An investigation of two small-sized taxa assigned to the genus Tetragonites (Ammonoidea, Tetragonitidae) from the Upper Cretaceous (Turonian to Campanian) of Hokkaido, northern Japan
An investigation of two small-sized taxa assigned to the genus Tetragonites (Ammonoidea, Tetragonitidae) from the Upper Cretaceous (Turonian to Campanian) of Hokkaido, northern Japan