Caracterização citogenética de Serrapinus microdon (Teleostei, Characidae, Cheirodontinae) da bacia do Sepotuba, Tangará da Serra-MT

• DOI: 10.22533/at.ed.1771920065

• Palavras-chave: AgRONs. Cromossomos sexuais. Heterocromatina constitutiva

• Keywords: AgRONs. Sexual Chromosomes. Constitutive Heterochromatin.

• Abstract:

  The subfamily Cheirodontinae

  is a group of fish still little studied from the

  cytogenetic point of view. The diminutive size

  of these lambaris presents as an important

  barrier in obtaining large quantity and quality

  of cells in metaphase. For the Paraguay River

  basin (which belongs to the Sepotuba River)

  there is the chromosomal description of four

  species of this subfamily, all also with 2n =

  52 chromosomes. In the development of this

  work, to obtain metaphase chromosomes and

  subsequent characterization of the karyotype

  macrostructure, the methodology proposed

  by Bertollo et al. (1978) and, later, treatments

  and staining of chromosome-specific regions

  with colloidal silver nitrate (Howell, Black,

  1980). Satisfactory results were obtained in 14

  individuals, nine females, two males and three

  with unidentified sex. After the elaboration of

  the karyotypes, there was a slight divergence

  between that presented by females and males.

  The analysis of nucleoli organizing regions

  seems to be associated with the dimorphism

  observed in the conventional Giemsa staining.

• Número de páginas: 15