Graphoceras
Graphoceras is an extinct ammonite genus included in the hildoceratacean family Graphoceratidae that lived during the Bajocian stage, Middle Jurassic in what is now Europe, north Africa, and Iran.
Graphoceras produced a compressed, involute shell with a raised umbilical edge and sinuous ribbing.
References
This page contains text from Wikipedia, the Free Encyclopedia - https://wn.com/Graphoceras
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