Ray-finned fish, the most diverse group of vertebrates, characterized by fins supported by bony rays rather than fleshy lobes. This group includes most familiar fish species from goldfish to tuna.
From Greek 'aktinos' meaning 'ray' and 'pterygion' meaning 'fin,' literally 'ray-finned.' The term was coined in the 19th century to distinguish these fish from lobe-finned fish based on their fin structure.
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