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ZZ/ZW sex chromosome system in an undescribed species of the genus <i>Apareiodon </i>(Characiformes, Parodontidae)

2006; Karger Publishers; Volume: 114; Issue: 2 Linguagem: Inglês

10.1159/000093333

1424-8581

Marcelo Ricardo Vicari, Orlando Moreira‐Filho, Roberto Ferreira Artoni, Luiz Antônio Carlos Bertollo,

Fish biology, ecology, and behavior

The chromosomes of an undescribed species of the genus <i>Apareiodon</i> (Characiformes, Parodontidae) from the Verde River, a headwater affluent of the Tibagi River (Paraná State, Brazil), were investigated using conventional Giemsa and Ag stainings, C-banding, CMA₃ fluorescence and fluorescent in situ hybridization (FISH) using 18S and 5S rDNA probes. The diploid chromosome number was 2n = 54, with the karyotype composed of 48 meta/submetacentric and six subtelocentric chromosomes in males, and 47 meta/submetacentric + seven subtelocentric chromosomes in females. The difference is hypothesized to be due to a ZZ/ZW heteromorphic sex chromosome system, a cytotaxonomic characteristic previously observed only in some species of the genus <i>Parodon</i> (family Parodontidae). The presence of similar and/or identical heteromorphic sex chromosome systems might suggest that species of the genera <i>Parodon</i> and <i>Apareiodon</i> bearing ZZ/ZW heteromorphic sex chromosomes likely constitute a monophyletic group, a hypothesis to be tested by a robust phylogeny of the family.