In silico Characterization of Satellitomes and Cross-Amplification of Putative satDNAs in Two Species of the Hypostomus ancistroides Complex (Siluriformes, Loricariidae).

Introduction: The mapping of the satellite DNA on chromosomes is vital to understanding the distribution and evolution of repetitions in the genome since these chromosomal studies have shown the origin, evolutionary mode, and function of repetitive sequences. This study aimed to prospect the satellitome and determine its location in the genome of two cryptic species of Hypostomus, H. aff.

The Persevering Cytotaxonomy: Discovery of a Unique XX/XY Sex Chromosome System in Catfishes Suggests the Existence of a New, Endemic and Rare Species.

The genus Hypostomus has a broad geographic distribution in Brazilian rivers and comprises armored catfishes with a very complicated taxonomy due to the absence of morphological autapomorphies. The existence of nearly 10 allopatric populations with different karyotypes suggests that Hypostomusancistroides represents a species complex in the Upper Paraná River basin. In this paper, an unusual karyotype of an isolated H.

Studies in two allopatric populations of (Steindachner, 1877): the role of mapping the ribosomal genes to understand the chromosome evolution of the group.

Several cytogenetic markers show chromosomal diversity in the fish such as "armoured catfish". Although studies have characterized many species in the major genera representing these Siluridae, particularly in the genus Lacépède, 1803, trends in chromosome evolution of this group remain unclear. The Paraíba do Sul river basin contains the armoured catfish Steindachner, 1877, which is unique because of its distribution of repetitive DNAs, the 5S and 18S rDNA.