Blarinomys breviceps

Matson, John O.; Abravaya, J. Paul

doi:10.2307/3503793

Cited by 9 publications

(8 citation statements)

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“…The monotypic genus Blarinomys Thomas, 1896 belongs to the tribe Akodontini, an assemblage of sigmodontine rodents with adaptations to terrestrial or fossorial habits [Smith and Patton, 1999]. Blarinomys breviceps is endemic to the Atlantic Forest and shows a set of adaptive morphological traits, including a short conical head, very small eyes and ears, a short tail, and pronounced claws qualified for burrowing [Moojen, 1952;Matson and Abravaya, 1977].…”

mentioning

confidence: 99%

Phylogeographic Structure and Karyotypic Diversity of the Brazilian Shrew Mouse (Blarinomys breviceps, Sigmodontinae) in the Atlantic Forest

Ventura

Sato-Kuwabara²,

Fagundes

et al. 2012

Cytogenet Genome Res

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Blarinomys breviceps possesses cryptic and burrowing habits with poorly documented genetics and life history traits. Due to its rarity, only a few specimens and DNA sequences have been deposited in collections worldwide. Here, we present the most comprehensive cytogenetic and molecular characterization of this rare genus. Phylogenetic analyses based on partial cytochrome b sequences were performed, attempting to establish the relationships among individuals with distinct karyotypes along the geographic distribution of the genus in the Atlantic Forest. Classical and molecular cytogenetics, using banding patterns and FISH of telomeric and whole chromosome X-specific painting probes (obtained from the Akodontini Akodon cursor) were used to characterize and compare the chromosomal complements. Molecular phylogenetic analyses recovered 2 main geographically structured clades, northeastern and southeastern with pairwise sequence divergences among specimens varying between 4.9 and 8.4%. Eight distinct karyomorphs are described: (A) 2n = 52 (50A, XX), (B) 2n = 52 (48A, XY+2Bs), (C) 2n = 45 (42A, XY+1B), (D) 2n = 43 (37A, XX+4Bs), (E) 2n = 37 (34A, XY+1B), (F) 2n = 34 (32A, XX), (G) 2n = 31 (27A, XX+2Bs), (H) 2n = 28 (26A, XY), all with the same number of autosomal arms (FN_A = 50). Variation of 0–4 supernumerary chromosomes (Bs) presenting heterogeneity in morphology and distribution of interstitial telomeric sequences (ITSs) is reported. ITSs are also found in some metacentric autosomes. The phylogeographic separation between 2 major lineages with high levels of genetic divergence, and the wide karyotypic diversity indicate that B. breviceps is a diverse group that warrants taxonomic re-evaluation.

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confidence: 99%

Phylogeographic Structure and Karyotypic Diversity of the Brazilian Shrew Mouse (Blarinomys breviceps, Sigmodontinae) in the Atlantic Forest

Ventura

Sato-Kuwabara²,

Fagundes

et al. 2012

Cytogenet Genome Res

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“…, 2007), um grupo sul-americano de roedores sigmodontíneos que apresentam adaptações para uma vida exclusivamente terrestre e/ou semi-fossorial . O gênero é endêmico da Mata Atlântica e pouco conhecido em aspectos de sua biologia; apresenta características morfológicas adaptativas ao seu hábito fossorial que incluem cabeça curta e cônica, olhos diminutos, orelhas pequenas com poucos pêlos, cauda curta e garras bem desenvolvidas Matson e Abravaya, 1977).…”

