Navegando por Palavras-chave "Pristimantis"

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    Chromosomal analysis of three Brazilian eleutherodactyline frogs (Anura : Terrarana), with suggestion of a new species
    (Magnolia Press, 2008-09-01) Siqueira, Sergio; Aguiar, Odair [UNIFESP]; Struessmann, Christine; Del-Grande, Maria Lucia; Recco-Pimentel, Shirlei Maria; Universidade Estadual de Campinas (UNICAMP); Universidade Federal de São Paulo (UNIFESP); Univ Fed Mato Grosso; Univ Estadual Sudoeste Bahia
    The karyotypes of four Brazilian eleutherodactyline samples were analyzed aiming to provide additional cytogenetic data for future understanding of the evolutionary and systematic relationships of this large anuran group. The populations consisted of Pristimantis dundeei (Chapada dos Guimaraes and Rondonopolis, Mato Grosso), Pristimantis aff. dundeei (Aripuana, Mato Grosso) and Ischnocnema paulodutrai (Ilheus, Bahia). The data revealed that P. dundeei and P. aff. dundeei have 2n=28 chromosomes, whereas I. paulodutrai has 2n=30. All pairs of chromosomes were telocentric, except for the subtelocentric pair 4 in I. paulodutrai. Differences in Ag-NOR pattern and interstitial heterochromatin positions clearly distinguished P. aff. dundeei from P. dundeei, and differentiated them from I. paulodutrai. The specimens of I. paulodutrai showed two distinct color patterns, but they did not differ in their cytogenetic characteristics. Karyotypes with 2n=28 and 2n=30 chromosomes have not been previously described for Brazilian eleutherodactylines which, to date, had been characterized as 2n=20, 2n=22 and 2n=34. The NOR position differences identified between P. dundeei and P. aff. dundeei, allied to their known distinct behavior and ecological data, suggested that the P. aff. dundeei from the Aripuana sampling location is a new species. Similarities between I. paulodutrai and species currently assigned to Pristimantis are herein discussed on the basis of chromosome number and morphological characteristics.
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    The karyotype of three Brazilian Terrarana frogs (Amphibia, Anura) with evidence of a new Barycholos species
    (Sociedade Brasileira de Genética, 2009-01-01) Siqueira, Sérgio; Aguiar, Odair [UNIFESP]; Pansonato, André; Giaretta, Ariovaldo A.; Strüssmann, Christine; Martins, Itamar Alves; Recco-Pimentel, Shirlei Maria; Universidade Estadual de Campinas (UNICAMP); Universidade Federal de São Paulo (UNIFESP); Universidade Federal de Mato Grosso; Universidade Federal de Uberlândia Instituto de Biologia Departamento de Biociências; Universidade Federal de Mato Grosso Departamento de Ciências Básicas e Produção Animal; Universidade de Taubaté Departamento de BiologiaAnimal
    A recent substantial rearrangement of the 882 described eleutherodactyline frog species has considerably improved the understanding of their systematics. Nevertheless, many taxonomic aspects of the South American eleutherodactyline species remain unknown and require further investigation using morphological, cytogenetic and molecular approaches. In this work, the karyotypes of the Brazilian species Ischnocnema juipoca (Atibaia and Campos do Jordão, SP), Barycholos cf. ternetzi (Uberlândia, MG, and Porto Nacional, TO), and Pristimantis crepitans (Chapada dos Guimarães and São Vicente, MT) were analyzed using Giemsa staining, Ag-NOR labeling, and C-banding techniques. All individuals had a diploid number of 22 chromosomes, but the Fundamental Numbers were different among species. The herein described low chromosome number of Pristimantis crepitans is unique within this genus, suggesting that cytogenetically this species is not closely related either to its congeneric species or to Ischnocnema. In addition, karyotype differences, mainly in the NOR position, clearly distinguished the two Barycholos populations, besides indicating the existence of a so far undescribed species in this genus. A taxonomic review could clarify the systematic position of P. crepitans and verify the hypothetic new Barycholos species.