Cephalopoda - Orthocerida - Proteoceratidae
Full reference: R. H. Flower. 1962. Part 1, Revision of Buttsoceras, Part 2, Notes on the Michelinoceratida. State Bureau of Mines and Mineral Resources, New Mexico Institute of Mining and Technology, Memoir 10:1-58
Parent taxon: Proteoceratidae according to C. Teichert et al. 1964
Sister taxa: Archigeisonoceras, Baykonuroceras, Cyrtactinoceras, Ephippiorthoceras, Euorthoceras, Gangshanoceras, Gorbyoceras, Liulinoceras, Mesnaquaceras, Metephippiorthoceras, Monomuchites, Orthonybyoceras, Paraproteoceras, Proteoceras, Pseudoliolinoceras, Stereospyroceras, Tofangoceras, Transorthoceras, Treptoceras, Ulmioceras
Subtaxa: Isorthoceras albersi, Isorthoceras bisignatum, Isorthoceras dalecarlense, Isorthoceras junceum, Isorthoceras rogersensis, Isorthoceras subcostatum
Ecology: nektonic carnivore