Trairão? H. lacerdae ou H. argentinensis
Serrasalmus marginatus y S. maculatus
This specimen was collected during an expedition to poorly sampled areas of the upper Paraná River basin, in its western portion. This is the first record of this species outside the Paraguay River basin and a manuscript documenting this distribution was submitted and accepted for publication in CheckList, a journal that documents geographic distribution notes. The individual in this observation was deposited in the Três Lagoas Ictiological Collection and its identification was confirmed by six ichthyologists, including Luiz Tencatt and Cláudio Zawadzki, who described this species in 2014.