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1 July 2014 A New Species of Anagaudryceras (Ammonoidea, gaudryceratidae) From The Lowest Maastrichtian of Hokkaido, Japan
Yasunari Shigeta, Tomohiro Nishimura
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Abstract

Anagaudryceras compressum sp. nov., the most slender of this genus, is newly described from the Nostoceras hetonaiense Zone of earliest Maastrichtian age (Late Cretaceous), in the Hobetsu area, Hokkaido, northern Japan. Its shell is fairly small (< 80 mm in diameter) and compressed with a highly arched venter. The last whorl is ornamented with low, broad, gently flexed band-like ribs. Its ornamentation is very similar to A. matsumotoi, thus suggesting a close phylogenetic relationship with this taxon, which is probably its descendant.

© by the Palaeontological Society of Japan
Yasunari Shigeta and Tomohiro Nishimura "A New Species of Anagaudryceras (Ammonoidea, gaudryceratidae) From The Lowest Maastrichtian of Hokkaido, Japan," Paleontological Research 18(3), 176-185, (1 July 2014). https://doi.org/10.2517/2014PR017
Received: 24 October 2012; Accepted: 1 March 2014; Published: 1 July 2014
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