ICZN. (1974). Opinion 1003. Orthoceras Bruguière, 1789 (Class Cephalopoda): Placed on the Official List of Generic Names. Bulletin of Zoological Nomenclature. 30: 142-146.
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ICZN
1974
Opinion 1003. <i>Orthoceras</i> Bruguière, 1789 (Class Cephalopoda): Placed on the Official List of Generic Names