Abstract
Auchenipteridae is divided in two subfamilies, Centromochlinae and Auchenipterinae. Centromochlinae has 31 valid species, from which 13 are included in the genus Tatia Miranda Ribeiro, 1911. Among these, Tatia jaracatia Pavanelli & Bifi, 2009 and Tatia neivai (Ihering, 1930) are the only two representative species from the Paraná-Paraguay basins. This study aimed to analyze cytogenetically these two species and thus provide the first chromosomal data for the genus. Although Tatia jaracatia and Tatia neivai presented 2n=58 chromosomes, some differences were observed in the karyotypic formula. The heterochromatin was dispersed in the centromeric and terminal regions of most chromosomes of Tatia jaracatia, and only in the terminal region of most chromosomes of Tatia neivai. The AgNORs were detected in the subtelocentric pair 28 for both species, which was confirmed by FISH with 18S rDNA probe. The 5S rDNA sites were detected in four chromosome pairs in Tatia jaracatia and three chromosome pairs in Tatia neivai. Both species of Tatia presented great chromosomal similarities among themselves; however, when compared to other species of Auchenipteridae, it was possible to identify some differences in the karyotype macrostructure, in the heterochromatin distribution pattern and in the number and position of 5S rDNA sites, which until now seems to be intrinsic to the genus Tatia.
Highlights
Among the Siluriformes, Auchenipteridae comprises a fish group endemic to the Neotropical region
A new species was described for this genus, Tatia jaracatia Pavanelli et Bifi, 2009, which is endemic to the Iguaçu River, a tributary of the Paraná River basin (Pavanelli and Bifi 2009)
The 5S rDNA sites were detected in 4 chromosome pairs, on the short arm in interstitial position of the metacentric pair 4, on the short arm in terminal position of the submetacentric pairs and 29, and on the long arm in interstitial position of the submetacentric pair (Fig. 2)
Summary
Among the Siluriformes, Auchenipteridae comprises a fish group endemic to the Neotropical region. Most of the Auchenipteridae genera belong to the subfamily Auchenipterinae, with only Centromochlus Kner, 1857, Gelanoglanis Böhlke, 1980, Tatia Miranda Ribeiro, 1911 and Glanidium Lütken, 1874 allocated in Centromochlinae (Soares-Porto 1998). The subfamily Centromochlinae has 31 valid species (Ferraris Jr 2007), and in a revision of the genus, 12 species are described of Tatia (Sarmento-Soares and Martins-Pinheiro 2008). After this revision, a new species was described for this genus, Tatia jaracatia Pavanelli et Bifi, 2009, which is endemic to the Iguaçu River, a tributary of the Paraná River basin (Pavanelli and Bifi 2009)
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