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A Pikaia-like chordate from the Lower Cambrian of China

Abstract

THE earliest evolution of the chordates and their relationships with other deuterostomes remains controversial1–3. Rejuvenation of interest in the areas of molecular phylogeny4 and developmental genetics5–7 has not been matched by new insights from the fossil record, which for the Lower and Middle Cambrian remains exceptionally sparse. The supposed chordate Emmonsaspis8 has been shown to be a frond-like fossil9, and phosphatic sclerites of hadimopanellids, once compared with vertebrate dermal armour10,11, are now known to be derived from the cuticle of protostome palaeoscolecidan worms12,13. Other fragmentary material of supposed scales is even more dubious14. The best-known candidate in this thin roster remains the Burgess Shale chordate Pikaia15. Here we report a single specimen of a Lower Cambrian chordate, Cathaymyrus diadexus, new genus and species, that is similar to Pikaia but predates it by about 10 million years (Myr). Important features of this new specimen are structures interpreted as pharyngeal gill slits. The evolution of chordates was an integral part of the first stages of the Cambrian 'explosion', and steps to craniates with neural crest were probably achieved by the Middle Cambrian.

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References

  1. Bone, Q. J. Linn. Soc. (Zool.) 44, 252–269 (1960).

    Article  Google Scholar 

  2. Jollie, M. Zool. J. Linn. Soc. 75, 167–180 (1982).

    Article  Google Scholar 

  3. Jefferies, R. P. S., Brown, N. A. & Daley, P. E. J. Acta Zool. Stockh. 77, 101–122 (1996).

    Article  Google Scholar 

  4. Wada, H. & Satoh, N. Proc. Natl Acad. Sci. USA 91, 1801–1804 (1994).

    Article  ADS  CAS  Google Scholar 

  5. Satoh, N. & Jeffery, W. R. Trends Genet. 11, 354–359 (1995).

    Article  CAS  Google Scholar 

  6. Holland, P. W. H. & Garcia-Fernandez, J. Dev. Biol. 173, 382–395 (1996).

    Article  CAS  Google Scholar 

  7. Holland, P. W. H., Koschorz, B., Holland, L. Z. & Herrmann, B. G. Development 121, 4283–4291 (1995).

    CAS  PubMed  Google Scholar 

  8. Durham, J. W. Prac. N. Am. Paleont. Conv. H, 1101–1132 (1971).

    Google Scholar 

  9. Conway Morris, S. Palaeontology 36, 593–635 (1993).

    Google Scholar 

  10. van den Boogaard, M. Scr. Geol. 90, 1–12 (1989).

    Google Scholar 

  11. Märss, T. Eesti NSV Tead. Akad. Toim. Geol. 37, 10–17 (1988).

    Google Scholar 

  12. Müller, K. J. & Hinz-Schallreuter, I. Palaeontology 36, 549–592 (1993).

    Google Scholar 

  13. Conway Morris, S. Zool. J. Linn. Soc. (in the press).

  14. Howell, B. F. Bull. Geol. Soc. Am. 48, 1147–1210 (1937).

    Article  Google Scholar 

  15. Conway Morris, S. in Atlas of the Burgess Shale (ed. Conway Morris, S.) 26 (Palaeontological Association, London, 1982).

    Google Scholar 

  16. Chen, J.-Y., Ramsköld, L. & Zhou, G.-Q. Science 264, 1304–1308 (1994).

    Article  ADS  CAS  Google Scholar 

  17. Shu, D., Geyer, G., Chen, L. & Zhang, X.-L. Beringeria (special issue) 2, 203–241 (1995).

    Google Scholar 

  18. Conway Morris, S. Trans. R. Soc. Edinb. Earth Sci. 80, 271–283 (1989).

    Article  Google Scholar 

  19. Briggs, D. E. G. & Kear, A. J. Lethaia 26, 275–287 (1994).

    Article  Google Scholar 

  20. Butterfield, N. J. Lethaia 29, 109–112 (1996).

    Article  Google Scholar 

  21. Conklin, E. G. J. Morph. 54, 69–151 (1932).

    Article  Google Scholar 

  22. Peterson, K. J. Lethaia 28, 25–38 (1995).

    Article  Google Scholar 

  23. Shu, D.-G., Zhang, X.-L. & Chen, L. Nature 380, 428–430 (1996).

    Article  ADS  CAS  Google Scholar 

  24. Chen, J.-Y., Dzik, J., Edgecombe, G. D., Ramsköld, L. & Zhou, G.-Q. Nature 377, 720–722 (1995).

    Article  ADS  CAS  Google Scholar 

  25. Dzik, J. Acta Palaeont. Pol. 40, 341–360 (1995).

    Google Scholar 

  26. Gould, S. J. Nature 377, 681–682 (1995).

    Article  ADS  CAS  Google Scholar 

  27. Zhuravlev, A. Yu. Beringeria (special issue) 2, 147–160 (1995).

    Google Scholar 

  28. Sansom, I. J., Smith, M. P., Armstrong, H. A. & Smith, M. M. Science 256, 1308–1311 (1992).

    Article  ADS  CAS  Google Scholar 

  29. Gabbott, S. E., Aldridge, R. J. & Theron, J. N. Nature 374, 800–803 (1995).

    Article  ADS  CAS  Google Scholar 

  30. Szaniawski, H. & Bengtson, S. J. Paleont. 67, 640–654 (1993).

    Article  Google Scholar 

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Shu, DG., Morris, S. & Zhang, XL. A Pikaia-like chordate from the Lower Cambrian of China. Nature 384, 157–158 (1996). https://doi.org/10.1038/384157a0

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