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Fossil Musculature of the Most Primitive Jawed Vertebrates
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
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2013 (English)In: Science, ISSN 0036-8075, E-ISSN 1095-9203, Vol. 341, no 6142, 160-164 p.Article in journal (Refereed) Published
Abstract [en]

The transition from jawless to jawed vertebrates (gnathostomes) resulted in the reconfiguration of the muscles and skeleton of the head, including the creation of a separate shoulder girdle with distinct neck muscles. We describe here the only known examples of preserved musculature from placoderms (extinct armored fishes), the phylogenetically most basal jawed vertebrates. Placoderms possess a regionalized muscular anatomy that differs radically from the musculature of extant sharks, which is often viewed as primitive for gnathostomes. The placoderm data suggest that neck musculature evolved together with a dermal joint between skull and shoulder girdle, not as part of a broadly flexible neck as in sharks, and that transverse abdominal muscles are an innovation of gnathostomes rather than of tetrapods.

Place, publisher, year, edition, pages
2013. Vol. 341, no 6142, 160-164 p.
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Natural Sciences
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URN: urn:nbn:se:uu:diva-206443DOI: 10.1126/science.1237275ISI: 000321965300039OAI: oai:DiVA.org:uu-206443DiVA: diva2:644927
Available from: 2013-09-02 Created: 2013-08-30 Last updated: 2017-12-06Bibliographically approved

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Sanchez, SophieAhlberg, Per Erik

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