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Chromosomal characterization of two species of genus Steatogenys (Gymnotiformes: Rhamphichthyoidea: Steatogenini) from the Amazon basin: sex chromosomes and correlations with Gymnotiformes phylogeny
TLDR
The observations suggest that the ZZ/ZW system observed in S. elegans likely evolved through CH addition followed by a paracentric inversion, consistent with the phylogenetic hypothesis that tribe Steatogenini should be positioned within family Ramphychthyidae.
Chromosomal and electric signal diversity in three sympatric electric knifefish species (Gymnotus, Gymnotidae) from the Central Amazon Floodplain
TLDR
The evolutionary events that may have promoted signal divergence and reproductive isolation in Gymnotus of the Central Amazon are discussed, and the role that chromosomal rearrangements may place in diversification is discussed.
Comparative cytogenetics of two species of genus Scobinancistrus (Siluriformes, Loricariidae, Ancistrini) from the Xingu River, Brazil
TLDR
The karyotypic differences found between these two Scobinancistrus species can be used to identify them taxonomically, and may have functioned as a mechanism of post-zygotic reproductive isolation during the speciation process.
In Situ Localization of Ribosomal Sites in Peckoltia and Ancistomus (Loricariidae: Hypostominae) from the Amazon Basin.
TLDR
The aim of this work was to map 5S and 18S ribosomal (rDNA) sites in five species of Peckoltia and one species of Ancistomus from the Amazon basin, and discusses the mechanisms of organization and diversification of these clusters.
X1X1X2X2/X1X2Y sex chromosome systems in the Neotropical Gymnotiformes electric fish of the genus Brachyhypopomus
TLDR
Comparisons of these karyotypes and the evolutionary history of the taxa indicate independent origins for their sex chromosomes systems, and the recurrent emergence of the X1X1X2X2/X1 X2Y system may represent sex chromosomes turnover events in Gymnotiformes.
Chromosomal diversity in three species of electric fish (Apteronotidae, Gymnotiformes) from the Amazon Basin
TLDR
Cytogenetic studies were carried out on samples of Parapteronotus hasemani, Sternarchogiton preto and Sternarchorhamphus muelleri to help understanding the phylogenetic relationships and chromosomal evolution of the Apteronotidae.
Integrated Cytogenetic and Mitochondrial DNA Analyses Indicate That Two Different Phenotypes of Hypancistrus (L066 and L333) Belong to the Same Species.
TLDR
The data set indicates that worm-lined Hypancistrus from the Xingu form a single species with clear chromosomal and melanic pigment pattern polymorphisms.
The repetitive DNA element BncDNA, enriched in the B chromosome of the cichlid fish Astatotilapia latifasciata, transcribes a potentially noncoding RNA
TLDR
Bnc is a transcriptionally active repetitive DNA enriched in B chromosomes with potential action over B chromosome maintenance in somatic cells and meiotic drive in gametic cells.
B chromosomes of multiple species have intense evolutionary dynamics and accumulated genes related to important biological processes
TLDR
This study reveals the genomic structure, composition and function of Bs, which provide new insights for theories of B chromosome evolution, and detects unique sequences occurring exclusively on Bs and discovered various evolutionary patterns of genomic rearrangements associated to Bs.
De novo genome assembly of the cichlid fish Astatotilapia latifasciata reveals a higher level of genomic polymorphism and genes related to B chromosomes
Supernumerary B chromosomes (Bs) are accessory elements to the regular chromosome set (As) and have been observed in a huge diversity of eukaryotic species. Although extensively investigated, the
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