Xiphactinus audax, the X fish skull Pteranodon ischigualastensis (the species name is

ischigualastensis (the species name is from the Ischigualasto Formation of northwestern Argentina

americanum was around 2

probably skimming the water to find prey

Ozarkcollenia sp

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Xiphactinus audax, the X fish skull Pteranodon ischigualastensis (the species name isXiphactinus audax (from Latin and Greek for "audacious sword ray") was a large, 15 to 20 foot long predatory bony fish that lived in the Niobraran Sea, in what is now North America, during the Late Cretaceous. When alive, the beast would have resembled a gargantuan, fanged tarpon. Skeletal remains of Xiphactinus have come from Kansas, Alabama, and Georgia. Despite being preyed on by sharks and mosasaurs, X. audax was, nonetheless, a voracious predator