Any fish belonging to the Dipnoi; -- so called because they have both lungs and gills.

air-breathing fish having an elongated body and fleshy paired fins; certain species construct mucus-lined mud coverings in which to survive drought

A family of fishes having both gills and lungs.

A type of lobe-finned fish that breathe by a modified swim bladder (or lung) as well as by gills.

Lungfishes are sarcopterygian fish belonging to the order Dipnoi. Lungfish are best-known for retaining characteristics primitive within the Osteichthyes, including the ability to breathe air, and structures primitive within Sarcopterygii, including the presence of lobed fins with a well-developed internal skeleton. Today, they live only in Africa, South America, and Australia.