This is a beautiful sheet consisting of 16 stamps, issued in 2001, displaying a variety of primitive reptiles. The animals shown include the Lagosuchus, Thadeosaurus, Ardeosaurus, Megalania, Hyperodapedon, Plotosaurus, Planocephanosaurus, Petrolacosaurus, Araeoscelis, Gracilisuchus, Terrstrisuchus, Champsosaurus, Ornithosuchus, Longisquama, Protosaurus, and the Askeptosaurus. The sheet is Post Office fresh, mint never hinged.