2008
DOI: 10.1590/s1415-47572008000200008 View full text |Buy / Rent full text
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Abstract: Two Siluriformes species endemic to the São Francisco River basin were characterized by conventional and differential cytogenetic analyses involving C-banding, Ag-nucleolar organizer region (NOR) and chromomycin A 3 (CMA 3 ) staining, and FISH (fluorescent in situ hybridization) with 18S and 5S rDNA probes. Conorhynchus conirostris presents a higher diploid number (2n = 60) than those detected in Pimelodidae representatives, whereas Lophiosilurus alexandri, with a karyotype of 2n = 54 chromosomes, presents a c… Show more

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“…Although the number of chromosomes found in H. mustelinus is within the variation observed in Heptapteridae (42-58 chromosomes), the diploid number of 54 chromosomes found in this study differs from all data on the species of Heptapteridae analysed to date. This diploid number, however, has been found in species of the Pseudopimelodidae family (Vissotto et al, 1999a;Marques et al, 2008;Martinez et al, 2008), which, just as Heptapteridae, was already considered a subfamily in Pimelodidae (Pinna, 1998). In addition, Lundberg et al (1991) suggested a sister group relationship between the Heptapteridae and Pseudopimelodidae families based on the structure of the lower lip.…”
Section: Discussionmentioning
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“…Although the number of chromosomes found in H. mustelinus is within the variation observed in Heptapteridae (42-58 chromosomes), the diploid number of 54 chromosomes found in this study differs from all data on the species of Heptapteridae analysed to date. This diploid number, however, has been found in species of the Pseudopimelodidae family (Vissotto et al, 1999a;Marques et al, 2008;Martinez et al, 2008), which, just as Heptapteridae, was already considered a subfamily in Pimelodidae (Pinna, 1998). In addition, Lundberg et al (1991) suggested a sister group relationship between the Heptapteridae and Pseudopimelodidae families based on the structure of the lower lip.…”
Section: Discussionmentioning
“…Considering these data together with those presented in this study, location of 5S In Pseudopimelodidae family, data about 5S rDNA location are even scarcer, hindering a comparative analysis. This site had only been evidenced in Lophiosilurus alexandri, located in the terminal region on a pair of subtelocentric chromosomes (Marques et al 2008). Conversely, it had been observed in Microglanis cottoides, located in interstitial region.…”
Section: Discussionmentioning
“…In the Pseudopimelodidae family, which has a close phylogenetic relationship with Heptapteridae, hybridization data are even scarcer (Gouveia et al 2015). The location of 5S rDNA sites are known only in Lophiosilurus alexandri Steindachner, 1877, evidenced in the terminal region of a pair of subtelocentric chromosome (Marques et al 2008).…”
Section: Introductionmentioning
“…Endemismos ao longo das bacias hidrográficas brasileiras vêm se mostrando um fenômeno comum, sendo amplamente disperso em grupos de peixes, principalmente devido à vicariância ou dispersão (MARQUES et al, 2008). Análises citogenéticas realizadas em Characiformes e Anguilliformes Neotropicais BERTOLLO, 1991;BERTOLLO et al, 2000;TORRES et al, 2005) têm revelado diversos complexos de espécies.…”
Section: Introductionunclassified
“…O bagre dulcícola, Parauchenipterus galeatus, que exibe ampla distribuição na América do Sul, constituí um típico representante da ictiofauna neotropical de Siluriformes, popularmente conhecido como cangati. Ocorre geralmente nas áreas de matas alagadas e sob vegetação aquática flutuante, possuindo hábitos noturnos (MEDEIROS et al, 2003). Possui peculiaridades em relação ao seu modo de reprodução, apresentando fertilização interna e dimorfismo sexual marcante, o qual nos machos é mais evidente devido à modificação de seu primeiro raio da nadadeira anal em um órgão intromitente.…”
Section: Introductionunclassified