A primitive fish close to the common ancestor of tetrapods and lungfish

Abstract

The relationship of the three living groups of sarcopterygians or lobe-finned fish (tetrapods, lungfish and coelacanths) has been a matter of debate1,2,3,4,5. Although opinions still differ, most recent phylogenies suggest that tetrapods are more closely related to lungfish than to coelacanths6,7,8,9,10. However, no previously known fossil taxon exhibits a concrete character combination approximating the condition expected in the last common ancestor of tetrapods and lungfish—and it is still poorly understood how early sarcopterygians diverged into the tetrapod lineage (Tetrapodomorpha)7 and the lungfish lineage (Dipnomorpha)7. Here we describe a fossil sarcopterygian fish, Styloichthys changae gen. et sp. nov., that possesses an eyestalk and which exhibits the character combination expected in a stem group close to the last common ancestor of tetrapods and lungfish. Styloichthys from the Lower Devonian of China bridges the morphological gap between stem-group sarcopterygians (Psarolepis and Achoania)10 and basal tetrapodomorphs/basal dipnomorphs. It provides information that will help in the study of the relationship of early sarcopterygians, and which will also help to resolve the tetrapod–lungfish divergence into a documented sequence of character acquisition.

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Figure 1: Styloichthys changae gen. et sp. nov., a primitive fossil fish close to the last common ancestor of tetrapods and lungfish.
Figure 2: Skull and shoulder girdle of Styloichthys.
Figure 3: Stratogram showing Styloichthys as the stem group of the clade Dipnomorpha + Tetrapodomorpha.

References

  1. 1

    Rosen, D. E., Forey, P. L., Gardiner, B. G. & Patterson, C. Lungfishes, tetrapods, paleontology and plesiomorphy. Bull. Am. Mus. Nat. Hist. 167, 159–276 (1981)

    Google Scholar 

  2. 2

    Schultze, H.-P. Comparison of hypotheses on the relationships of sarcopterygians. Syst. Biol. 43, 155–173 (1994)

    Article  Google Scholar 

  3. 3

    Janvier, P. Early Vertebrates (Oxford Univ. Press, Oxford, 1996)

    Google Scholar 

  4. 4

    Zardoya, R. et al. Searching for the closest living relative(s) of tetrapods through evolutionary analyses of mitochondrial and nuclear data. Mol. Biol. Evol. 15, 506–517 (1998)

    CAS  Article  Google Scholar 

  5. 5

    Zhu, M. & Schultze, H.-P. in Major Events in Early Vertebrate Evolution (ed. Ahlberg, P. E.) 289–314 (Taylor & Francis, London, 2001)

    Google Scholar 

  6. 6

    Maisey, J. G. Head and tails: a chordate phylogeny. Cladistics 2, 201–256 (1986)

    Article  Google Scholar 

  7. 7

    Ahlberg, P. E. A re-examination of sarcopterygian interrelationships, with special reference to the Porolepiformes. Zool. J. Linn. Soc. 103, 241–287 (1991)

    Article  Google Scholar 

  8. 8

    Cloutier, R. & Ahlberg, P. E. in Interrelationships of Fishes (eds Stiassny, M. L., Parenti, L. R. & Johnson, G. D.) 445–480 (Academic, San Diego, 1996)

    Google Scholar 

  9. 9

    Meyer, A. Molecular evidence on the origin of tetrapods and the relationships of the coelacanth. Trends Ecol. Evol. 35, 93–101 (1995)

    Google Scholar 

  10. 10

    Zhu, M., Yu, X. & Ahlberg, P. A primitive sarcopterygian fish with an eyestalk. Nature 410, 81–84 (2001)

    CAS  Article  Google Scholar 

  11. 11

    Yu, X. A new porolepiform-like fish, Psarolepis romeri, gen. et. sp. nov. (Sarcopterygii, Osteichthyes) from the Lower Devonian of Yunnan, China. J. Vert. Paleontol. 18, 261–274 (1998)

    Article  Google Scholar 

  12. 12

    Zhu, M., Yu, X. & Janvier, P. A primitive fossil fish sheds light on the origin of bony fishes. Nature 397, 607–610 (1999)

    CAS  Article  Google Scholar 

  13. 13

    Basden, A. M. & Young, G. C. A primitive actinopterygian neurocranium from the early Devonian of southeastern Australia. J. Vert. Paleontol. 21, 754–766 (2001)

