Karyotype description of possible new species of the Hypostomus ancistroides complex (Teleostei: Loricariidae) and other Hypostominae - doi: 10.4025/actascibiolsci.v34i2.9318

Kátia Sayuri Endo; Emanuel Ricardo Monteiro Martinez; Claudio Henrique Zawadzki; Luiz Ricardo de Souza Paiva; Horácio Ferreira Júlio Júnior

doi:10.4025/actascibiolsci.v34i2.9318

**Karyotype description of possible new species of the Hypostomus ancistroides complex (Teleostei: Loricariidae) and other Hypostominae** - doi: 10.4025/actascibiolsci.v34i2.9318

Authors

Kátia Sayuri Endo Universidade Estadual de Maringá Author
Emanuel Ricardo Monteiro Martinez Universidade Estadual Paulista “Júlio de Mesquita Filho" / Botucatu-SP Author
Claudio Henrique Zawadzki Universidade Estadual de Maringa Author
Luiz Ricardo de Souza Paiva Universidade Estadual Paulista “Júlio de Mesquita Filho" / Botucatu-SP Author
Horácio Ferreira Júlio Júnior Universidade Estadual de Maringá Author

DOI:

https://doi.org/10.4025/actascibiolsci.v34i2.9318

Keywords:

chromosomal evolution, cryptic species, Neotropical fishes, NOR

Abstract

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.

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Author Biography

Claudio Henrique Zawadzki, Universidade Estadual de Maringa

Graduação em Ciências Biológicas pela Universidade Estadual de Maringá (1993), mestrado em Ecologia de Ambientes Aquáticos Continentais pela Universidade Estadual de Maringá (1996) e doutorado em Ecologia de Ambientes Aquáticos Continentais pela Universidade Estadual de Maringá (2001). Lecionei Genética Molecular na Universidade Estadual do Centro-Oeste. Atualmente sou professor adjunto da área de Zoologia na Universidade Estadual de Maringá. Tenho experiência na área de Zoologia, com ênfase em Taxonomia de Espécies de peixes da família Loricariidae, atuo principalmente nos seguintes temas: aloenzimas, Hypostomus, Loricariidae, peixes, taxonomia, variabilidade genética. Sou credenciado ao curso de Pós-Graduação em Biologia Evolutiva da Universidade Estaudal do Centro-Oeste, com linha de pesquisa em Ecologia de Vertebrados.

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Published

2011-10-21

Issue

Vol. 34 No. 2 (2012)

Section

Genetics

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How to Cite

Karyotype description of possible new species of the Hypostomus ancistroides complex (Teleostei: Loricariidae) and other Hypostominae - doi: 10.4025/actascibiolsci.v34i2.9318. (2011). Acta Scientiarum. Biological Sciences, 34(2), 181-189. https://doi.org/10.4025/actascibiolsci.v34i2.9318