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The mandible and dentition of the Early Cretaceous monotreme Teinolophos trusleri

Rich, Thomas H.; Hopson, James A.; Gill, Pamela G.; Trusler, Peter; Rogers-Davidson, Sally; Morton, Steve; Cifelli, Richard L.; Pickering, David; Kool, Lesley; Siu, Karen; Burgmann, Flame A.; Senden, Tim; Evans, Alistair R.; Wagstaff, Barbara E.; Seegets-Villiers, Doris; Corfe, Ian J.; Flannery, Timothy F.; Walker, Ken; Musser, Anne M.; Archer, Michael; Pian, Rebecca; Vickers-Rich, Patricia

Description

The monotreme Teinolophos trusleri Rich, Vickers-Rich, Constantine, Flannery, Kool & van Klaveren, 1999 from the Early Cretaceous of Australia is redescribed and reinterpreted here in light of additional specimens of that species and compared with the exquisitely preserved Early Cretaceous mammals from Liaoning Province, China. Together, this material indicates that although T. trusleri lacked a rod of postdentary bones contacting the dentary, as occurs in non-mammalian cynodonts and basal...[Show more]

dc.contributor.authorRich, Thomas H.
dc.contributor.authorHopson, James A.
dc.contributor.authorGill, Pamela G.
dc.contributor.authorTrusler, Peter
dc.contributor.authorRogers-Davidson, Sally
dc.contributor.authorMorton, Steve
dc.contributor.authorCifelli, Richard L.
dc.contributor.authorPickering, David
dc.contributor.authorKool, Lesley
dc.contributor.authorSiu, Karen
dc.contributor.authorBurgmann, Flame A.
dc.contributor.authorSenden, Tim
dc.contributor.authorEvans, Alistair R.
dc.contributor.authorWagstaff, Barbara E.
dc.contributor.authorSeegets-Villiers, Doris
dc.contributor.authorCorfe, Ian J.
dc.contributor.authorFlannery, Timothy F.
dc.contributor.authorWalker, Ken
dc.contributor.authorMusser, Anne M.
dc.contributor.authorArcher, Michael
dc.contributor.authorPian, Rebecca
dc.contributor.authorVickers-Rich, Patricia
dc.date.accessioned2017-02-01T00:00:51Z
dc.date.available2017-02-01T00:00:51Z
dc.identifier.issn0311-5518
dc.identifier.urihttp://hdl.handle.net/1885/112071
dc.description.abstractThe monotreme Teinolophos trusleri Rich, Vickers-Rich, Constantine, Flannery, Kool & van Klaveren, 1999 from the Early Cretaceous of Australia is redescribed and reinterpreted here in light of additional specimens of that species and compared with the exquisitely preserved Early Cretaceous mammals from Liaoning Province, China. Together, this material indicates that although T. trusleri lacked a rod of postdentary bones contacting the dentary, as occurs in non-mammalian cynodonts and basal mammaliaforms, it did not share the condition present in all living mammals, including monotremes, of having the three auditory ossicles, which directly connect the tympanic membrane to the fenestra ovalis, being freely suspended within the middle ear cavity. Rather, T. trusleri appears to have had an intermediate condition, present in some Early Cretaceous mammals from Liaoning, in which the postdentary bones cum ear ossicles retained a connection to a persisting Meckel’s cartilage although not to the dentary. Teinolophos thus indicates that the condition of freely suspended auditory ossicles was acquired independently in monotremes and therian mammals. Much of the anterior region of the lower jaw of Teinolophos is now known, along with an isolated upper ultimate premolar. The previously unknown anterior region of the jaw is elongated and delicate as in extant monotremes, but differs in having at least seven antemolar teeth, which are separated by distinct diastemata. The dental formula of the lower jaw of Teinolophos trusleri as now known is i2 c1 p4 m5. Both the deep lower jaw and the long-rooted upper premolar indicate that Teinolophos, unlike undoubted ornithorhynchids (including the extinct Obdurodon), lacked a bill.
dc.description.sponsorshipThe Committee for Research and Exploration of the National Geographic Society and the Australian Research Council provided much of the funding needed for the fieldwork carried out at the Flat Rocks locality. We acknowledge travel funding provided by the International Synchrotron Access Program managed by the Australian Synchrotron and funded by the Australian Government.
dc.format28 pages
dc.format.mimetypeapplication/pdf
dc.publisherTaylor & Francis
dc.rights© 2016 Australasian Palaeontologists
dc.sourceAlcheringa: An Australasian Journal of Palaeontology
dc.subjectMonotremata
dc.subjectTeinolophos
dc.subjectTMME
dc.subjectCretaceous
dc.subjectAustralia
dc.subjectdentition
dc.subjectmandible
dc.titleThe mandible and dentition of the Early Cretaceous monotreme Teinolophos trusleri
dc.typeJournal article
local.description.notesThis paper is warmly dedicated to the memory of Zofia Kielan-Jaworowska, one of the foremost pioneers and all-time authorities on Mesozoic mammals.
local.identifier.citationvolume40
dcterms.dateAccepted2016-04-14
dc.date.issued2016
local.publisher.urlhttp://taylorandfrancis.com/
local.type.statusPublished Version
local.contributor.affiliationSenden, Tim J., Department of Applied Mathematics, CPMS Research School of Physics and Engineering, The Australian National University
local.identifier.essn1752-0754
local.bibliographicCitation.issue4
local.bibliographicCitation.startpage475
local.bibliographicCitation.lastpage501
local.identifier.doi10.1080/03115518.2016.1180034
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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