The characters of Palaeozoic jawed vertebrates

Zoological Journal of the Linnean Society
Martin D Brazeau, Matt Friedman

Abstract

Newly discovered fossils from the Silurian and Devonian periods are beginning to challenge embedded perceptions about the origin and early diversification of jawed vertebrates (gnathostomes). Nevertheless, an explicit cladistic framework for the relationships of these fossils relative to the principal crown lineages of the jawed vertebrates (osteichthyans: bony fishes and tetrapods; chondrichthyans: sharks, batoids, and chimaeras) remains elusive. We critically review the systematics and character distributions of early gnathostomes and provide a clearly stated hierarchy of synapomorphies covering the jaw-bearing stem gnathostomes and osteichthyan and chondrichthyan stem groups. We show that character lists, designed to support the monophyly of putative groups, tend to overstate their strength and lack cladistic corroboration. By contrast, synapomorphic hierarchies are more open to refutation and must explicitly confront conflicting evidence. Our proposed synapomorphy scheme is used to evaluate the status of the problematic fossil groups Acanthodii and Placodermi, and suggest profitable avenues for future research. We interpret placoderms as a paraphyletic array of stem-group gnathostomes, and suggest what we regard as two equa...Continue Reading

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Citations

Dec 18, 2015·Proceedings. Biological Sciences·Martin D Brazeau, Valerie de Winter
Apr 23, 2015·Biological Reviews of the Cambridge Philosophical Society·Tetsuto Miyashita
May 5, 2016·Journal of Morphology·Nicholas A EllisCraig T Miller
Jan 5, 2018·Proceedings. Biological Sciences·Michael I CoatesPatrick J La Riviere
Apr 24, 2015·Nature·Martin D Brazeau, Matt Friedman
Jul 4, 2020·Integrative and Comparative Biology·Zerina JohansonMoya Smith
May 13, 2020·Developmental Dynamics : an Official Publication of the American Association of Anatomists·Rui Diogo
Mar 30, 2019·Biological Reviews of the Cambridge Philosophical Society·Donald DavesneRoger B J Benson
Sep 9, 2020·Nature Ecology & Evolution·Martin D BrazeauMarco Castiello
Aug 10, 2017·Royal Society Open Science·Zerina JohansonCathrin Pfaff
Jan 21, 2021·Proceedings. Biological Sciences·Humberto G FerrónPhilip C J Donoghue
Apr 4, 2018·Current Biology : CB·Krister T SmithJörg Habersetzer
May 8, 2021·Nature Ecology & Evolution·Martin RücklinPhilip C J Donoghue

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