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Xainzanoceras : ウィキペディア英語版 | Xainzanoceras
''Xainzanoceras'', defined by Chen, 1987, is a nautiloid cephalopod from the Upper Ordovician of China, assigned to the tarphyceratid family Lituitidae. The type, ''Xainzanoceras xizangense'' Chen resembles the ophidioceratid genus ''Ophioceras''. The shell is evolute, discoidal, serpenticonic; whorl section rounded, covered with thick, straight, close spaced, radial ribs that curve slightly forward at the ventral margin where they become quickly reduced or lost. ==References==
*Chen Ting Yan, 1987. Ordovician Nautilus Xainza: Nanjing Institute of Geology and Paleontology Series 11:133-191,1987.
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