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...
Found on http://en.wikipedia.org/wiki/Xainzanoceras
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