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The most primitive osteichthyan braincase?

Nature volume 403, pages 185188 (13 January 2000) | Download Citation

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Abstract

Most living vertebrates, from teleosts to tetrapods, are osteichthyans (bony fishes)1, but the origin of this major group is poorly understood2. The actinopterygians (ray-finned bony fishes) are the most successful living vertebrates in terms of diversity. They appear in the fossil record in the Late Silurian but are poorly known before the Late Devonian. Here we report the discovery of the oldest and most primitive actinopterygian-like osteichthyan braincase known, from 400–million-year-old limestone in southeastern Australia. This specimen displays previously unknown primitive conditions, in particular, an opening for a cartilaginous eyestalk. It provides an important and unique counterpart to the similarly aged and recently described Psarolepis from China and Vietnam3,4. The contrasting features of these specimens, and the unusual anatomy of the new specimen in particular, provide new insights into anatomical conditions close to the evolutionary radiation of all modern osteichthyan groups.

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References

  1. 1.

    Early Vertebrates. Oxford Monographs on Geology and Geophysics Vol. 33 (Oxford Univ. Press, Oxford, 1996).

  2. 2.

    Something fishy in the family tree. Nature 397, 564–565 (1999).

  3. 3.

    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).

  4. 4.

    & A primitive fossil fish sheds light on the origin of bony fishes. Nature 397, 607–610 ( 1999).

  5. 5.

    , , , & Siluro–Devonian microvertebrates from southeastern Australia. Cour. Forsch. Senck. (in the press).

  6. 6.

    The braincase of pholidophorid and leptolepid fishes, with a review of the actinopterygian braincase. Phil. Trans. R. Soc. Lond. B 269, 275–579 (1975).

  7. 7.

    & in Problems in Vertebrate Evolution (eds Andrews, S. M., Miles, R. S. & Walker, A. D.) 227– 245 (Academic, London, 1977).

  8. 8.

    Palaeoniscoidea-Schuppen aus dem Unterdevon Australiens and Kanadas und aus dem Mittledevon Spitsbergens. Bull. Brit. Mus. Nat. Hist. (Geol) 16, 343–368 ( 1968).

  9. 9.

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

  10. 10.

    New information on the structure and relationships of Buchanosteus (Placodermi: Euarthrodira) from the Early Devonian of New South Wales. Zool. Jour. Linn. Soc. 66, 307–352 (1979).

  11. 11.

    A new early Devonian placoderm from New south Wales, Australia, with a discussion of placoderm phylogeny. Palaeontographica 167A, 10–76 (1980).

  12. 12.

    The relationships of placoderm fishes. Zool. Jour. Linn. Soc. 88, 1–57 (1986).

  13. 13.

    Placoderm interrelationships: a new interpretation, with a short review of placoderm classification. Proc. Linn. Soc. NSW 107, 211–243 (1984).

  14. 14.

    Les affinités des Placoderms, une revue des hypothèses actuelles. Géobios, Mém. Spéc. 6, 27–38 (1982).

  15. 15.

    The relationships of placoderms. J. Vert. Paleont. 4, 379–395 (1984).

  16. 16.

    Das Kopfskelett von Cladodus wildungensis Jaekel. Senckenbergiana 19, 80–107 ( 1937).

  17. 17.

    & A palaeonisciform braincase from the Permian of Texas, with comments on cranial fissures and the posterior myodome. Am. Mus. Novit. 2658, 1– 15 (1937).

  18. 18.

    The Development of the Vertebrate Skull (Oxford Univ. Press, Oxford, 1937).

  19. 19.

    & The braincase of a primitive shark. Trans. R. Soc. Edinb., Earth Sci. 89, 63–85 (1998).

  20. 20.

    in Interrelationships of Fishes (eds Greenwood, P. H., Miles, R. S. & Patterson, C.) Zool. J. Linn. Soc. 53 (suppl. 1), 63–103 (1973).

  21. 21.

    The braincase of Youngolepis, a Lower Devonian crossopterygian from Yunnan, south-western China. Thesis, Univ. Stockholm ( 1982).

  22. 22.

    PAUP: phylogenetic analysis using parsimony, version 3.1.1. (Illinois Natural History Survey, Champaigne, Illinois, 1993).

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Acknowledgements

We thank D. Goujet and C. Poplin for helpful discussion. A.B. thanks the Australian Museum for use of facilities, and acknowledges support from an Australian Postgraduate Award and Macquarie University Postgraduate Fund. M.I.C. acknowledges support from the Biotechnology and Biological Sciences Research Council UK.

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Affiliations

  1. *Centre for Ecostratigraphy and Palaeobiology, Department of Earth and Planetary Sciences, Macquarie University, New South Wales 2109, Australia

    • Alison M. Basden
  2. †Department of Geology, Australian National University, Canberra 0200, Australia

    • Gavin C. Young
  3. ‡Department of Biological Sciences, University College London, Gower Street, London WC1E 6BT, UK

    • Michael I. Coates
  4. §Australian Museum, College St., Sydney South, New South Wales 2000, Australia

    • Alex Ritchie

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Correspondence to Alison M. Basden.

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https://doi.org/10.1038/35003183

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