A new species of Anagaudryceras (Ammonoidea, Gaudryceratidae) from the lowest Maastrichtian of Hokkaido, Japan

被引：2
作者：
Shigeta, Yasunari [1 ]
Nishimura, Tomohiro [2 ]
机构：
[1] Natl Museum Nat & Sci, Dept Geol & Paleontol, Tsukuba, Ibaraki 3050005, Japan
[2] Hobetsu Museum, Mukawa, Hokkaido 0540211, Japan
来源：
PALEONTOLOGICAL RESEARCH | 2014年 / 18卷 / 03期
关键词：
ammonoid; Anagaudryceras; Cretaceous; Hobetsu; Hokkaido; Maastrichtian;
D O I：
10.2517/2014PR017
中图分类号：
Q91 [古生物学];
学科分类号：
0709 ; 070903 ;
摘要：
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.
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收藏
页码：176 / 185
页数：10
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