A New Species of Gabbioceras (Ammonitida, Tetragonitidae) from the Albian (Lower Cretaceous) of Hokkaido, Japan
Journal: Paleontological Research
Year: 2024

Ammonoid Gabbioceras orientale sp. nov., which represents the first record of the genus in the Northwest Pacific region, is described from the lower Albian in the Mikasa area, Hokkaido, northern Japan. The adult phragmocone of the new taxon is characterized by a fairly wide, funnel-shaped umbilicus with a subangular umbilical shoulder. Its adult body chamber is characterized by rounded umbilical shoulders and rounded, fold-like ribs on the distal part. The stratigraphic distribution of Gabbiocer