"Fish" phylogeny has been studied using partial 28 S ribosomal RNA sequences of 14 species among which 12 are "fish" ranging from lamprey to perciforms. Our results are in good agreement with generally accepted cladograms based on anatomical and paleontological data. Two interesting conclusions emerged: a) Polypterus is the sister-group of all other actinopterygians; b) the divergences of the Clasdistia, Tetrapoda and Chondrichthyes seem to have occurred during a relatively short period of time.
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