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Stephanoceras -LRB- meaning crown horn -RRB- is an extinct genus of Stephanoceratacean ammonite which lived during the Bajocian -LRB- Middle Jurassic -RRB- .. Jurassic. Jurassic. Stephanoceratacean. Stephanocerataceae. Bajocian. Bajocian. It is the type genus of the family Stephanoceratidae .. Stephanoceratidae. Stephanoceratidae. type genus. type genus. family. family ( biology )