WAriidae
WAriopsis (fish)
WBagre (fish)
WBagre (fish)
WBatrachocephalus
WBlacktip sea catfish
WBlue sea catfish
WBox sea catfish
WCathorops
WCathorops arenatus
WCathorops belizensis
WCathorops dasycephalus
WCathorops fuerthii
WCathorops higuchii
WCathorops hypophthalmus
WCathorops mapale
WCathorops taylori
WCathorops tuyra
WCathorops wayuu
WCephalocassis
WEngraved catfish
WEstuarine sea catfish
WFreckled sea catfish
WGaleichthys
WGaleichthys feliceps
WGenidens
WGiant catfish
WGuri sea catfish
WHardhead catfish
WHemiarius
WHexanematichthys
WKetengus
WKetengus
WLacandon sea catfish
WLepidophagy
WNemapteryx
WNemapteryx nenga
WNetuma
WNotarius (fish)
WOccidentarius platypogon
WOccidentarius platypogon
WOsteogeneiosus
WOsteogeneiosus
WPassany sea catfish
WPemecou sea catfish
WPlicofollis
WPotamarius
WQarmoutus
WRiver catfish
WSagor catfish
WSciades
WSona sea catfish
WSteindachner's sea catfish
WTete sea catfish
WWhite sea catfish