Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/27439
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dc.contributor.authorMitchell, D Rexen
dc.date.accessioned2019-08-13T04:19:43Z-
dc.date.available2019-08-13T04:19:43Z-
dc.date.issued2019-
dc.identifier.urihttps://hdl.handle.net/1959.11/27439-
dc.descriptionThis dataset contains STL files of Simosthenurus occidentalis and Phascolarctos cinereus crania and mandibles for 3D modelling. The related publication, published earlier this year (10.1017/pab.2018.46), examines the skulls of twelve species, including the two species included in this dataset. The models for these same two species in the related study were generated from these same files, but for entirely different hypotheses and tests.en
dc.description.abstractThe Sthenurinae were a diverse subfamily of short-faced kangaroos that arose in the Miocene and diversified during the Pliocene and Pleistocene. Many species possessed skull morphologies that were relatively structurally reinforced with bone, suggesting that they were adapted to incorporate particularly resistant foods into their diets. However, the functional roles of many unique, robust features of the sthenurine cranium are not yet clearly defined. Here, the finite element method is applied to conduct a comprehensive analysis of unilateral biting along the cheek tooth battery of a well-represented sthenurine, Simosthenurus occidentalis. The results are compared with those of an extant species considered to be of most similar ecology and cranial proportions to this species, the koala (Phascolarctos cinereus). The simulations reveal that the cranium of S. occidentalis could produce and withstand comparatively high forces during unilateral biting. Its greatly expanded zygomatic arches potentially housed enlarged zygomaticomandibularis muscles, shown here to reduce the risk of dislocation of the temporomandibular joint during biting with the rear of a broad, extensive cheek tooth row. This may also be a function of the zygomaticomandibularis in the giant panda (Ailuropoda melanoleuca), another species known to exhibit an enlarged zygomatic arch and hypertrophy of this muscle. Furthermore, the expanded frontal plates of the S. occidentalis cranium form broad arches of bone with the braincase and deepened maxillae that each extend from the anterior tooth rows to their opposing jaw joints. These arches are demonstrated here to be a key feature in resisting high torsional forces during unilateral premolar biting on large, resistant food items. This supports the notion that S. occidentalis fed thick, lignified vegetation directly to the cheek teeth in a similar manner to that described for the giant panda when crushing mature bamboo culms.en
dc.format.extent.STLen
dc.languageenen
dc.publisherUniversity of New Englanden
dc.relation.uri10.1017/pab.2018.46en
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.titleThe anatomy of a crushing bite: the specialised cranial mechanics of a giant extinct kangarooen
dc.typeDataseten
dc.identifier.doi10.25952/5d523aaaf02d2en
dcterms.accessRightsOpenen
dc.identifier.projectThe anatomy of a crushing bite: the specialised cranial mechanics of a giant extinct kangarooen
dc.subject.keywordsFinite Element Analysisen
dc.subject.keywordsHerbivoryen
dc.subject.keywordsMarsupialen
dc.subject.keywordsAustraliaen
dc.subject.keywordsCraniumen
dc.subject.keywordsFeeding biomechanicsen
dc.subject.keywordsTorsionen
dc.subject.keywordsZygomaticomandibularisen
dc.subject.keywordsConstrained Lever Modelen
dc.subject.keywordsSthenurinaeen
dc.subject.keywordsSimosthenurus occidentalisen
local.contributor.firstnameD Rexen
local.subject.for2008070702 Veterinary Anatomy and Physiologyen
local.subject.for2008110601 Biomechanicsen
local.subject.for2008060206 Palaeoecologyen
local.subject.seo2008970106 Expanding Knowledge in the Biological Sciencesen
local.dcrelation.contactD Rex Mitchellen
local.dcrelation.custodianD Rex Mitchellen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.emaildmitch46@une.edu.auen
local.output.categoryXen
local.access.restrictedto2019-11-01-
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.publisher.placeArmidale, Australiaen
local.title.subtitlethe specialised cranial mechanics of a giant extinct kangarooen
local.access.fulltextYesen
local.contributor.lastnameMitchellen
dc.identifier.staffune-id:dmitch46en
dc.identifier.studentune-id:dmitch38en
local.profile.orcid0000-0003-1495-4879en
local.profile.roleauthoren
local.identifier.unepublicationidune:1959.11/27439en
dc.identifier.academiclevelAcademicen
local.title.maintitleThe anatomy of a crushing biteen
local.output.categorydescriptionX Dataseten
local.search.authorMitchell, D Rexen
local.dcrelation.custodiandetailsD Rex Mitchellen
local.dcrelation.contactdetailsD Rex Mitchellen
Appears in Collections:Dataset
School of Environmental and Rural Science
Files in This Item:
5 files
File Description SizeFormat 
S_occidentalis_SAMAP16648_cranium.stl
  Restricted Access
Surface mesh of Simosthenurus cranium34.36 MBSTLView/Open    Request a copy
S_occidentalis_SAMAP16669_mandible.stl
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Surface mesh of Simosthenurus mandible7.3 MBSTLView/Open    Request a copy
koala_NR1191_cranium.stl
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Surface mesh of koala cranium36.2 MBSTLView/Open    Request a copy
koala_NR1191_mandible.stl
  Restricted Access
Surface mesh of koala mandible3.88 MBSTLView/Open    Request a copy
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