Section: Discussionunclassified

Estudos de citogenética e de filogenia molecular em roedores da tribo Akodontini

Ventura¹

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Gostaria de agradecer às pessoas e entidades que colaboraram, de alguma maneira, para o desenvolvimento dessa Tese, assim como aquelas que fizeram com que esses dias de trabalho se tornassem mais proveitosos e prazerosos. À Professora Dra. Yatiyo Yonenaga-Yassuda, pela orientação, confiança e credibilidade no decorrer desses anos. À Dra. Maria José de Jesus Silva pela co-orientação desde a época da iniciação científica até os dias de hoje, pelas leituras críticas e pelo divertimento garantido. Ao Professor Dr. Miguel T. Rodrigues, meu padrinho na pesquisa, que me apresentou ao mundo maravilhoso da Citogenética de Vertebrados por se mostrar sempre entusiasmado e interessado durante o desenrolar desse trabalho. E também por toda surpreendente "habilidade" em se coletar tantos Blarinomys por aí…. Às chefias vigentes no Departamento de Genética e Biologia durante o período do desenvolvimente desse projeto, assim como as da comissão de Pós-Graduação. Ao Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), à Fundação de Amparo `a Pesquisa do Estado de São Paulo (FAPESP) e à Fundação Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) pelo apoio financeiro concedido para a realização desse trabalho. Ao Instituto Brasileiro do Meio Ambiente (IBAMA) pelas licenças de coleta e de transporte de células. Ao Professor Malcolm Ferguson-Smith por me receber em seu laboratório e ter sido tão generoso durante o tempo passado sob sua orientação. Às queridas companheiras do FISH Lab em Cambridge, Patrícia O'Brien, Maggie Wallduck, Fracis Lovel e Laura Hirst que me ensinaram que além de muita dedicação, o segredo de se conseguir excelentes resultados em chromosome painting é respeitar sempre o Tea time. Ao Willem Renz pelo conhecimento teórico transmitido sobre as técnicas de pintura cromossômica e por compartilhar o café na hora do chá. Aos companheiros de laboratório Renata Cecília, Rodrigo Guincho, Roberto Vilela, Carolina Elena e Marcinha e à agora professora Dra. Kátia Pepê pelas ajudas, inúmeras, durante esse tempo. À Patrícia Maltempi, querida companheira na Inglaterra pela amizade durante o tempo que passamos juntas em terras distantes. À Professora Dra. Ângela Vianna-Morgante por permitir o uso de sua sala de cultura e à Silvinha, sempre tão prestativa e carinhosa comigo e com minhas células.

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“…In species of semifossorial oryzomyalians, mainly Geoxus valdivianus , Paynomys macronyx , Blarinomys breviceps , and Thaptomys nigrita , the forelimbs were larger than in non‐semifossorial species with similar body size. These species use their large forelimbs to dig tunnels (Diório et al, 2011; Matson & Abravaya, 1977; Pearson, 1984; Teta et al, 2015), a condition convergent to several lineages of scratch‐digging rodents (Elissamburu & Vizcaíno, 2004; Tavares et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

Locomotor habits and phenotypic evolution of the appendicular skeleton in the oryzomyalian radiation in the Neotropics (Sigmodontinae, Cricetidae, Rodentia)

Tavares

Coutinho

Oliveira

2021

J Zool Syst Evol Res

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Sigmodontine rodents colonized South America in Late Miocene or earlier, leading to the clade Oryzomyalia, which rapidly radiated in distinct lineages and occupied almost all continental habitats, in a pattern classically interpreted as an adaptive radiation. Nevertheless, no evidence of strong influence of niche diversification on the evolution of cranial and mandibular morphology, or of deceleration in rates of phenotypic evolution in these structures over time following niche saturation, as expected according to the Ecological Opportunity model, has been detected. Here, we investigated morphometric variation among 59 oryzomyalian species using phylogenetically informed comparative analyses for testing (1) if the diversification of locomotor habits played an important role in shaping the morphology of the appendicular skeleton, and (2) if the disparification of appendicular skeleton showed high rates at the early diversification of Oryzomyalia and then has deaccelerated. Results showed that the different locomotor habits are associated with different shapes in both the forelimb and hindlimb, and selection of evolutionary models suggested that each locomotor habit was associated with their own adaptive optima. Moreover, the most extreme and specialized phenotypes, found in the semifossorial species Geoxus valdivianus, Blarinomys breviceps, and Paynomys macronyx, seem to have appeared after events of acceleration in the rates of morphological evolution. On the other hand, no evidence of a reduction in the rate of evolution over time was detected. The results suggest that the acquisition of different locomotor habits in oryzomyalians was associated with morphological specializations in the appendicular skeleton guided by natural selection and that, especially in the case of the evolution of fossoriality, there was a marked change in evolutionary regimes, generating highly modified phenotypes after acceleration of the pace of morphological changes. Despite the strong association between diversification of locomotor niches and evolution of the appendicular skeleton, the diversification of oryzomyalians does not seem to have experienced niche saturation, as noted in some other adaptive radiation events on Neotropics.

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Blarinomys breviceps

Cited by 9 publications

References 0 publications

Phylogeographic Structure and Karyotypic Diversity of the Brazilian Shrew Mouse (<b><i>Blarinomys breviceps</i></b>, Sigmodontinae) in the Atlantic Forest

Phylogeographic Structure and Karyotypic Diversity of the Brazilian Shrew Mouse (<b><i>Blarinomys breviceps</i></b>, Sigmodontinae) in the Atlantic Forest

Estudos de citogenética e de filogenia molecular em roedores da tribo Akodontini

Locomotor habits and phenotypic evolution of the appendicular skeleton in the oryzomyalian radiation in the Neotropics (Sigmodontinae, Cricetidae, Rodentia)

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