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Galeaspid anatomy and the origin of vertebrate paired appendages - Nature

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Galeaspid anatomy and the origin of vertebrate paired appendages - Nature

Paired fins are a major innovation1,2 that evolved in the jawed vertebrate lineage after divergence from living jawless vertebrates3. Extinct jawless armoured stem gnathostomes show a diversity of paired body-wall extensions, ranging from skeletal processes to simple flaps4. By contrast, osteostracans (a sister group to jawed vertebrates) are interpreted to have the first true paired appendages in a pectoral position, with pelvic appendages evolving later in association with jaws5.

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Galeaspid anatomy and the origin of vertebrate paired appendages - Nature

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Galeaspid anatomy and the origin of vertebrate paired appendages - Nature

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