Abstract. 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,… Click to show full abstract
Abstract. 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 Gabbioceras in Hokkaido suggests that the genus migrated from the Mediterranean area or Madagascar to the Northwest Pacific region during early Albian time, and then became extinct during middle Albian time, similar to Gabbioceras from other areas.
Journal Title: Paleontological Research
Year Published: 2024
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