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1 October 2013 A New Species of Tanabeceras (Ammonoidea, Gaudryceratidae) from the Lowest Cenomanian of Hokkaido, Japan
Yasunari Shigeta
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Abstract

Tanabeceras horokanaiense sp. nov. is described from the lowest Cenomanian (Upper Cretaceous) in the Horokanai area, Hokkaido, northern Japan. This new taxon, which represents an intermediate form between T. yezoense (Shigeta, 1996) and T. mikasaense (Shigeta, 1996), suggests that Tanabeceras evolved and radiated in the Northwest Pacific realm during the early Cenomanian. This evidence together with the presence of many endemic gaudryceratid ammonoids strongly suggests that there was something to separate distribution of the gaudryceratids between the Northwest Pacific realm and other regions during early Cenomanian time.

© by the Palaeontological Society of Japan
Yasunari Shigeta "A New Species of Tanabeceras (Ammonoidea, Gaudryceratidae) from the Lowest Cenomanian of Hokkaido, Japan," Paleontological Research 17(4), 312-316, (1 October 2013). https://doi.org/10.2517/1342-8144-17.4.312
Received: 15 November 2012; Accepted: 1 February 2013; Published: 1 October 2013
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