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fish

Xiphactinus ( from Latin and Greek for "sword ray" ) is an extinct genus of large marine predary fish that existed in the late Cretaceous Period, between 99 and 65 million years ago.


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Helicoprion is a genus of shark-like, spiral-toothed prehistoric fish that arose in the early Permian, about 290 million years ago, survived the Permian-Triassic extinction event, and eventually became extinct during the early Triassic, some 250 million years ago.


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