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The South American lungfish is most closely related to the African lungfishes (family Protopteridae), and both families are thought to have diverged during the Early Cretaceous. Some papers suggest classifying both Lepidosiren and Protopterus within Lepidosirenidae, though authorities continue to classify both as distinct families. [9] [10] [11]
South American lungfish. The South American lungfish, Lepidosiren paradoxa, is the single species of lungfish found in swamps and slow-moving waters of the Amazon, Paraguay, and lower Paraná River basins in South America. Notable as an obligate air-breather, it is the sole member of its family native to the Americas.
All members of the order are obligatory air-breathers; only the Australian lungfish has functioning gills when adult; members of the Lepidosirenidae have gills only when they are larvae. [5] The South American and African lungfish also all have generally small scales and two lungs as opposed to the Australian lungfish's single lung. [5]
The South American lungfish reaches up to about 4 feet (1.25 meters) long. While other fish rely upon gills to breathe, lungfish also possess a pair of lung-like organs.
A freshwater aquatic food web. The blue arrows show a complete food chain (algae → daphnia → gizzard shad → largemouth bass → great blue heron). A food web is the natural interconnection of food chains and a graphical representation of what-eats-what in an ecological community.
Neoceratodus is a genus of lungfish in the family Neoceratodontidae.The extant Australian lungfish (Neoceratodus forsteri) is the only surviving member of this genus, but it was formerly much more widespread, being distributed throughout Africa, Australia, and South America. [1]
The Gnathorhizidae are an extinct family of lungfish that lived from the late Carboniferous until the middle Triassic. Gnathorhizid fossils have been found in North America, Madagascar, Australia, and possibly Eastern Europe and South Africa. They are characterized by high-ridged toothplates that form cutting blades and a reduction in cranial ...
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