Ainoceras

{{Short description|Genus of molluscs (fossil)}} {{More citations needed|date=September 2014}} {{Automatic taxobox | fossil_range = {{fossil range|Campanian|ref=<ref name="Sepkoski Ceph">{{cite web | last = Sepkoski| first = Jack| title= Sepkoski's Online Genus Database|author-link =| year = 2002| url = http://strata.geology.wisc.edu/jack/showgenera.php?taxon=231&rank=class| access-date = 2014-05-28 }}</ref>}} | image = Ainoceras kamuy - National Museum of Nature and Science, Tokyo - DSC06974.JPG | image_caption = ''Ainoceras kamuy'' | taxon = Ainoceras | authority = Matsumoto & Kanie, 1967 | subdivision_ranks = Species | subdivision = }}

'''''Ainoceras''''' ("Ainu's Horn") is a genus of extinct, aberrantly coiled ammonite cephalopod that live in the Pacific Ocean during the Campanian division of the Cretaceous, where Japan is today. Their shells were coiled very similarly to the related ''Anaklinoceras'', in that, when young, the shell coiled helically, and then upon reaching adulthood, the shell then bent over the older coils. However, ''Ainoceras'' differed in this respect in that, whereas in ''Anaklinoceras'', the youngest coil wrapped very closely around the older coils, while in ''Ainoceras'', the youngest coil bent over the older coils in a wide loop or oxbow.

==References== {{Reflist}}

Category:Ammonitida genera Category:Nostoceratidae Category:Ammonites of Asia Category:Late Cretaceous ammonites Category:Late Cretaceous animals of Asia Category:Fossils of Japan