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Zheng et al. reply

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Abstract

REPLYING TO G. Mayr & A. Manegold Nature 499, 10.1038/nature12367 (2013)

Our explanation that structures preserved in three Early Cretaceous Jehol birds1 are ovarian follicles is challenged by Mayr & Manegold2. We believe that their conclusions are speculative and do not take into account our original arguments. Contrary to Mayr & Manegold2, unambiguous evidence for the preservation of less resistant tissue, such as muscles or internal organs, are not scarce among Jehol fossils (for example, fish, lampreys)3 and eggs are sometimes preserved in specimens of the sturgeon Peipiaosteus (J.-Y. Zhang, personal communication). Although we cannot explain the vagaries of taphonomy that lead to the preservation of ovarian follicles in these specimens, what is clear is that exceptional preservation of soft tissue is dictated by the unique chemical microenvironment created by the individual decaying tissues, and thus varied degrees of preservation within a single specimen is expected4. Exceptional Jehol fossils are a reminder that simply because something is unlikely to preserve does not mean that it will not.

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References

  1. Zheng, X. et al. Preservation of ovarian follicles reveals early evolution of avian reproductive behaviour. Nature 495, 507–511 (2013)

    ADS  CAS  Article  Google Scholar 

  2. Mayr, G. & Manegold, A. Can ovarian follicles fossilize? Nature 499, http://dx.doi.org/10.1038/nature12367 (2013)

  3. Zhou, Z. & Wang, Y. Vertebrate diversity of the Jehol Biota as compared with other lagerstätten. Sci. China Earth Sci. 53, 1894–1907 (2010)

    Article  Google Scholar 

  4. Briggs, D. E. G., Wilby, P. R., Pérez-Moreno, B., Sanz, J. L. & Frenegal-Martinez, M. The mineralization of dinosaur soft tissue in the Lower Cretaceous of Las Hoyas, Spain. J. Geol. Soc. 154, 587–588 (1997)

    ADS  Article  Google Scholar 

  5. Griffiths, P. J. in 1r Congrés Internacional sobre Ous i Cries de Dinosaures, Extended Abstracts (eds Bravo, A. M. & Reyes, T. ) 77–83 (Isona i Conca Dellà, 1999)

    Google Scholar 

  6. Chen, P.-J., Dong, Z. & Zhen, S. An exceptionally well-preserved theropod dinosaur from the Yixian Formation of China. Nature 391, 147–152 (1998)

    ADS  CAS  Article  Google Scholar 

  7. Weiner, S., Lowenstam, H. A. & Hood, L. Characterization of 80-million-year-old mollusk shell proteins. Proc. Natl Acad. Sci. USA 73, 2541–2545 (1976)

    ADS  CAS  Article  Google Scholar 

  8. Minnaar, P. & Minnaar, M. The Emu Farmer’s Handbook (Iduna Company, 1994)

    Google Scholar 

  9. Gill, F. B. Ornithology 3rd edn (W.H. Freeman and Company, 2007)

    Google Scholar 

  10. Zheng, X. et al. Fossil evidence of avian crops from the Early Cretaceous of China. Proc. Natl Acad. Sci. USA 108, 15904–15907 (2011)

    ADS  CAS  Article  Google Scholar 

  11. Thorbjarnarson, J. B. Reproductive characteristics of the order Crocodylia. Herpetologica 52, 8–24 (1996)

    Google Scholar 

  12. Chinsamy, A., Chiappe, L. M. & Dodson, P. Mesozoic avian bone microstructure: physiological implications. Paleobiology 21, 561–574 (1995)

    Article  Google Scholar 

  13. Dyke, G. D. & Kaiser, G. In Proceedings of the VII International Meeting of the Society of Avian Paleontology and Evolution Vol. 62 (eds Boles, W. E. & Worthy, T. H. ) 207–216 (Records of the Australian Museum, 2010)

    Google Scholar 

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J.O., Z.Z. and X.Z. designed the research. J.O. and Z.Z. wrote the reply.

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Correspondence to Jingmai O’Connor.

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O’Connor, J., Zheng, X. & Zhou, Z. Zheng et al. reply. Nature 499, E1–E2 (2013). https://doi.org/10.1038/nature12368

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