Heteropneustidae
From The Aquarium Wiki
Heteropneustidae, or the Airsac Catfish, is a very small family of catfish belonging to the order Siluriformes. There are a mere 4 known species in this family and their pectoral fin is associated with a poison gland dangerous to humans. They all have a long air sac that serves as a lung which extends backwards from the gill chamber.
