Jurassic underwater scene, illustration. In the background an ichthyosaur prowls. Behind the seaweed is an ammonite, Lytoceras. A school of belemnites swims near the Lytoceras. On the seafloor are some Jurassic corals and sponges. With sea urchins and a starfish. Top right are some crinoids, pentacrinates, attached to a floating log. Attached to the seaweed are some small heteromorph ammonites, spiroceras. Four ammonites on the right are Stephanoceras.