Tetrapod trackways from the early Middle Devonian period of Poland

  title={Tetrapod trackways from the early Middle Devonian period of Poland},
  author={Grzegorz Niedźwiedzki and Piotr Szrek and K. Narkiewicz and Marek Narkiewicz and Per Erik Ahlberg},
The fossil record of the earliest tetrapods (vertebrates with limbs rather than paired fins) consists of body fossils and trackways. The earliest body fossils of tetrapods date to the Late Devonian period (late Frasnian stage) and are preceded by transitional elpistostegids such as Panderichthys and Tiktaalik that still have paired fins. Claims of tetrapod trackways predating these body fossils have remained controversial with regard to both age and the identity of the track makers. Here we… 
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Follow the footprints and mind the gaps: a new look at the origin of tetrapods
  • P. Ahlberg
  • Geography, Environmental Science
    Earth and Environmental Science Transactions of the Royal Society of Edinburgh
  • 2018
ABSTRACT The hypothesis that tetrapods evolved from elpistostegids during the Frasnian, in a predominantly aquatic context, has been challenged by the discovery of Middle Devonian tetrapod trackways
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  • P. Ahlberg
  • Geography, Environmental Science
  • 1991
SINCE 1932, the earliest known undisputed tetrapods have been of uppermost Famennian (late Upper Devonian) age1–3. Although a probable tetrapod jaw has been described from the Lower Famennian4, and
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Trackways of Tetrapod Vertebrates from the Upper Devonian of Victoria, Australia
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The morphology of the specimens suggests that limbs with digits may have been adaptations to an aquatic rather than a terrestrial environment, and challenges pentadactyly as primitive for tetrapods.