Xiphactinus was one of the largest bony fish of the Late Cretaceous and is considered one of the fiercest creatures in the sea. A powerful tail and winglike pectoral fins shot the 17-foot-long (5 ...

“It’s a Xiphactinus audax — they call it the X-fish,” said Detrich, a professional fossil hunter from Great Bend. His X-fish is almost 13 feet long and weighs about 700 pounds. There’s a ...

Evidence suggests Cretoxyrhina fed on mosasaurs, plesiosaurs, and even the giant bony fish Xiphactinus, a fierce predator itself. Sharks are made of cartilage, which does not fossilize well.