2004
DOI: 10.1590/s1679-62252004000300003
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Cytotaxonomic diagnosis of Trichomycterus diabolus (Teleostei: Trichomycteridae) with comments about its evolutionary relationships with co-generic species

Abstract: The karyotype and the Ag-NOR location of a sample of Trichomycterus diabolus collected in the córrego Hortelã (Botucatu, São Paulo, Brazil) are described. The species exhibited 2n=56 chromosomes (42 metacentrics, 12 submetacentrics and 2 subtelocentrics) and the nucleolus organizing region located near to the centromere on the long arm of the largest metacentric pair. The presence of 2n=56 chromosomes in T. diabolus is an interesting characteristic since until now all cis-Andean species karyotyped presented 2n… Show more

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Cited by 5 publications
(5 citation statements)
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“…Variable karyotypes associated with vicariant processes and putative speciation have been described for other Neotropical fish groups (Torres et al . 1998, 2004a; Jorge and Moreira‐Filho 2000; Centofante et al . 2003; Bertollo et al .…”
Section: Discussionmentioning
confidence: 99%
“…Variable karyotypes associated with vicariant processes and putative speciation have been described for other Neotropical fish groups (Torres et al . 1998, 2004a; Jorge and Moreira‐Filho 2000; Centofante et al . 2003; Bertollo et al .…”
Section: Discussionmentioning
confidence: 99%
“…Contrarily, striking differences in the chromosome formula as well as the number and location of ribosomal cistrons have been documented by comparing samples from the southern and southeastern coastal plains with those native to Iguaçu headwaters (Guimarães et al, 1995;Torres et al, 2008). It is presumed that variations in the number and location of ribosomal cistrons (nucleolar organizer regions-NORs) are diagnostic markers for species level (Galetti et al, 1984;Amemyia & Gold, 1988;Venere & Galetti, 1989;Torres et al, 1998Torres et al, , 2004a.…”
Section: Introductionmentioning
confidence: 99%
“…However, comparing our results with available cytogenetic data for this group, one must note that remarkable differences in the karyotypic formulae are evident, mainly related to the number of meta-and submetacentric chromosomes in each species or even within a single species (Torres et al, 2004;Vicari et al, 2010).…”
Section: Discussionmentioning
confidence: 70%
“…to 2n=62 in T. laucaensis (Arratia & Veloso, 1980). Remarkably, Sato et al (2004) stated that such notable differences might be found only in transAndean species, while cis-Andean species have retained a conserved diploid number of 54 chromosomes, except T. diabolus from Tietê River, which has been described with 2n=56 chromosomes (Torres et al, 2004). In addition, variations in the chromosomal location of the nucleolar organizer regions (NORs) and even the occurrence of supernumerary chromosomes were already reported in this group (Borin & Martins-Santos, 2000;Torres et al, 2002).…”
Section: Introductionmentioning
confidence: 93%