WAgamyxis pectinifrons
WAgeneiosus ucayalensis
WAmazon leaffish
WAuchenipterichthys
WBoulengerella cuvieri
WBunocephalus coracoideus
WEmerald catfish
WGilded catfish
WPorthole shovelnose catfish
WRedtail catfish
WSpiny catfish
WFirewood catfish
WCetopsidae
WCetopsis
WCrenicichla johanna
WEntomocorus benjamini
WFarlowella nattereri
WHemiodontichthys
WMegalechis picta
WMegalechis thoracata
WMegalodoras uranoscopus
WMetynnis hypsauchen
WNannostomus trifasciatus
WNannostomus unifasciatus
WNemadoras humeralis
WOcellate river stingray
WOnesided livebearer
WOpsodoras stuebelii
WOrestias (fish)
WOxydoras niger
WParatrygon
WPencil fish
WPinirampus
WPotamotrygon falkneri
WPseudoplatystoma punctifer
WPseudoplatystoma tigrinum
WSalminus brasiliensis
WSteatogenys elegans
WTiticaca orestias
WTrachydoras microstomus
WTrachydoras paraguayensis
WTrichomycterus rivulatus