de la Recheche scientifique, 1975).
- Zhu, M. Catalogue of Devonian vertebrates in China, with notes on bio-events. Cour. Forsch. Inst. Senckenberg 223, 379–390 (2000).
- Coates, M. I. & Sequiera, S. E. K. in Major Events in Early Vertebrate Evolution (ed. Ahlberg, P. E.) 241–262 (Taylor & Francis, 2001).
- Maisey, J. G. in Major Events in Early Vertebrate Evolution (ed. Ahlberg, P. E.) 263–288 (Taylor & Francis, 2001).
- Hanke, G. F. & Wilson, M. V. H. in Morphology, Phylogeny and Paleobiogeography of Fossil Fishes (eds Elliott, D. K., Maisey, J. G., Yu, X. & Miao, D.) 149–182 (Dr Friedrich Pfeil, 2010).
- Schaeffer, B. The xenacanth shark neurocranium, with comments on elasmobranch monophyly. Bull. Am. Mus. Nat. Hist. 169, 1–66 (1981).
- Turner, S. in Recent Advances in the Origin and Early Radiation of Vertebrates (eds Arratia, G., Wilson, M. V. H. & Cloutier, R.) 67–94 (Dr Friedrich Pfeil, 2004).
- Schultze, H.-P. & Cumbaa, S. L. in Major Events in Early Vertebrate Evolution (ed. Ahlberg, P. E.) 315–332 (Taylor & Francis, 2001).
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Metadata
- Authors
- Brazeau, M. D., & Friedman, M.
- Affiliations
- Imperial College London (GB)
- University of Oxford (GB)
- Corresponding author
- Brazeau, Martin D.
- Friedman, Matt
- Venue
- Nature
- Published
- 2015-04-22
- Volume
- 520
- Issue
- 7548
- Pages
- 490-497
- ISSN
- 0028-0836 (ISSN-L)
- 1476-4687
- PMC
- PMC4648279
- OpenAlex
- W2030900050
- Cited by
- 227
- References
- 90
- Citations by year
- 2026: 20 · 2025: 21 · 2024: 23 · 2023: 15 · 2022: 30 · 2021: 24 · 2020: 21 · 2019: 21 · 2018: 14 · 2017: 15 · 2016: 16 · 2015: 6
- FWCI
- 2.14
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Nature (publishedVersion)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- RePEc: Research Papers in Economics (submittedVersion)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Evolutionary Biology
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Evolution and Paleontology Studies
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
- Keywords
- jawed vertebrates, gnathostomes, phylogenetic relationships, fossil vertebrates, vertebrate evolution, body plan evolution
- MeSH terms
- Animals, Fossils, Jaw, Phylogeny, Vertebrates
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