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Introduction to the Actinopterygii
https://ucmp.berkeley.edu/vertebrates/actinopterygii/actinintro.html
“Click on this image to view a larger version! This brilliant, spiny, and poisonous lionfish is just one of the world's 20,000 living species of actinopterygians. The name means "ray-finned," for unlike the Chondrichthyes, the fins of the Actinopterygii are webs of skin supported by bony or horny...” (from the page’s text)
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