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The axial skeleton of the Devonian tetrapod Ichthyostega.
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Biology, Department of Physiology and Developmental Biology. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Biology, Department of Physiology and Developmental Biology, Evolutionary Organism Biology. Evolutionär organismbiologi.
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Biology, Department of Physiology and Developmental Biology. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Biology, Department of Physiology and Developmental Biology, Evolutionary Organism Biology.
2005 (English)In: Nature, ISSN 0028-0836, Vol. 437, no 7055, 137-140 p.Article in journal (Refereed) Published
Abstract [en]

Ichthyostega was the first Devonian tetrapod to be subject to a whole-body reconstruction and remains, together with Acanthostega one of only two Devonian tetrapods for which near-complete postcranial material is available. It is thus crucially important for our understanding of the earliest stages of tetrapod evolution and terrestrialization. Based on extensive re-examination of original material, augmented by recently collected specimens, we present a new reconstruction of Ichthyostega that differs substantially from those previously published and reveals hitherto unrecognised regionalization in the vertebral column. Ichthyostega is the earliest vertebrate to show obvious adaptations for non-swimming locomotion. Uniquely among early tetrapods, the presacral vertebral column shows pronounced regionalization of neural arch morphology, suggesting that it was adapted for dorsoventral rather than lateral flexion.

Place, publisher, year, edition, pages
2005. Vol. 437, no 7055, 137-140 p.
Keyword [en]
evolution, palaeontology, vertebrate, tetrapod, Devonian, Ichthyostega
National Category
Microbiology
Identifiers
URN: urn:nbn:se:uu:diva-80501DOI: doi:10.1038/nature03893OAI: oai:DiVA.org:uu-80501DiVA: diva2:108415
Available from: 2006-05-18 Created: 2006-05-18 Last updated: 2011-01-11

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