The middle ear of the pink fairy armadillo Chlamyphorus truncatus (Xenarthra, Cingulata, Chlamyphoridae): comparison with armadillo relatives using computed tomography
| Autor: | Emma Beatriz Casanave, Nora Silvia Sidorkewicj, Ana Paula Basso, Matthew J. Mason |
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| Přispěvatelé: | Basso, Ana P [0000-0002-5594-7096], Apollo - University of Cambridge Repository |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
Armadillos Histology subterranean Ear Middle LENTICULAR APOPHYSIS Ciencias Biológicas 03 medical and health sciences 0302 clinical medicine Chaetophractus biology.animal morphology medicine otorhinolaryngologic diseases Animals ARMADILLOS Molecular Biology Ecology Evolution Behavior and Systematics Ear Ossicles biology Ossicles lenticular apophysis Malleus SUBTERRANEAN Cell Biology Anatomy Original Articles X-Ray Microtomography Zoología Ornitología Entomología Etología biology.organism_classification MIDDLE EAR 030104 developmental biology medicine.anatomical_structure middle ear Armadillo Middle ear Pink fairy armadillo MORPHOLOGY sense organs Dasypus 030217 neurology & neurosurgery Chaetophractus vellerosus CIENCIAS NATURALES Y EXACTAS Developmental Biology |
| Zdroj: | J Anat |
| DOI: | 10.1111/joa.13146 |
| Popis: | The 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 three‐dimensional reconstructions. D. 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, Chaetophractus 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. Fil: Basso, Ana Paula. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Ciencias Biológicas y Biomédicas del Sur. Universidad Nacional del Sur. Departamento de Biología, Bioquímica y Farmacia. Instituto de Ciencias Biológicas y Biomédicas del Sur; Argentina Fil: Sidorkewicj, Nora Silvia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Ciencias Biológicas y Biomédicas del Sur. Universidad Nacional del Sur. Departamento de Biología, Bioquímica y Farmacia. Instituto de Ciencias Biológicas y Biomédicas del Sur; Argentina Fil: Casanave, Emma Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Ciencias Biológicas y Biomédicas del Sur. Universidad Nacional del Sur. Departamento de Biología, Bioquímica y Farmacia. Instituto de Ciencias Biológicas y Biomédicas del Sur; Argentina Fil: Mason, Matthew James. University of Cambridge; Estados Unidos |
| Databáze: | OpenAIRE |
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