Genetica

, 130:99

The karyotypes of the thorny catfishes Wertheimeria maculata Steindachner, 1877 and Hassar wilderi Kindle, 1895 (Siluriformes: Doradidae) and their relevance in doradids chromosomal evolution

  • Eduardo S. Eler
  • Jorge A. Dergam
  • Paulo C. Vênere
  • Lílian C. Paiva
  • Gabriela A. Miranda
  • Alessandro A. Oliveira
Brief Report

DOI: 10.1007/s10709-006-0023-4

Cite this article as:
Eler, E.S., Dergam, J.A., Vênere, P.C. et al. Genetica (2007) 130: 99. doi:10.1007/s10709-006-0023-4

Abstract

We studied the karyotypes of two doradids, the rare and endangered Wertheimeria maculata and a derived Amazonian species, Hassar wilderi. Cytogenetic characterization was assessed using conventional staining (Giemsa), C-banding, and NOR banding. Both species had 2n = 58 chromosomes but differed in their chromosome formulae, 24 m + 14sm + 8st + 12a for W. maculata and 32 m + 16sm + 10st for H. wilderi. In W. maculata heterochromatin was mainly telomeric, and three chromosomes had a fully heterochromatic arm; in H. wilderi heterochromatin was also predominantly telomeric and evident in many more chromosomes. Hassar wilderi also presented one pair of homologues with a fully heterochromatic arm. In both species, nucleolar organizer regions were restricted to one pair of subtelocentric chromosomes. Assuming a basal position for W. maculata, we hypothesized that underlying conserved diploid and NOR-bearing chromosome numbers, chromosomal evolution in doradids has involved pericentric inversions and an increase of heterochromatic blocks.

Keywords

Brazilian coastal basins Conservation genetics Cytotaxonomy South American biodiversity 

Copyright information

© Springer Science+Business Media B.V. 2006

Authors and Affiliations

  • Eduardo S. Eler
    • 1
  • Jorge A. Dergam
    • 2
  • Paulo C. Vênere
    • 3
  • Lílian C. Paiva
    • 2
  • Gabriela A. Miranda
    • 2
  • Alessandro A. Oliveira
    • 2
  1. 1.Genética, Conservação e Biologia Evolutiva – Instituto Nacional de Pesquisas da AmazôniaManausBrazil
  2. 2.Departamento de Biologia AnimalUniversidade Federal de ViçosaViçosaBrazil
  3. 3.Departamento de Ciências Biológicas e da SaúdeInstituto de Ciências e Letras do Médio Araguaia, Universidade Federal de Mato GrossoPontal do AraguaiaBrazil

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