RICHARD BIZLEY / SCIENCE PHOTO LIBRARY RICHARD BIZLEY / SCIENCE PHOTO LIBRARY
Triassic underwater scene, illustration. In the background is an early type of plesiosaur (Alexeyisaurus). The crinoids are Encrinus liliiformis. Swimming amongst the crinoids are some ammonites. The three main ammonites are ceratites. The vertical-shaped heteromorph ammonites are Rhabdoceras.
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