About 518 million years ago, a fierce shrimp-like creature didn’t brandish just one “knife,” it flashed more than 800 of them; each of its 54 legs had up to 15 dagger-like spines on it, a new study finds.

The name of this newly discovered Cambrian period scavenger, Xiaocaris luoi, literally means “Luo’s small shrimp” — and it was small, just 0.8 inches (2 centimeters) long — but its vicious weapons likely meant that its mealtimes were filled with frenzied cutting, the researchers said. 

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