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A three‐dimensional placoderm (stem‐group gnathostome) pharyngeal skeleton and its implications for primitive gnathostome pharyngeal architecture
dc.contributor.authorBrazeau, Martin D.
dc.contributor.authorFriedman, Matt
dc.contributor.authorJerve, Anna
dc.contributor.authorAtwood, Robert C.
dc.date.accessioned2017-10-05T18:16:21Z
dc.date.available2018-12-03T15:34:02Zen
dc.date.issued2017-09
dc.identifier.citationBrazeau, Martin D.; Friedman, Matt; Jerve, Anna; Atwood, Robert C. (2017). "A three‐dimensional placoderm (stem‐group gnathostome) pharyngeal skeleton and its implications for primitive gnathostome pharyngeal architecture." Journal of Morphology 278(9): 1220-1228.
dc.identifier.issn0362-2525
dc.identifier.issn1097-4687
dc.identifier.urihttps://hdl.handle.net/2027.42/138208
dc.description.abstractThe pharyngeal skeleton is a key vertebrate anatomical system in debates on the origin of jaws and gnathostome (jawed vertebrate) feeding. Furthermore, it offers considerable potential as a source of phylogenetic data. Well‐preserved examples of pharyngeal skeletons from stem‐group gnathostomes remain poorly known. Here, we describe an articulated, nearly complete pharyngeal skeleton in an Early Devonian placoderm fish, Paraplesiobatis heinrichsi Broili, from Hunsrück Slate of Germany. Using synchrotron light tomography, we resolve and reconstruct the three‐dimensional gill arch architecture of Paraplesiobatis and compare it with other gnathostomes. The preserved pharyngeal skeleton comprises elements of the hyoid arch (probable ceratohyal) and a series of branchial arches. Limited resolution in the tomography scan causes some uncertainty in interpreting the exact number of arches preserved. However, at least four branchial arches are present. The final and penultimate arches are connected as in osteichthyans. A single median basihyal is present as in chondrichthyans. No dorsal (epibranchial or pharyngobranchial) elements are observed. The structure of the pharyngeal skeleton of Paraplesiobatis agrees well with Pseudopetalichthys from the same deposit, allowing an alternative interpretation of the latter taxon. The phylogenetic significance of Paraplesiobatis is considered. A median basihyal is likely an ancestral gnathostome character, probably with some connection to both the hyoid and the first branchial arch pair. Unpaired basibranchial bones may be independently derived in chondrichthyans and osteichthyans.A three‐dimensional articulated gill arch skeleton of a 400‐million‐year‐old placoderm fish is described. This adds to the diversity of feeding and respiratory structures in jawed vertebrate animals and informing hypotheses of gill arch evolution in the first jawed vertebrates.
dc.publisherCambridge University Press
dc.publisherWiley Periodicals, Inc.
dc.subject.otherHunsrück Slate
dc.subject.othersynchrotron tomography
dc.subject.otherbranchial skeleton
dc.subject.otherParaplesiobatis
dc.subject.otherhyoid arch
dc.subject.otherDevonian
dc.titleA three‐dimensional placoderm (stem‐group gnathostome) pharyngeal skeleton and its implications for primitive gnathostome pharyngeal architecture
dc.typeArticleen_US
dc.rights.robotsIndexNoFollow
dc.subject.hlbsecondlevelMolecular, Cellular and Developmental Biology
dc.subject.hlbtoplevelScience
dc.subject.hlbtoplevelHealth Sciences
dc.description.peerreviewedPeer Reviewed
dc.description.bitstreamurlhttps://deepblue.lib.umich.edu/bitstream/2027.42/138208/1/jmor20706_am.pdf
dc.description.bitstreamurlhttps://deepblue.lib.umich.edu/bitstream/2027.42/138208/2/jmor20706.pdf
dc.identifier.doi10.1002/jmor.20706
dc.identifier.sourceJournal of Morphology
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dc.owningcollnameInterdisciplinary and Peer-Reviewed


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