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30 September 2012 Two New Ammonoid Genera of the Subfamily Gabbioceratinae from the Upper Albian (Lower Cretaceous) of Hokkaido, Japan
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Abstract

Two ammonoids of the subfamily Gabbioceratinae, Obataceras manjiense gen. et sp. nov. and Tanabeceras pombetsense gen. et sp. nov., are described from the Upper Albian of Hokkaido, Japan. The Gabbioceratinae evolved and radiated mainly in the Mediterranean area during Late Aptian to Middle Albian times, but thereafter disappeared from the region. The occurrences of Gabbioceratinae in Hokkaido suggest that their geographical distribution was extended to the Northwest Pacific before the Late Albian, where they then flourished from Late Albian to Cenomanian time.

© by the Palaeontological Society of Japan
Yasunari Shigeta, Masao Futakami, and René Hoffmann "Two New Ammonoid Genera of the Subfamily Gabbioceratinae from the Upper Albian (Lower Cretaceous) of Hokkaido, Japan," Paleontological Research 16(3), 208-218, (30 September 2012). https://doi.org/10.2517/1342-8144-16.3.208
Received: 14 October 2010; Accepted: 1 March 2012; Published: 30 September 2012
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