Subset of the ichthyofauna of the Ceará-Mirim River basin, Rio Grande do Norte State, Brazil. A Leporinus piau B Serrapinnus piaba C Trachelyopterus galeatus D Sciades herzbergii E Hypostomus pusarum F Kryptolebias hermaphroditus G Cichlasoma orientale H Guavina guavina I Gobionellus oceanicus.