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Karyotype description of possible new species of the Hypostomus ancistroides complex (Teleostei: Loricariidae) and other Hypostominae - doi: 10.4025/actascibiolsci.v34i2.9318
Sayuri Endo, Kátia; Ricardo Monteiro Martinez, Emanuel; Henrique Zawadzki, Claudio; Ricardo de Souza Paiva, Luiz; Ferreira Júlio Júnior, Horácio.
  • Sayuri Endo, Kátia; s.af
  • Ricardo Monteiro Martinez, Emanuel; s.af
  • Henrique Zawadzki, Claudio; s.af
  • Ricardo de Souza Paiva, Luiz; s.af
  • Ferreira Júlio Júnior, Horácio; s.af
Acta sci., Biol. sci ; 34(2): 181-189, Apr.-June 2012.
Article Dans Portugais | LILACS-Express | LILACS, VETINDEX | ID: biblio-1460710
RESUMO
Cytogenetic analyses were performed in four species of the Hypostominae subfamily, three from Hypostomus (Hypostomini) genus and Rhinelepis aspera (Rhinelepini). Three populations of Hypostomus ancistroides were analyzed, which had 2n=68 chromosomes, but presented different karyotype formulas. Hypostomus regani and H. strigaticeps, both from Ivaí river, showed 2n=72 chromosomes with two distinct cytotypes. In turn, R. aspera of the upper Paraná river basin presented 2n=54 chromosome. Multiple Nucleolar Organizer Regions (NORs) have been evidenced by silver nitrate staining in species of Hypostomus and single NOR in R. aspera. The observed variation in the chromosome number and the marked variability in karyotype formulas and NORs reveal a certain amount of karyotype variation in the genus Hypostomus suggesting the probable existence of cryptic species with independent chromosome traits. Therefore, our data can be of great value in discriminating species and understanding their chromosomal evolution.

Texte intégral: Disponible Indice: LILAS (Amériques) langue: Portugais Texte intégral: Acta sci., Biol. sci Année: 2012 Type: Article

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Texte intégral: Disponible Indice: LILAS (Amériques) langue: Portugais Texte intégral: Acta sci., Biol. sci Année: 2012 Type: Article