Show simple item record

dc.contributor.authorBasso, Ana Pen
dc.contributor.authorSidorkewicj, Nora Sen
dc.contributor.authorCasanave, Emma Ben
dc.contributor.authorMason, Matthewen
dc.date.accessioned2019-12-03T00:30:29Z
dc.date.available2019-12-03T00:30:29Z
dc.date.issued2020-05en
dc.identifier.issn0021-8782
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/299483
dc.description.abstractThe pink fairy armadillo Chlamyphorus truncatus is the smallest extant armadillo and one of the least-known fossorial mammals. The aim of this study was to establish if its middle ear is specially adapted to the subterranean environment, through comparison with more epigeic relatives of the groups Euphractinae (Chaetophractus villosus, Chaetophractus vellerosus, Zaedyus pichiy) and Dasypodinae (Dasypus hybridus). We examined the middle ears using micro-computed tomography and subsequent 3D reconstructions. Dasypus hybridus has a relatively small middle ear cavity, an incomplete bulla and ‘ancestral’ ossicular morphology. The other species, including Chlamyphorus, have fully ossified bullae and middle ear ossicles with a morphology between ‘transitional’ and ‘freely mobile’, but in all armadillos the malleus retains a long anterior process. Unusual features of armadillo ears include the lack of a pedicellate lenticular apophysis and the presence, in some species, of an element of Paaw within the stapedius muscle. In common with many subterranean mammals, Chlamyphorus has a relatively flattened malleo-incudal articulation and appears to lack a functional tensor tympani muscle. Its middle ear cavity is not unusually enlarged, and its middle ear ossicles seem less robust than those of the other armadillos studied. In comparison with the euphractines, there is no reason to believe that the middle ear of this species is specially adapted to the subterranean environment; some aspects may even be indicative of degeneration. The screaming hairy armadillo, C. vellerosus, has the most voluminous middle ear in both relative and absolute terms. Its hypertrophied middle ear cavity likely represents an adaptation to low-frequency hearing in arid rather than subterranean conditions.
dc.description.sponsorshipArgentinian research grants: Secretaría General de Ciencia y Tecnología, UNS (Project PGI 24/B243); Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) through a PhD fellowship to APB; Subsecretaría de Relaciones Internacionales, UNS, through a grant to APB.
dc.format.mediumPrint-Electronicen
dc.languageengen
dc.rightsAll rights reserved
dc.rights.uri
dc.subjectEar, Middleen
dc.subjectEar Ossiclesen
dc.subjectAnimalsen
dc.subjectArmadillosen
dc.subjectX-Ray Microtomographyen
dc.titleThe middle ear of the pink fairy armadillo Chlamyphorus truncatus (Xenarthra, Cingulata, Chlamyphoridae): comparison with armadillo relatives using computed tomography.en
dc.typeArticle
prism.endingPage826
prism.issueIdentifier5en
prism.publicationDate2020en
prism.publicationNameJournal of anatomyen
prism.startingPage809
prism.volume236en
dc.identifier.doi10.17863/CAM.46555
dcterms.dateAccepted2019-12-02en
rioxxterms.versionofrecord10.1111/joa.13146en
rioxxterms.versionAM
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2020-05en
dc.contributor.orcidBasso, Ana P [0000-0002-5594-7096]
dc.contributor.orcidMason, Matthew [0000-0001-7845-0720]
dc.identifier.eissn1469-7580
rioxxterms.typeJournal Article/Reviewen
cam.orpheus.successTue Mar 31 10:38:17 BST 2020 - Embargo updated*
cam.orpheus.counter2*
rioxxterms.freetoread.startdate2021-01-29


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record