Bemis, William Formerly, Zoology Department, University of Massachusetts, Amherst, Massachusetts.
Boschung, Herbert T. Department of Biological Sciences, University of Alabama, Tuscaloosa, Alabama.
Schultze, Hans-Peter Museum of Natural History, University of Kansas, Lawrence, Kansas.
Last reviewed:December 2019
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A fish subclass (class Sarcopterygii of the Osteichthyes) consisting of the lungfishes, which have lungs that arise from a ventral connection in the gut; also called Dipneusti. The subclass Dipnoi comprises the lungfishes, which are lobe-finned fishes (sarcopterygians) and contains two orders: Ceratodontiformes, consisting of one extant species of Australian lungfish in the family Ceratodontidae; and Lepidosireniformes, consisting of one extant species of South American lungfish in the family Lepidosirenidae and four extant species of African lungfishes in the family Protopteridae. There are also numerous extinct taxa known only from fossils, with some extinct members being marine species; modern forms are all inhabitants of freshwater. See also: Fossil; Osteichthyes; Sarcopterygii
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