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What are Ray-finned Fish? Ray-finned fish (Actinopterygii) are the dominant aquatic vertebrates today. They illustrate great diversity in their morphology and habitats, living in shallow to deep and freshwater to marine habitats. Their name comes from the presence of “rays,” fine bony or horny spines that support the webbing of their fins. Trout, salmon, bass, and tuna are typical modern ray-finned fish.
First known fossil occurrence: Devonian.
Last known fossil occurrence: Quaternary. This group has living relatives.
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