Simple Summary For more than a century, B chromosomes have been investigated in
several eukaryotic species. These supernumerary genomic elements behave as parasites or …

In this study, a new species of Moenkhausia is described from the upper rio Juruena, rio
Tapajós basin, Brazil. It is distinguished from all congeners by the presence of minute bony …

B chromosomes occur in different species of the small characid fishes of the genus
Moenkhausia. These supernumerary elements, that do not recombine with chromosomes of …

Background The main cytogenetic studies of the Characidae family comprise the genera
Astyanax and Psalidodon involving the use of repetitive DNA probes. However, for the …

Trachelyopterus is a Neotropical catfish genus with a controversial taxonomic history due to
the morphological similarity among species. Cytogenetically, only classic techniques …

Moenkhausia is a highly specious genus among the Characidae, composed of 96 valid
species. Only twelve species have a known karyotype. Thus, here are presented the first …

Tetragonopterus is a taxonomically complex genus in Characidae, being currently
represented by nine species according to integrative approaches. One of them, T …

Moenkhausia Eigenmann, 1903 is one of the most diverse genera within Characidae, being
an important component of the Neotropical fish fauna. Three members of this genus were …

B chromosomes are extra-genomic components of cells found in individuals and in
populations of some eukaryotic organisms. They have been described since the first …