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Genetica

, Volume 125, Issue 2–3, pp 125–132 | Cite as

Chromosome Banding and 18S rDNA in situ Hybridization Analysis of Seven Species of the Family Achiridae (Teleostei: Pleuronectiformes)

  • Marisa Fagundes Carvalho de Azevedo
  • Claudio Oliveira
  • Belén G. Pardo
  • Paulino Martínez
  • Fausto Foresti
Article

Abstract

Achiridae is an important family of the order Pleuronectiformes widely distributed in North, Central, and South America with freshwater and marine species. In the present study cytogenetic analyses comprising conventional and molecular techniques were carried out in seven species of this family. The following diploid numbers (2n) and fundamental numbers (FN) were obtained: Achirus declivis 2n = 34, FN  = 52; Achirus lineatus 2n = 40, FN  = 66; Catathyridium jenynsi 2n = 40 and FN  = 50; Gymnachirus nudus 2n = 36 and FN  = 50; Hypoclinemus mentalis 2n = 38 and FN  = 54; Trinectes paulistanus 2n = 42 and FN  = 52; and Trinectes sp. 2n = 38 and FN  = 54. All species presented a single nucleolar organizer region (NOR) bearing chromosome pair and C-band positive segments mainly distributed at the pericentromeric position. The wide variation observed in chromosome number and FN suggests the occurrence of larger chromosome rearrangements in the family Achiridae if compared with other families of the same order.

Keywords

C-band Chromomycin A3 in situ hybridization karyotypic evolution nucleolar organizer region Pleuronectiformes 

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Copyright information

© Springer 2005

Authors and Affiliations

  • Marisa Fagundes Carvalho de Azevedo
    • 1
  • Claudio Oliveira
    • 1
  • Belén G. Pardo
    • 2
  • Paulino Martínez
    • 2
  • Fausto Foresti
    • 1
  1. 1.Departamento de Morfologia, Laboratório de Biologia e Genética de Peixes. Instituto de BiociênciasUniversidade Estadual Paulista-UNESPBotucatuBrazil
  2. 2.Laboratório de Genética. Faculdade de Veteri-nariaUniversidad de Santiago de CompostelaLugoSpain

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