Nipponites

Nipponites is an extinct genus of heteromorph ammonites. The shells of "Nipponites" (primarily "N. mirabilis") form "ox-bow" bends, resulting in some of the most bizarre shapes seen among ammonites.
The ecology of "Nipponites", as with many other nostoceratids, is subject to much speculation.
Distribution.
Fossils of most species are found primarily in Upper Cretaceous strata of Japan. "N. mirabilis" is found in Coniacian-aged strata of Japan and possibly Turonian-aged strata in Madagascar. "N. bacchus" is found in Upper Cretaceous Hokkaido. Two species are found exclusively outside Japan, "N. sachalinensis", which is found in Upper Cretaceous strata of Sakhalin island, and Kamchatka peninsula, and "N. occidentalis", which is known from two shells found in the Turonian-aged Hornbrook Formation of Southern Oregon.