Consulta: subjectFacets:"Oryzomyini"
Registros recuperados: 6
Data/hora: 09/06/2024 15:36:58

A remarkable autosomal heteromorphism in Pseudoryzomys simplex 2n = 56; FN = 54-55 (Rodentia, Sigmodontinae)
Provedor de dados: Genetics and Molecular Biology
Autores: Moreira,Camila Nascimento; Di-Nizo,Camilla Bruno; Silva,Maria José de Jesus; Yonenaga-Yassuda,Yatiyo; Ventura,Karen.
Pseudoryzomys simplex, the false rice rat, is a monotypic genus of the Oryzomyini tribe (Sigmodontinae) distributed in part of Bolivia, Paraguay, Argentina and Brazil. Its diploid number has been described as 56 acrocentric chromosomes decreasing in size and no karyotype figure has been depicted. Herein, we present karyotypic data on P. simplex, including chromosome banding and molecular fluorescent in situ hybridization using telomeric sequences and the whole X-chromosome of its sister clade Holochilus brasiliensis (HBR) as probes. A case of remarkable autosomal heteromorphism due to the presence of a whole heterochromatic arm leading to the variability of FN is reported, as well as the occurrence of regions of homology between the X and Y chromosomes...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cytogenetics; Fluorescent in situ hybridization; Heterochromatin; Oryzomyini.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572013000200010

Karyological geographic variation of Oligoryzomys nigripes Olfers, 1818 (Rodentia, Cricetidae) from Brazil
Provedor de dados: Genetics and Molecular Biology
Autores: Paresque,Roberta; Silva,Maria José de Jesus; Yonenaga-Yassuda,Yatiyo; Fagundes,Valéria.
The karyotypes of 85 specimens of Oligoryzomys nigripes (Rodentia, Sigmodontinae) collected in the Cerrado and Atlantic Forest of seven states of Brazil were analyzed. Eighty four specimens presented a karyotype with 2n = 62 and one individual had 2n = 61 due to a monosomy of the X chromosome. High levels of intra- and inter-population karyotypic variability, due to sex chromosomes heteromorphisms and pericentric inversions in four autosomes (pairs 2, 3, 4 and 8), led to a variation of the autosomal arm numbers (fundamental number, FN) from 78 to 82. Synaptonemal complex analyses revealed normal meiosis in males heterozygous for pericentric inversions. We found 39 different cytotypes, 27 of which are herein described for the first time. A literature survey...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pericentric inversion; Oryzomyini; Oligoryzomys nigripes; Rodentia; Clinal variation.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000100010

Distribution of Pseudoryzomys Simplex (Rodentia: Cricetidae) in Argentina
Provedor de dados: Mastozoología Neotropical
Autores: Pardiñas,Ulyses F.J.; Cirignoli,Sebastian; Galliari,Carlos A.
We report new records for the poorly known sigmodontine rodent Pseudoryzomys simplex in Argentina, totalizing 28 recording localities (Formosa, Chaco, and Santa Fe provinces). The southern limit of the species is about 30ºS and its distribution, in Argentina, is mainly restricted to the Eastern Chaco biome.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sigmodontinae; Oryzomyini; Neotropics; Biogeography; Sigmodontinae; Oryzomyini; Neotrópico; Biogeografía.
Ano: 2004
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-93832004000100013

Redescripción de Eremoryzomys polius (Rodentia: Cricetidae) y descripción de una nueva especie del género Eremoryzomys
Provedor de dados: Mastozoología Neotropical
Autores: Uturunco,Angie C. J; Pacheco,Víctor R.
Eremoryzomys polius (Osgood 1913) es un roedor orizomyino endémico de la cuenca alta del río Marañón, Perú, del que solo se conocen 15 ejemplares procedentes de 7 localidades y que no había sido regis­trado en los últimos 22 años. En este trabajo se reportan 4 localidades nuevas para E. polius, que expanden la distribución de este roedor. Adicionalmente, describimos una especie nueva para el género Eremoryzomys en base a la comparación de caracteres morfológicos cualitativos y cuantitativos con E. polius. La especie nueva de Eremoryzomys se diferencia de E. polius en los siguientes rasgos: cola corta ligeramente bicoloreada; almohadillas de las patas posteriores oscuras; almohadillas tenar e hipotenar casi contiguas; cráneo más pequeño, con un rostro corto...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biogeografía; Endemismo; Oryzomyini; Río Marañón; Taxonomía.
Ano: 2016
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-93832016000200020

Annual male reproductive cycle of a Hantavirus reservoir, the long-tailed mouse Oligoryzomys flavescens (Rodentia; Cricetidae, Sigmodontinae) from Uruguay
Provedor de dados: Mastozoología Neotropical
Autores: Boiani,Lucía; Berois,Nibia; D'Elía,Guillermo.
We studied the reproductive cycle in males of the cricetid rodent species Oligoryzomys flavescens (Waterhouse, 1837), collected in northern Uruguay. From February 2001 to February 2002, specimens were captured in grasslands and exotic forests. Determination of the reproductive condition was based on external characteristics of gonads as well as histological and histometric analysis. The testicular volume was measured and testes position (whether scrotal or intra-abdominal) was verified by dissection. Correlations between these anatomical features and some environmental factors that included temperature, precipitation and photoperiod, were analyzed using linear regression analysis. The annual reproductive cycle of O. flavescens was characterized by a period...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hantavirus reservoir; Male reproductive cycle; Oryzomyini; Spermatogenic activity.
Ano: 2008
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-93832008000100003

NEW DATA ON THE THREATENED Cerradomys goytaca (RODENTIA, CRICETIDAE)
Provedor de dados: Acta Biológica Colombiana
Autores: BRANDÃO,Marcus Vinicius; ROSA,Beatris FELIPE; FEGIES,Ana Claudia; BELENTANI,Sonia CRISTINA DA SILVA.
ABSTRACT Cerradomys goytaca is a cricetid rodent endemic to "Restinga" formations from southeastern Atlantic Forest. It is known from only five localities, and it is considered endangered of extinction. Herein, we furnish new data on C. goytaca from an additional locality in Rio de Janeiro state. The present record provides new data on habitat and represents the westernmost geographic limit of this poorly known species.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: New record; Oryzomyini; Restinga-Rice-Rat; Sigmodontinae.
Ano: 2022
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2022000100127