    Article  Google Scholar 

  14. 14

    Basden, A. M. et al. The most primitive osteichthyan braincase? Nature 403, 185–188 (2000)

    CAS  Article  Google Scholar 

  15. 15

    Chang, M. M. . The Braincase of Youngolepis, a Lower Devonian Crossopterygian from Yunnan, South-western China Thesis, Stockholm Univ. (1982)

    Google Scholar 

  16. 16

    Fox, R. C. et al. A new osteolepiform fish from the Lower Carboniferous Raymond Formation, Drummond Basin, Queensland. Mem. Queensl. Mus. 38, 97–221 (1995)

    Google Scholar 

  17. 17

    Jessen, H. L. Lower Devonian Porolepiformes from the Canadian Arctic with special reference to Powichthys thorsteinssoni Jessen. Palaeontogr. A 167, 180–214 (1980)

    Google Scholar 

  18. 18

    Chang, M. M. & Zhu, M. A new Middle Devonian osteolepidid from Qujing, Yunnan. Mem. Assoc. Australas. Palaeontol. 15, 183–198 (1993)

    Google Scholar 

  19. 19

    Chang, M. M. in Early Vertebrates and Related Problems of Evolutionary Biology (eds Chang, M. M., Liu, Y. H. & Zhang, G. R.) 355–378 (Science, Beijing, 1991)

    Google Scholar 

  20. 20

    Long, J. On the relationships of Psarolepis and the onychodontiform fishes. J. Vert. Paleontol. 21, 815–820 (2001)

    Article  Google Scholar 

  21. 21

    Swofford, D. L. PAUP: Phylogenetic Analysis Using Parsimony ver. 3.1.1 (Illinois Natural History Survey, Champaign, Illinois, 1993)

    Google Scholar 

  22. 22

    Forey, P. L. History of the Coelacanth Fishes (Chapman & Hall, London, 1998)

    Google Scholar 

  23. 23

    Cloutier, R. in Devonian Fishes and Plants of Miguasha, Quebec, Canada (eds Schultze, H.-P. & Cloutier, R.) 227–247 (Pfeil, Munich, 1996)

    Google Scholar 

  24. 24

    Gardiner, B. G. The relationships of the palaeoniscid fishes, a review based on new specimens of Mimia and Moythomasia from the Upper Devonian of Western Australia. Bull. Br. Mus. Nat. Hist. Geol. 37, 173–428 (1984)

    Google Scholar 

  25. 25

    Chang, M. M. Diabolepis and its bearing on the relationships between porolepiforms and dipnoans. Bull. Mus. Natl Hist. Nat. Ser. 4 17, 235–268 (1995)

    Google Scholar 

  26. 26

    Schultze, H.-P. in The Biology and Evolution of Lungfishes (eds Bemis, W. E., Burggren, W. W. & Kemp, N. E.) J. Morph. 1 (Suppl.), 39–74, (1987)

    Google Scholar 

  27. 27

    Ahlberg, P. E. & Johanson, Z. Osteolepiforms and the ancestry of tetrapods. Nature 395, 792–794 (1998)

    Article  Google Scholar 

  28. 28

    Long, J. A new rhizodontiform fish from the Early Carboniferous of Victoria, Australia, with remarks on the phylogenetic position of the group. J. Vert. Paleontol. 9, 1–17 (1989)

    Article  Google Scholar 

  29. 29

    Johanson, Z. & Ahlberg, P. E. A complete primitive rhizodont from Australia. Nature 394, 569–572 (1998)

    CAS  Article  Google Scholar 

  30. 30

    Chang, M. M. & Yu, X. Re-examination of the relationship of Middle Devonian osteolepids—fossil characters and their interpretations. Am. Mus. Novit. 3189, 1–20 (1997)

    Google Scholar 

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Acknowledgements

We thank M. M. Chang and P. E. Ahlberg for advice and discussions, K. S. Thomson for comments and corrections, M. Yang for artwork, J. Zhang for photographic work, and X. Lu for specimen preparation. This work was supported by the Special Funds for Major State Basic Research Projects of China, the Chinese Foundation of Natural Sciences, and the US National Geographic Society. X.Y. thanks Kean University for faculty research and development support.

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Correspondence to Min Zhu.

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Zhu, M., Yu, X. A primitive fish close to the common ancestor of tetrapods and lungfish. Nature 418, 767–770 (2002). https://doi.org/10.1038/nature00871

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