A new karyotype of Calomys (Rodentia, Sigmodontinae)

Lima, José Fernando de Sousa; Kasahara, Sanae

doi:10.1590/s0073-47212001000200019

Cited by 4 publications

(1 citation statement)

References 6 publications

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“…In our study, it always formed a monophyletic group strongly associated with C. callosus s.s. (Figures 2 and 3). All cytogenetic studies have revealed a 2n = 46 (FN = 66; Bonvicino et al, 2003Bonvicino et al, , 2010Fagundes et al, 2000;Lima & Kasahara, 2001). Specimens of C. tocantinsi have been collected in several sites in the Tocantins, and Mato Grosso states from Brazil corresponding to the Cerrado ecoregion and its ecotone with the Amazonian rainforest (Salazar-Bravo, 2015).…”

Section: Integration Of Molecular Data With Geographic Distributions ...mentioning

confidence: 99%

Molecular systematics and biogeographic insights of the Calomys callosus complex (Rodentia, Cricetidae)

et al. 2022

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The genus Calomys includes several species that have very similar external morphologies, which often leads to confusing field identification and has resulted in conflictive taxonomic histories. One of its clades involves large‐sized body forms, known as the Calomys callosus complex. In a previous study, a biogeographic hypothesis was proposed to explain a south‐to‐north colonisation of South America by species of this complex. However, other studies which not included all members of the complex' members and that used different molecular markers, did not support that biogeographic hypothesis. Here we explore the relationships among C. callosus sensu stricto (s.s.), C. fecundus, C. callidus, C. venustus, C. tocantinsi and Calomys sp. using two mitochondrial genes (Cyt‐b and Control Region) and two nuclear genes (Rhp3 and i7FGB) data. We also applied several gene trees and species delimitation methods to elucidate the taxonomy, distribution and evolutionary relationships among the analysed species. By including sequences of individuals from Argentina, Brazil, Bolivia and Paraguay, we reconstructed the possible ancestral biogeographic origin of the complex. Two main clades were recovered: the western showed the relationships (C. venustus [C. fecundus–Calomys sp.]), while the eastern (C. callidus [C. callosus s.s.–C. tocantinsi]). These results support the original biogeographic hypothesis and suggest the following scenario: in the west, from the Espinal ecoregion, first the Tucumane–Bolivian Yungas and later, the Beni savanna would have been colonised. In the east, from the Espinal, first the Chaco and later the Cerrado ecoregions may have been occupied.

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Section: Integration Of Molecular Data With Geographic Distributions ...mentioning

confidence: 99%

Molecular systematics and biogeographic insights of the Calomys callosus complex (Rodentia, Cricetidae)

et al. 2022

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Taxonomic status of large- and middle-sizedCalomys(Cricetidae: Sigmodontinae) from the southern central Andes inferred through geometric morphometrics of the skull

Martínez

Sandoval

Carrizo

2016

JMAMMAL

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A new species of Calomys (Rodentia: Sigmodontinae) from Eastern Brazil

Bonvicino

Oliveira

Gentile

2010

Zootaxa

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On the basis of combined analyses of karyotypic, molecular and morphologic data, we herein describe a new Calomys species collected in a transitional area between the Atlantic Forest and the Cerrado morphoclimatic domains of eastern Brazil. This new taxon differs from all other Brazilian Calomys species by its diploid number (2n=38), the lowest among Brazilian Calomys species, and by its yellowish snout. Phylogenetic analyses based on cytochrome b DNA suggest that this species belongs to the larger-bodied species group within Calomys, together with C. expulsus, C. callidus, C. callosus, and C. tocantinsi.

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A new karyotype of Calomys (Rodentia, Sigmodontinae)

Cited by 4 publications

References 6 publications

Molecular systematics and biogeographic insights of the Calomys callosus complex (Rodentia, Cricetidae)

Molecular systematics and biogeographic insights of the Calomys callosus complex (Rodentia, Cricetidae)

Taxonomic status of large- and middle-sizedCalomys(Cricetidae: Sigmodontinae) from the southern central Andes inferred through geometric morphometrics of the skull

A new species of Calomys (Rodentia: Sigmodontinae) from Eastern Brazil

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