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dc.contributor.authorClack, Jenniferen
dc.contributor.authorPorro, LBen
dc.contributor.authorBennett, CEen
dc.date.accessioned2017-05-03T15:02:47Z
dc.date.available2017-05-03T15:02:47Z
dc.identifier.issn1755-6910
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/264005
dc.description.abstractThe early tetrapod $\textit{Crassigyrinus scoticus}$ was a large aquatic predator from the mid Carboniferous (late Viséan or early Serpukovian) of Scotland, around 330 MY in age. There are five main specimens with cranial remains: an articulated skeleton; two incomplete skulls; and two lower jaws. $\textit{Crassigyrinus}$ retains several apparently primitive features of the palatal dentition and lower jaw, and its phylogenetic position is disputed. A partial lower jaw resembling that of $\textit{Crassigyrinus}$ was discovered at Burnmouth in the Borders Region of Scotland. The horizon in which it was found is dated as late Tournaisian, CM palynozone, around 350 MY in age. Though it lacks dentition, the jaw preserves much of the postsplenial, angular and surangular, whose appearance externally and internally is almost identical to that of $\textit{C. scoticus}$. Internally the jaw shows a similarly limited extent of the suturing between the splenial series and the prearticular, a primitive condition. Externally, the type and distribution of dermal ornamentation closely matches that of $\textit{C. scoticus}$, as does the deeply excavated and marginally positioned lateral line groove. As well as external and internal features, all specimens of $\textit{C. scoticus}$ are of similar skull size, though the Burnmouth jaw is somewhat smaller. If correctly attributable to $\textit{Crassigyrinus}$, this specimen extends the existence of the genus by approximately 20 million years towards the base of the Carboniferous.
dc.description.sponsorshipLBP was funded by a Marie Curie International Incoming Research Fellowship (“Tetrapods Rising”, 300161), and for JAC and CEB by NERC consortium grants NE/J022713/1 and NE/J020729/1 known as the TW:eed project. This is a contribution to IGCP project 596.
dc.languageEnglishen
dc.language.isoenen
dc.publisherCambridge University Press
dc.subjectBurnmouthen
dc.subjectBorders Regionen
dc.subjecttetrapoden
dc.subjectTW:eed projecten
dc.subjectRomer’s Gapen
dc.titleA Crassigyrinus-like jaw from the Tournaisian (Early Mississippian) of Scotlanden
dc.typeArticle
prism.publicationNameEarth and Environmental Science Transactions of the Royal Society of Edinburghen
dc.identifier.doi10.17863/CAM.9366
dcterms.dateAccepted2017-02-15en
rioxxterms.versionAMen
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2017-02-15en
dc.contributor.orcidClack, Jennifer [0000-0003-0017-5831]
dc.identifier.eissn1755-6929
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idNERC (NE/J022713/1)


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