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Chromosome analyses in species of Pareiorhina (Siluriformes, Loricariidae) and cytotaxonomic considerations on the group

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Abstract

The genus Pareiorhina, formerly considered monotypic, was recently described to comprise two new species P. carrancas and P. brachyrhyncha. Karyotype analysis allowed to infer cytotaxonomical diagnostic characters for P. rudolphi and P. brachyrhyncha in the present study. The species showed the same diploid number (2n = 54) and karyotypes with 18 m, 32sm, 4st and 18 m, 30sm, 6st chromosomes, respectively. In addition, we found that the nucleolus organizer regions (NORs) are located on different chromosomes. Localization of NORs has been ascertained by fluorescent in situ hybridization (FISH) and colloidal silver nitrate stain (Ag-NORs). P. rudolphi shows NORs in interstitial position of the long arm of chromosome pair number 11, while P. brachyrhyncha shows subterminal NORs only in the short arm of chromosome pair 25. Occurrence of diploid chromosome number and presence of only one pair of NOR bearing chromosomes makes these species to comprised of most plesiomorphic karyotype of Loricariidae and supports its clustering with the genus Neoplecostomus. The chromosome types and diversification in the location of NORs corroborate the description of the species P. brachyrhyncha.

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Acknowledgements

The authors are grateful to IBAMA/MMA/SISBIO (Instituto Brasileiro do Meio Ambiente e Recursos Naturais Renováveis) for authorizing the specimens captures. This work was supported by FAPESP (Fundação de Amparo à Pesquisa do Estado de São Paulo), CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico, CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior), FAPEMAT (Fundação de Amparo a Pesquisa do Estado do Mato Grosso) and Fundação Araucária (Fundação Araucária de Apoio ao Desenvolvimento Científico e Tecnológico do Estado do Paraná).

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Authors and Affiliations

  1. Programa de Pós-Graduação em Genética e Evolução, Universidade Federal de São Carlos, Via Washington Luiz, km 235, 13565-905, São Carlos, SP, Brazil

    Liano Centofante, Luiz Antonio Carlos Bertollo & Orlando Moreira-Filho

  2. Departamento de Biologia Estrutural, Molecular e Genética, Universidade Estadual de Ponta Grossa, Av. Carlos Cavalcanti 4748, CEP 84030-900, Ponta Grossa, Paraná, Brazil

    Marcelo Ricardo Vicari & Roberto Ferreira Artoni

  3. Departamento de Vertebrados, Museu Nacional, Quinta da Boa Vista, 20940-040, Rio de Janeiro, RJ, Brazil

    Paulo Andreas Buckup

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  1. Liano Centofante
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  2. Marcelo Ricardo Vicari
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  3. Roberto Ferreira Artoni
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  4. Paulo Andreas Buckup
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  5. Luiz Antonio Carlos Bertollo
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  6. Orlando Moreira-Filho
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Correspondence to Roberto Ferreira Artoni.

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Centofante, L., Vicari, M.R., Artoni, R.F. et al. Chromosome analyses in species of Pareiorhina (Siluriformes, Loricariidae) and cytotaxonomic considerations on the group. Nucleus 54, 65–70 (2011). https://doi.org/10.1007/s13237-011-0035-z

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