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Styxosaurus is a Marine Reptile from the Cretaceos period.  They are part of family called Elasmosaurus a sub family of the Pleistosaurs.  They have a style of fishing, they hunt by swimming through schools and eat the straglers.  If seen they are considered to be very graceful.  They been known to the top predator of the Ocean.  Except, years latter scientists found a bigger creature and tougher creature.  The Moasaurus; scientist believe that these graceful swimmers are targeted by these giant reptiles and are considered to much faster than Styxosaurus.  Styxosaurus ate mainly fish, Ammonites, squids and clams.