The Rhipidistia are a clade of lobe-finned fishes which include the Tetrapods and lungfishes. Taxonomists traditionally considered the Rhipidistia a subgroup of Crossopterygii that described a group of fish that lived during the Devonian consisting of the Porolepiformes and Osteolepiformes. However as cladistic understanding of the vertebrates has...
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http://en.wikipedia.org/wiki/Rhipidistia
extinct group of lobe-finned bony fishes of the order Crossopterygii that included the ancestors of amphibians and the other terrestrial vertebrates. ... [3 related articles]
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http://www.britannica.com/eb/a-z/r/43
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