fish family - any of various families of fish

Dipnoi, 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

genus Ceratodus - type genus of the Ceratodontidae: extinct genus of lungfishes

genus Neoceratodus, Neoceratodus - extant Australian lungfishes