Sturgeon, a long-lived, bottom-dwelling fish, are often described as “living fossils,” owing to the fact that their form has remained relatively constant, despite hundreds of millions of years of evolution.

A re-examination of a 300-million-year-old fish, Tanyrhinichthys mcallisteri, revealed that its lifestyle more closely
resembled that of the bottom-dwelling sturgeon, rather than the stealthy pike, as was previously believed….

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Source: archeo