Cytogenetic description of Ancistrus abilhoai (Siluriformes: Loricariidae) from Iguaçu River basin, southern Brazil

The Iguacu River basin is a tributary to the upper Parana River in southern Brazil, and is considered an important aquatic ecoregion that, although having few species of fish, 51-71% of these are apparently endemic. Ancistrus abilhoai is one of three recently described species for this basin and is currently considered endemic to the basin. In this study, we present the chromosomal structure of two populations of Ancistrus abilhoai one collected in the Iguacu River, in Parana State, and another collected in the Timbo River, a tributary of the Iguacu River, in the State of Santa Catarina. Karyotype analyzes were performed in 11 specimens from the Iguacu River (four females and seven males) and 12 specimens (all males)