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Omphalosaurus
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<p><i>Omphalosaurus</i> (from the Greek root "Button Lizard", for their button-like teeth) is an <a href="/facts/Extinct/24p5NP2q">extinct</a> <a href="/facts/Genus/m8EFjSms">genus</a> of <a href="/facts/Marine_reptile/3Go3Kgk2">marine reptile</a> from the <a href="/facts/Early_Triassic/oBgudq2V">Early Triassic</a> to <a href="/facts/Middle_Triassic/Y0FBoqA8">Middle Triassic</a>, thought to be in the order of <a href="/facts/Ichthyosaur/fBNIIJaJ">Ichthyosauria</a>. Most of what is known about <i>Omphalosaurus</i> is based on multiple jaw fragments, ribs, and vertebrae. Specimens of <i>Omphalosaurus</i> have been described from the western United States, Poland, Austria and the island of <a href="/facts/Spitsbergen/23SBB9pF">Spitsbergen</a> off the northern coast of Norway. </p>