Abstract
Living gnathostomes (jawed vertebrates) include chondrichthyans (sharks, rays and chimaeras) and osteichthyans or bony fishes. Living osteichthyans are divided into two lineages, namely actinopterygians (bichirs, sturgeons, gars, bowfins and teleosts) and sarcopterygians (coelacanths, lungfishes and tetrapods). It remains unclear how the two osteichthyan lineages acquired their respective characters and how their common osteichthyan ancestor arose from non-osteichthyan gnathostome groups1, 2. Here we present the first tentative reconstruction of a 400-million-year-old fossil fish from China (Fig. 1); this fossil fish combines features of sarcopterygians and actinopterygians and yet possesses large, paired fin spines previously found only in two extinct gnathostome groups (placoderms and acanthodians). This early bony fish provides a morphological link between osteichthyans and non-osteichthyan groups. It changes the polarity of many characters used at present in reconstructing osteichthyan inter-relationships and offers new insights into the origin and evolution of osteichthyans.
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Acknowledgements
We thank H.-P. Schultze, M. M. Chang and P. E. Ahlberg for useful discussons; W.Harre for the photographs and P. E. Ahlberg, M. I. Coates and M. M. Smith for comments and suggestions. M.Z. acknowledges support from the Alexander von Humboldt Foundation and the Chinese academy of Sciences. X.Y. thanks IVPP for access to specimens and Kean University for support for research and faculty development.
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Zhu, M., Yu, X. & Janvier, P. A primitive fossil fish sheds light on the origin of bony fishes. Nature 397, 607–610 (1999). https://doi.org/10.1038/17594
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DOI: https://doi.org/10.1038/17594
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