This mentioned taxonomy is an attempt to make an conclusive assignment from the different classifications of various scientists. Because the taxonomy may change due to the latest investigative methods and other findings, our map is a guide only.
R. C. Frey, 1995 - Middle and Upper Ordovician nautiloid cephalopods of the Cincinnati Arch region of Kentucky, Indiana, and Ohio - U.S. Geological Survey Professional Paper (1066P), 1-126 (serial monograph, English)
C. Teichert, 1964 - Cephalopoda - general features - Endoceratoidea - Actinoceratoidea - Nautiloidea - Bactritoidea - Treatise on Invertebrate Paleontology (K), 1-519 (book/book chapter, English)
R. H. Flower, 1955 - New Chazyan orthocones - Journal of Paleontology (29), 806-830 (journal article, English)