Cephalopoda - Ceratitida - Ceratitidae

Alternative combination: Eutomoceras (Halilucites) dalli

Full reference: J. P. Smith. 1914. The Middle Triassic marine invertebrate faunas of North America. United States Geological Survey Professional Paper 83:1-254

Belongs to Eutomoceras according to C. Monnet and H. Bucher 2005

Sister taxa: Eutomoceras dunni, Eutomoceras lahontanum, Eutomoceras laubei, Eutomoceras rarum

Type specimen: Its type locality is Divide between Troy Canyon and South Fork of American Canyon (rotelliformis), which is in an Illyrian marine limestone in Nevada

Average measurements (in mm): shell diameter 74.8