Motor Control of Masticatory Movements in the Southern Hairy-Nosed Wombat (Lasiorhinus latifrons)

Crompton, A. W.; Lieberman, Daniel E.; Owerkowicz, Tomasz; Baudinette, R. V.; Skinner, Jayne

doi:10.1007/978-0-387-76585-3_5

Cited by 24 publications

(47 citation statements)

References 29 publications

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“…The terminology used here was selected for its consistency with jaw muscle nomenclature used for marsupials (Abbie, 1939; Crompton et al, 2008; Davison & Young, 1990; Murray, 1998; Tomo et al, 2007; Turnbull, 1970; Warburton, 2009). The masseter muscle group includes three portions (superficial, deep and zygomaticomandibularis) based on their area of origin.…”

Section: Methodsmentioning

confidence: 99%

Three dimensional digital reconstruction of the jaw adductor musculature of the extinct marsupial giantDiprotodon optatum

Sharp

2014

PeerJ

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The morphology and arrangement of the jaw adductor muscles in vertebrates reflects masticatory style and feeding processes, diet and ecology. However, gross muscle anatomy is rarely preserved in fossils and is, therefore, heavily dependent on reconstructions. An undeformed skull of the extinct marsupial, Diprotodon optatum, recovered from Pleistocene sediments at Bacchus Marsh in Victoria, represents the most complete and best preserved specimen of the species offering a unique opportunity to investigate functional anatomy. Computed tomography (CT) scans and digital reconstructions make it possible to visualise internal cranial anatomy and predict location and morphology of soft tissues, including muscles. This study resulted in a 3D digital reconstruction of the jaw adductor musculature of Diprotodon, revealing that the arrangement of muscles is similar to that of kangaroos and that the muscle actions were predominantly vertical. 3D digital muscle reconstructions provide considerable advantages over 2D reconstructions for the visualisation of the spatial arrangement of the individual muscles and the measurement of muscle properties (length, force vectors and volume). Such digital models can further be used to estimate muscle loads and attachment sites for biomechanical analyses.

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Section: Methodsmentioning

confidence: 99%

Three dimensional digital reconstruction of the jaw adductor musculature of the extinct marsupial giantDiprotodon optatum

Sharp

2014

PeerJ

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“…Jaw movement during the power stroke in mastication is wholly transverse in V. ursinus and L. latifrons (Ferreira et al, 1989;Murray, 1998;Crompton et al, 2008b), and this was probably also the case in Ramsayia, Phascolonus and "Phascolomys" due to the similarity in molar morphology between these taxa and extant wombats. The lower molars on the working side of the jaw move medially and slightly anteriorly across the upper molars in a single movement.…”

Section: Mastication In Wombatsmentioning

confidence: 97%

New genus of primitive wombat (Vombatidae, Marsupialia) from Miocene deposits in the Riversleigh World Heritage Area (Queensland, Australia)

Brewer

Archer

Hand

et al. 2015

Palaeontologia Electronica

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Brewer, Philippa, Archer, Michael, Hand, Suzanne J., and Abel, Richard. 2015 A new genus of primitive wombat, described here, is the most complete early wombat found. Two partial maxillae, as well as isolated teeth, were found within the Riversleigh World Heritage Area in northwestern Queensland, Australia. Previous to this, only a single species of wombat (Rhizophascolonus crowcrofti) was known from deposits older than 10 Ma, despite an estimated divergence date of 40 Ma between wombats and their closest living relative, the koala. We performed a phylogenetic analysis incorporating the new taxon and using dental, cranial and postcranial characters as well as multiple outgroups in order to control for the diverse specialisations of closely related families and the continuing problem of recognising homologies within these groups. The results indicate a sister relationship between the new taxon and R. crowcrofti relative to all other wombats. Based on detailed comparisons between the cheek teeth of wombats, we propose a model which explains the observed differences in cheek tooth form and function in this group. If this model is correct, it could be used to map morphology against diet, and potentially climate.Brewer, Philippa. Department of Earth Sciences, Natural History Museum, London SW7 5BD. p.brewer@nhm.ac.uk Archer, Michael.

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“…Accompanying the extensive diversity of diets in marsupials is a wide array of molar morphologies. Marsupial molars range from primitively tribosphenic in many microbiotheres, didelphimorphs, and dasyuromorphs to fourcusped bunodont, lophodont, or selenodont in many diprotodonts to variations on these themes in paucituberculatans and peramelemorphs (Dederer 1909;Archer 1976Archer , 1984Reig et al 1987;Sanson 1989;Tyndale-Biscoe 2005;Crompton et al 2008b). Yet despite this overall diversity, marsupials remain sufficiently similar to permit comparison, and the clade as a whole remains small enough that much of the diversity can be incorporated into a comparative study of this nature.…”

Section: Introductionmentioning

confidence: 94%

Molar crests and body mass as dietary indicators in marsupials

Hogue

ZiaShakeri

2010

Aust. J. Zool.

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The discovery of ecomorphological relationships in mammals is important not only in its own right, but also for its potential in shedding light on the ecology of extinct and poorly known species. Two such potential relationships are the proposed connection between molar shear crests and body mass to diet. Research on primates suggests that, owing to the digestive challenges of structural carbohydrates (in foliage and insects), folivores and insectivores differ from other species in needing relatively long molar shear crests. These studies also suggest that metabolic constraints force folivores to be consistently larger than insectivores, with 500-700 g being the proposed body mass boundary between the two. This study tests these proposed ecomorphological links in a diverse sample of 64 marsupial species. As predicted, folivores and insectivores have significantly relatively longer molar shear crests than other species. Similarly, folivores are significantly larger than insectivores, as predicted, though the proposed body mass boundary was not supported. These results suggest that shear crest length and body mass are indeed linked to diet in the proposed manner. It may now be possible to use these findings to gain a greater understanding of the feeding behaviours of a variety of extinct marsupials and other therians.

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Motor Control of Masticatory Movements in the Southern Hairy-Nosed Wombat (Lasiorhinus latifrons)

Cited by 24 publications

References 29 publications

Three dimensional digital reconstruction of the jaw adductor musculature of the extinct marsupial giantDiprotodon optatum

Three dimensional digital reconstruction of the jaw adductor musculature of the extinct marsupial giantDiprotodon optatum

New genus of primitive wombat (Vombatidae, Marsupialia) from Miocene deposits in the Riversleigh World Heritage Area (Queensland, Australia)

Molar crests and body mass as dietary indicators in marsupials

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