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Development of the posterior endocranium of the Devonian dipnoan Griphognathus whitei

Campbell, Kenton; Barwick, Richard; Senden, Timothy

Description

A broad phylogenetic analysis of extant and fossil fishes led previous authors to conclude that the occipital region of primitive actinopterygians was formed by the fusion of three segments. They included the dipnoan Griphognathus whitei from the Devonian of Western Australia in their study and assumed that all sarcopterygians also had the occipital ring made of three segments. In reaching this conclusion, they interpreted the foramina in the walls of the occipital rings in that species as...[Show more]

dc.contributor.authorCampbell, Kenton
dc.contributor.authorBarwick, Richard
dc.contributor.authorSenden, Timothy
dc.date.accessioned2015-12-10T23:08:05Z
dc.identifier.issn0272-4634
dc.identifier.urihttp://hdl.handle.net/1885/63139
dc.description.abstractA broad phylogenetic analysis of extant and fossil fishes led previous authors to conclude that the occipital region of primitive actinopterygians was formed by the fusion of three segments. They included the dipnoan Griphognathus whitei from the Devonian of Western Australia in their study and assumed that all sarcopterygians also had the occipital ring made of three segments. In reaching this conclusion, they interpreted the foramina in the walls of the occipital rings in that species as carrying the spino-occipital nerves, and the furrows in the wall as being for myocommata. We now have access to three small juveniles of this species with the occipital rings isolated from the cranium, and three other young adults smaller than those described previously. There is no evidence of three occipital segments in any of these specimens. The isolated occipital rings have been examined by serial tomography and they have a single spino-occipital nerve that divides into dorsal and ventral branches. The attachment of the occipital segment to the cranium is described for the first time. The structure of the hyomandibula is described from a growth series, and its pattern is different from that of other sarcopterygians. The assumption that the occipital region in dipnoans is representative for all sarcopterygian fishes is shown to be incorrect.
dc.publisherSociety of Vertebrate Palaeontology
dc.sourceJournal of Vertebrate Paleontology
dc.subjectKeywords: adult; cranium; Devonian; fish; fossil; genetic analysis; growth; juvenile; phylogenetics; Australia; Western Australia; Dipnoi; Pisces
dc.titleDevelopment of the posterior endocranium of the Devonian dipnoan Griphognathus whitei
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume32
dc.date.issued2012
local.identifier.absfor040308 - Palaeontology (incl. Palynology)
local.identifier.absfor060206 - Palaeoecology
local.identifier.absfor060305 - Evolution of Developmental Systems
local.identifier.ariespublicationf5625xPUB774
local.type.statusPublished Version
local.contributor.affiliationCampbell, Kenton, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationBarwick, Richard, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationSenden, Timothy , College of Physical and Mathematical Sciences, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.issue4
local.bibliographicCitation.startpage781
local.bibliographicCitation.lastpage798
local.identifier.doi10.1080/02724634.2012.679588
dc.date.updated2016-02-24T09:36:52Z
local.identifier.scopusID2-s2.0-84863572856
local.identifier.thomsonID000305761400003
CollectionsANU Research Publications

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