Taxon - Odkazy a literatura
Marek J. (1999): Ordovician cephalopods of the Prague Basin (Barrandian area, Czech Republic): a review, Acta universitatis Carolinae - Geologica, 43 (1/2), 413-416 [jako Orthoceras eruca]
Marek J. (1999): Ordovician cephalopods of the Prague Basin (Barrandian area, Czech Republic): a review, Acta universitatis Carolinae - Geologica, 43 (1/2), 413-416 [jako Orthoceras eruca]