A 350-million-year-old fossil provides evidence of an almost unknown stage in the origin of land vertebrates. It is also a reminder of how little is known of the relationships between the main lineages of amphibians and reptiles.
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Carroll, R. Early land vertebrates. Nature 418, 35–36 (2002). https://doi.org/10.1038/418035a
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DOI: https://doi.org/10.1038/418035a
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