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Mammalia

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Volume 82, Issue 1

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The karyotype of Trinomys paratus (Rodentia: Echimyidae) with comments about its phylogenetic relationship

Ana Lazar
  • Corresponding author
  • Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios, Instituto Oswaldo Cruz, Fiocruz, Av. Brasil, 4365, 21045-900, Rio de Janeiro, RJ, Brazil
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  • Other articles by this author:
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/ Camila Nacif
  • Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios, Instituto Oswaldo Cruz, Fiocruz, Av. Brasil, 4365, 21045-900, Rio de Janeiro, RJ, Brazil
  • Departamento de Zoologia, Instituto de Biologia, Universidade Federal do Rio de Janeiro, 21941-590, Rio de Janeiro, RJ, Brazil
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  • De Gruyter OnlineGoogle Scholar
/ Marcelo Weksler
  • Setor de Mastozoologia, Departamento de Vertebrados, Museu Nacional, Universidade Federal do Rio de Janeiro, Quinta da Boa Vista, São Cristóvão, CEP: 20940-040, Rio de Janeiro, Brazil
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  • De Gruyter OnlineGoogle Scholar
/ Cibele R. Bonvicino
  • Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios, Instituto Oswaldo Cruz, Fiocruz, Av. Brasil, 4365, 21045-900, Rio de Janeiro, RJ, Brazil
  • Divisão de Genética, Instituto Nacional de Câncer, Rua André Cavalcante, 37, 4º andar, 20231-050, Rio de Janeiro, RJ, Brazil
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2017-02-23 | DOI: https://doi.org/10.1515/mammalia-2016-0131

Abstract

The spiny rat Trinomys, with ten endemic species in eastern Brazil, has a complex taxonomy. We carried out a revision of the karyotypes of Trinomys, described for the first time the karyotype of Trinomys paratus and performed the first phylogenetic analysis including all Trinomys species based on the mitochondrial cytochrome b gene. The T. paratus karyotype showed diploid number of 58 and fundamental autosomal number of 112. Diploid and fundamental autosomal numbers (FNa), and chromosomes’ morphology, are similar to those described for Trinomys eliasi. T. paratus appears as sister taxa of T. eliasi; in turn, this clade was recovered as the sister group of Trinomys setosus, as previously reported, confirming that sister species of Trinomys has conserved karyotypes, and suggesting that karyological evolution in this genus could be slower than species differentiation.

Keywords: C-band; morphology; phylogeny; spiny rat; Trinomys paratus

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About the article

Received: 2016-09-05

Accepted: 2017-01-10

Published Online: 2017-02-23

Published in Print: 2017-12-20


Citation Information: Mammalia, Volume 82, Issue 1, Pages 93–98, ISSN (Online) 1864-1547, ISSN (Print) 0025-1461, DOI: https://doi.org/10.1515/mammalia-2016-0131.

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