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Introduction to the Chondrichthyes
https://ucmp.berkeley.edu/vertebrates/basalfish/chondrintro.html
“Sharks, skates, rays, and even stranger fish make up the Chondrichthyes, or "cartilaginous fish." First appearing on Earth almost 450 million years ago, cartilaginous fish today include both fearsome predators and harmless mollusc-eaters (harmless, that is, unless you are a mollusc). A number of...” (from the page’s text)
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