Chromosomal Diversification in Species (Loricariidae, Hypostominae) Revealed by Comparative Mapping of Repetitive Sequences.

is a genus of Neotropical fish with eight valid species, in addition to numerous lineages not formally identified. It occurs along the Amazon and Tocantins River basins, in Suriname and in the Guiana shield. There are no karyotypic data in the literature for species of this genus.

Chromosomal Diversification in Species (Siluriformes: Loricariidae) Inferred From Repetitive Sequence Analysis.

The genus has extensive chromosomal diversity among species, including heteromorphic sex chromosomes occurrence. However, studies have been shown that chromosomal diversity may still be underestimated. Repetitive sequences represent a large part of eukaryotic genomes, associated with mechanisms of karyotypic diversification, including sex chromosomes evolution.

(Gymnotiformes, Teleostei): First insights into karyotype and repetitive DNA distribution in two populations of the Amazon.

, one of the five genera of Neotropical freshwater fish of the family Sternopygidae (Gymnotiformes), was long considered a monotypic genus represented by . Currently, it consists of six species, most of them occurring in the Amazon region. There are no cytogenetic data for species of this genus.

Comparative Cytogenetics Analysis Among Species (Siluriformes, Loricariidae): Insights on Karyotype Evolution and Biogeography in the Amazon Region.

is widely distributed genus in the Amazon and Orinoco basins and the Guiana Shield, containing 18 valid species, and distinct morphotypes still needing description in the scientific literature due to its great taxonomic complexity. This study performed a comparative chromosomal analysis of two undescribed species ( sp. 3 Jarumã and sp.

Karyotypic diversity within the genus Makalata (Echimyidae: Echimyinae) of Brazilian Amazon: Chromosomal evidence for multiple species.

The genus Makalata is a taxonomically complex group of rodents on which few cytogenetic studies have been performed. Most of the published karyotypes were described based only on conventional chromosome staining. Here, we studied the karyotypes of Makalata from two Brazilian Amazonian states, Amapá and Pará, by Giemsa-staining, G- and C-banding, AgNO3-staining and FISH with 18S rDNA and telomeric sequences probes.