Yinoceras

The genus Yinoceras is a middle Permian goniatitid, the type for the subfamily Yinoceratinae of the now extinct Pseudohaloritidae. The shell of Yinoceras is involute, small to intermediate in size, subglobular or thickly discoidal with a very small umbilicus, convex flanks, and rounded venter. The surface is usually marked by weak constrictions an...
Found on http://en.wikipedia.org/wiki/Yinoceras
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