1) Cretaceous ammonite 
Nipponites (`stone of Nippon`) is an extinct genus of heteromorph ammonites. The species of Nipponites (primarily N. mirabilis) are famous for the way their shells form `ox-bow` bends, resulting in some of the most bizarre shapes ever seen among ammonites. The ecology of Nipponites, as with many other nostoceratids, is subject to much speculat...