Descripción del postcráneo de Rhipidomys austrinus y Graomys griseoflavus (Rodentia, Cricetidae, Sigmodontinae)

Carrizo, Luz Valeria; Díaz, M. Mónica

doi:10.1590/s0073-47212011000200008

Cited by 10 publications

(8 citation statements)

References 29 publications

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“…On the other hand, the postcranial elements of the forelimbs and hind limbs of the four species of the genus show an anatomical plan related to the mode of terrestrial life, consistent with what was observed in other rodents and marsupials, for example the posterior extension of the humeral head forming a “peak”, the tubercles not surpassing the head, the separation between the trochlea and the capitulum, the flat or just concave articular surface of the radial notch in the ulna, the diaphysis of the radio curved, the extension of the greater trochanter above the femoral head, the posterior or posteromedial position of the third trochanter, and the asymmetry between the lateral and medial condyles, with the lateral wider (Hatt 1932; Sargis 2002a, b; Argot 2003; Candela and Picasso 2008; Flores and Diaz 2009; Olivares 2009; Carrizo and Diaz 2011). However, because the genus Tympanoctomys is semi-fossorial and scratch digging, characteristics in their long bones were expected which reflected their digging habit (Elissamburu and Vizcaino 2004; Morgan and Verzi 2006; Samuels and Van Valkenburgh 2008, 2009; Salton and Sargis 2008; Hopkins and Davis 2009).…”

Section: Discussionmentioning

confidence: 99%

Morphology of the limbs in the semi-fossorial desert rodent species of Tympanoctomys (Octodontidae, Rodentia)

Perez¹,

Bárquez²,

Díaz³

2017

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Here, a detailed description of the forelimbs and hindlimbs of all living species of the genus Tympanoctomys are presented. These rodents, highly adapted to desert environments, are semi-fossorial with capacity to move on the surface as well as to build burrows. The shape, structure, and size of the limbs are described. Contrary to what was expected for scratch digging semi-fossorial species, Tympanoctomys have slender humerus, radius and ulna; with narrow epicondyles of the humerus and short olecranon of the ulna with poorly developed processes. Following our descriptions, no intrageneric morphological variation regarding to the configuration of the limbs was detected, probably due to phylogenetic proximity, and not related to specific variations in response to different use of substrates or habits. The obtained results constitute a source of previously unpublished information as well as an important base for future analysis in different studies, such as morphometric, morpho-functional, or phylogenetic researches.

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Section: Discussionmentioning

confidence: 99%

Morphology of the limbs in the semi-fossorial desert rodent species of Tympanoctomys (Octodontidae, Rodentia)

Perez¹,

Bárquez²,

Díaz³

2017

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“…Also, sigmodontines rodents show a variety of locomotory types, including generalized ambulatory as well as highly specialized forms (e.g., natatorial and fossorial) (Rodríguez-Serrano et al 2008;Rivas et al 2010;Carrizo et al 2014a). Despite this extraordinary ecological diversity, relatively few studies have been conducted to detect a possible correlation between the morphology of forelimb and locomotory types (Samuels and Van Valkenburgh 2008 and references therein;Carrizo and Díaz 2011;Carvalho Coutinho et al 2013;Carrizo et al 2014aCarrizo et al , 2014b. In this context, we analyzed the morphometric diversity of claws across 25 species of sigmodontines rodents with different locomotor types (ambulatory, fossorial, quadrupedal saltatorial, natatorial, and scansorial) to test if these ecological categories are characterized by different claw and forelimb skeleton morphologies and to test whether part of the variability of our data set is explained by phylogeny instead of adaptation.…”

Section: Introductionmentioning

confidence: 99%

Morphological Variation of the Forelimb and Claw in Neotropical Sigmodontine Rodents (Rodentia: Cricetidae)

2015

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The limbs of mammals exhibit a variety of morphologies that reflect the diversity of their habitats and their functional needs, including subtle structural differences in their distal limb integumentary appendages (hooks, claws, adhesive pads). Little is known about structure and function of claws of sigmodontine rodents. Here, we analyze claw shape and forelimb skeleton morphology of 25 species of sigmodontine rodents with different locomotory types (ambulatory, fossorial, natatorial, quadrupedal saltatorial, and scansorial), taking into account their phylogenetic affinities. Qualitative differences in claw shape were examined using digital photographs, and quantitative measurements were made for length, height, and curvature of the claws of all digits, and dimensions of other forelimb skeletal elements. Our results show that both phylogeny and ecological categories explain substantial components of the morphological variation in sigmodontine rodents. Qualitative analysis reveals that non-specialized forms (ambulatory, quadrupedal saltatorial, and scansorial) tend to have high and strongly curved claws, whereas highly specialized forms (fossorial and natatorial) tend to have elongate and smoothly curved claws. However, the quantitative analysis differentiated the fossorial and scansorial by variables related to claw, and natatorial by variables related to bones of the forelimb. No variables that could differentiate ambulatory or quadrupedal saltatorial forms were found, demonstrating that these forms show a generalized morphological pattern. This study indicates that both historical and ecological factors contribute to the evolution of claw length in these groups.

