Kronosaurus, named after the Greek God of time "Kronos: belongs to a group of short-necked plesiosaurs called pliosaurs.  It was the largest marine reptile living in the Eromanga Sea and may have been the largest marine reptile in the world.

With teeth up to 30 cm long (most of which was embedded in the jaw) Kronosaurus was clearly a carnivore.  Large fish, squid, ichthyosaurs, turtles, ammonoids, elasmosaurs and even smaller kronosaurs would have fallen prey to the top predator of the time.  Skeletal pieces from some marine reptiles have been found in the gut region of kronosaur skeletons.  The teeth had evolved for tearing huge chunks of flesh off prey rather than chewing. 

Kronosaurus head was over 2 m long - twice as large as the skull of T-Rex. Four massive flippers, up to 2 m in length, powered the beast through the water.

Only a handful of Kronosaurus specimens have ever been found - most are from this region.  Tthe first was a section of jaw with 6 teeth, found by Andrew Crombie near Hughenden in 1899. 

An almost complete skeleton of Kronosaurus was collected from Richmond in 1932 by a team of palaeontologists from Harvard University in the U.S.A. It was reconstructed by Romer to a length of 12m. Although the ribcage was huge, much of the space would have been filled by gigantic lungs. As a reptile, Kronosaurus had to continually return to the surface of the water to breathe, as modern whales do.