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|Noun||1.||subclass Dipnoi - bony fishes of the southern hemisphere that breathe by a modified air bladder as well as gills; sometimes classified as an order of Crossopterygii|
class Osteichthyes, Osteichthyes - a class of fish having a skeleton composed of bone in addition to cartilage
lungfish - air-breathing fish having an elongated body and fleshy paired fins; certain species construct mucus-lined mud coverings in which to survive drought
class - (biology) a taxonomic group containing one or more orders