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“…Despite the high diversity of Sigmodontinae and the remarkable ecological diversity, relatively few studies have been conducted on the locomotion modes and associated morphological variation in this group (Hershkovitz, , , , , , ; Stein, ; Voss, ; Neves, ; Rivas & Linares, ; Rivas‐Rodríguez et al. ; Carrizo & Díaz, ; Coutinho et al. ; Carrizo et al.…”

Section: Introductionmentioning

confidence: 99%

“…Stein (), Neves (), Rivas & Linares (), Rivas‐Rodríguez et al. () and Carrizo & Díaz () studied the variation of the postcranial skeleton of the sigmodontine rodents, as well as external characters, in order to relate them to the different locomotion modes.…”

Section: Introductionmentioning

confidence: 99%

“…Sigmodontines also exhibit a great variety of locomotion modes, with semiaquatic, terrestrial, semifossorial, fossorial, scansorial and arboreal forms (Hershkovitz, 1948(Hershkovitz, , 1955(Hershkovitz, , 1960(Hershkovitz, , 1962Pearson, 1984). Despite the high diversity of Sigmodontinae and the remarkable ecological diversity, relatively few studies have been conducted on the locomotion modes and associated morphological variation in this group (Hershkovitz, 1948(Hershkovitz, , 1955(Hershkovitz, , 1960(Hershkovitz, , 1962(Hershkovitz, , 1969(Hershkovitz, , 1972Stein, 1988;Voss, 1988;Neves, 2003;Rivas & Linares, 2006;Rivas-Rodr ıguez et al 2010;Carrizo & D ıaz, 2011;Coutinho et al 2013;Carrizo et al 2014a,b). Lund (1840) was the first to examine characters of the appendicular skeleton of Sigmodontinae rodents, primarily in a taxonomic context, but also in order to relate the appendicular variation to the different locomotion modes.…”

Section: Introductionmentioning

confidence: 99%

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Relating appendicular skeletal variation of sigmodontine rodents to locomotion modes in a phylogenetic context

Coutinho

Oliveira

2017

Journal of Anatomy

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Sigmodontinae rodents constitute the second-largest subfamily among mammals. Alongside the taxonomic diversity, they are also ecologically diverse, exhibiting a wide array of locomotion modes, with semifossorial, terrestrial, semiaquatic, scansorial, arboreal, and saltatorial forms. To understand the ecomorphologic aspects that allow these rodents to display such locomotion diversity, we analyzed 35 qualitative characters of the appendicular skeleton (humerus, ulna, radius, scapula, femur, tibia, ilium, ischium and pubis) in 795 specimens belonging to 64 species, 34 genera and 10 tribes, representing all locomotion modes assigned to this subfamily. We performed a statistical analysis based upon the coefficient of trait differentiation to test the congruence of character states and the different locomotion modes. We also mapped characters states in a molecular phylogeny in order to reconstruct ancestral states and to evaluate how appendicular characters evolved within main lineages of Sigmodontinae radiation under a phylogenetic framework. The statistical analyses revealed six characters related to specific locomotion modes, except terrestrial. The mapping and parsimony ancestral states reconstruction identified two characters with phylogenetical signal and eight characters that are exclusively or more frequently recorded in certain modes of locomotion, four of them also detected by the statistical analysis. Notwithstanding the documented morphological variation, few changes characterize the transition to each of the locomotion modes, at least regarding the appendicular skeleton. This finding corroborates previous results that showed that sigmodontines exhibit an all-purpose appendicular morphology that allows them to use and explore a great variety of habitats.

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Descripción del postcráneo de Rhipidomys austrinus y Graomys griseoflavus (Rodentia, Cricetidae, Sigmodontinae)

Cited by 10 publications

References 29 publications

Morphology of the limbs in the semi-fossorial desert rodent species of Tympanoctomys (Octodontidae, Rodentia)

Morphology of the limbs in the semi-fossorial desert rodent species of Tympanoctomys (Octodontidae, Rodentia)

Morphological Variation of the Forelimb and Claw in Neotropical Sigmodontine Rodents (Rodentia: Cricetidae)

Relating appendicular skeletal variation of sigmodontine rodents to locomotion modes in a phylogenetic context

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