Jiagouceras is an early primitive cephalopod from the Upper Cambrian of China, assigned to the Plectronoceratidae. The shell is small, nearly straight with a slight endogastric curvature and compressed cross section. The siphuncle is close to the ventral margin, with segments expanded into the chambers. Jiagouceras is found in the Wanwankou member...
Found on http://en.wikipedia.org/wiki/Jiagouceras
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