Jurassic and Cretaceous Period Marine Reptiles coloring pages

These are two of the previously posted drawings from my set of Reptile drawings.  I decided to post these two drawings together.  The second is from the Jurassic Period.  The first is from the Cretaceous Period.  The Cretaceous Period came AFTER the Jurassic.   One big difference in the oceans of the two geologic periods was that in the Jurassic the Pliosaurs were the top marine predators.  In the Cretaceous, it was the Mosaurs who ruled the seas. 

Mosasaur hunting Plesiosaur

This is a drawing of the Cretaceous Sea.  It includes a Mosasaur and a Plesiosaur.  Plesiosaurs were long-neck marine reptiles.  Previously it was thought that Mosasaurs had a a long flat tail.  Now tail flukes have been found on some Mosasaurs so possibly all of them had tail flukes or tail fins.  This is a smaller - possibly subadult Mosasaur hunting a Plesiosaur.  There are a few other animals in the drawing, like the shelled floating Ammonites on the lower left and a crab near the lower right.  These animals were all living in the Late Cretaceous Period.  Plesiosaurs actually also lived in the Jurassic Period.  As far as size, the Mosasaurs could get to be 55 feet long.  Some Plesiosaurs could get to the length of 50 feet, with much of that length made up of their long skinny neck.  FYI some Plesiosaurs (called Pliosaurs) had short necks and they were the kings of the sea in the Jurassic Period.  Remember that THIS is a drawing of the Cretaceous Sea, not the Jurassic Ocean.  

Pliosaur hunts an Ichthyosaur

Pliosaurs are short-necked Plesiosaurs.  One of the more well-known ones is Liopleurodon. It is seen here about to attack an Ichthyosaur.  Opthalmosaurus was an Ichthyosaur with large eyes for seeing in deep and dark water.  The Opthanlmosaurs is about to bite into its favorite prey, an Ammonite.  But the poor Opthalmosaurus is not aware that it is about to become lunch for the Liopleurodon.  To be clear, Liopleurodon was a short-necked Plesiosaur called a Pliosuar.  Opthalmosaurus was a type of Ichthyosaur.  It was considerably smaller than the Ichthyotitan that is further up this post.  Opthalmosaurus was around 20 feet (6 meters) long and marine reptiles from the Liopleurodon genus were somewhere between 16 and 85 feet (5-25 meters) long.  

To find these drawing in printable form just click on the button labeled Paleontology and then scroll down to near the bottom of the Mesozoic Life section of the page.  Have fun coloring!