Uruguay River
"Steindachneridion" species originate from South America and are restricted to eastern Brazilian coastal drainages, plus the upper Paraná and Uruguay River basins. "S. amblyurus" originates from the Jequitinhonha River basin. "S. doceanum" originates from the Doce River basin. "S. melanodermatum" originates from Iguaçu River in Brazil. "S. parahybae" originates from Paraíba do Sul and Jequitinhonha River basins. "S. punctatum" originates from the upper Paraná River and the Uruguay River basins. "S. scriptum" originates from the Uruguay River.