Mandibular allometry in Hydrochoerus hydrochaeris (Linnaeus, 1766) (Hydrocherinae, Caviidae)

Casanova, Pere-Miquel Parés

doi:10.11606/0031-1049.2017.57.35

Cited by 3 publications

(2 citation statements)

References 24 publications

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“…Importantly, different zygomasseteric conditions obtainable in rodents are not biomechanically equivalent and may enable rodents to be more efficient at different diet types. Hystricomorphy (possession of a large infraorbital foramen in Ctenohystrica + Anomaluromorpha + Dipodidae) through which the medial masseter passes as seen in Jerboas, porcupines and Capybaras [37] favouring efficient molar chewing whereas myomorphs are well adapted to all feeding modes and generates efficient incisor gnawing which may impact occipital area morphology [16].…”

Section: Introductionmentioning

confidence: 99%

“…Recent works has shown that these ecologically-driven shape changes, though mostly concentrated in the cranium, morphometric studies in this regard have played important roles in resolving taxonomic problems [9]. In comparison to studies in felids, it has been demonstrated that with skull and limbs measurements it was possible to correctly discriminate between species' Existing relevant works includes, Angelici et al [3] who studied morphometric variations on the skull of the Italian crested porcupine (Hystrix cristata), Parés-Casanova [37] on Hydrochoerus hydrochaeris. More specifically our aim is to test the following hypotheses: -Size influences subterranean shape differences between these species in ontogeny and allometric perspectives; -Species follow distinct phenotypic patterns of skull components shape changes in relation to broad phylogenic distances;…”

Section: Introductionmentioning

confidence: 99%

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Comparative topographic analyses on the foramen magnums of two hystricomorphs: the crested porcupine (Hystrix cristata) and greater cane rat (Thryonomys swinderianus). Implications for typology, phylogeny and evolution in rodents

2020

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Background: This investigation aims to assess species comparison of foramen magnums in two hystricomorphs and endeavours an inter-species categorisation of individual shape outline. Materials and methods: This study utilised 35 skull samples of different ages from the crested porcupine (H. cristata) ( 17) and the greater cane rat (T. swinderianus) (18) through. Elliptical Fourier Analysis, and the two-block Partial Least Squares analysis. Elliptical Fourier descriptor analyses presented marked amplitude related attenuations according to harmonics factor (1/10 to 2,980) in T. swinderianus though angular orientations in the major axis were not profoundly affected by size-normalisation in this species but up-regulated in H. cristata; (1/10 to1/95). Results: Within and between groups analyses revealed PC1&2 contributed 98.94% and 1.06% but 100% PC1 between groups. The 1 st to 4 th harmonics gave full topographic description of the foramen magnums in both, 1 st -3 rd harmonics details compared differently revealing shape variance concentrated in posterolateral and posterior regions of the foramen magnum in the porcupine but antero-lateral and dorsal in cane rats, components of morphological asymmetry were demonstrated from 6 th to 12 th harmonics. Stepwise discriminant analysis of harmonic increments and Mahalanobis distance exposed increasing disparities between both up to the 5 th harmonic p < 0.002] group centroids) and a slightly lower value in variance for cane rats 0.421 and 0.378 for porcupines. A (58.3% and 33.3%); (94.1% and 11.1%) proportion before and after size-normalised evaluations of porcupines and cane rats size factor removal yielded 35.8% increase in accuracy among crested porcupines but 22.2% decline in cane rats. Dimorphic variations were less frequently expressed in cane rats corresponding to 33.3% and 44.2%. Size normalisation effect brought a reverse situation with an increased difference (11.1% in T. swinderianus; 5.9% in H. cristata). Individual specimen distribution along discriminant axis pooled by discriminant scores depicted less morphologic variability with greater overlaps.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparative topographic analyses on the foramen magnums of two hystricomorphs: the crested porcupine (Hystrix cristata) and greater cane rat (Thryonomys swinderianus). Implications for typology, phylogeny and evolution in rodents

2020

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Applied anatomic and phylogenetic considerations of surgical and regional nerve block landmarks on the skull and mandibles of two hystricomorphs; the crested porcupine (Hystrix cristata) and greater cane rat (Thryonomys swinderianus)

Samuel

Kisani

2020

Translational Research in Anatomy

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Anatomy of the skull in the capybara (Hydrochoerus hydrochaeris) using radiography and 3D computed tomography

Pereira

Bete

Inamassu

et al. 2020

Anat Histol Embryol

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The capybaras (Hydrochoerus hydrochaeris) are the largest rodent found throughout South America and are present in almost all the Brazilian territory, however, still lack basic descriptions about the species, such as about their cranial anatomy. This study was carried out to investigate the anatomical features in the capybara skull. Eight skulls and two heads, without sexual distinction, were used for the osteological, radiographic and tomographic identification of their structures. The skull of the capybara could be divided into a neurocranium and a viscerocranium. The capybara had a more robust and rectangular skull, elongated face caudally, thinned in the nasal region and slightly convex in the parietal region. The zygomatic arch was expanded and wide, the orbit had a circular shape, the infraorbital foramen was well developed, external acoustic meatus and tympanic bulla were relatively small, and the paracondylar process was large. These anatomical characteristics are compatible with the eating habit and semi‐aquatic life of capybaras, which can be compared with characteristics reported for animals of similar habits. The radiographic image allowed to identify structures such as the frontal sinus, whereas 3D tomographic reconstruction was essential to have a spatial view of the skull of the capybara.

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Mandibular allometry in Hydrochoerus hydrochaeris (Linnaeus, 1766) (Hydrocherinae, Caviidae)

Cited by 3 publications

References 24 publications

Comparative topographic analyses on the foramen magnums of two hystricomorphs: the crested porcupine (Hystrix cristata) and greater cane rat (Thryonomys swinderianus). Implications for typology, phylogeny and evolution in rodents

Comparative topographic analyses on the foramen magnums of two hystricomorphs: the crested porcupine (Hystrix cristata) and greater cane rat (Thryonomys swinderianus). Implications for typology, phylogeny and evolution in rodents

Applied anatomic and phylogenetic considerations of surgical and regional nerve block landmarks on the skull and mandibles of two hystricomorphs; the crested porcupine (Hystrix cristata) and greater cane rat (Thryonomys swinderianus)

Anatomy of the skull in the capybara (Hydrochoerus hydrochaeris) using radiography and 3D computed tomography

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