Cephalopoda - Nautilida - Tainoceratidae

Full reference: A. K. Miller and H. D. Thomas. 1936. The Casper Formation (Pennsylvanian) of Wyoming and its cephalopod fauna. Journal of Paleontology 10:715-738

Belongs to Metacoceras according to A. K. Miller and W. Youngquist 1949

Sister taxa: Metacoceras altilobatum, Metacoceras artiense, Metacoceras baylorense, Metacoceras bituberculatum, Metacoceras bowmani, Metacoceras cheneyi, Metacoceras chittidilense, Metacoceras copei, Metacoceras dorashamense, Metacoceras dorsoarmatum, Metacoceras dubium, Metacoceras hayi, Metacoceras hunanense, Metacoceras inconspicuum, Metacoceras kruglovi, Metacoceras medlicottianum, Metacoceras orthogonium, Metacoceras parartiense, Metacoceras subpiszovi, Metacoceras subquadratum, Metacoceras sulciferum, Metacoceras unklesbayi

Type specimen: SUI 1155/6. Its type locality is Gilmore Canyon, Stenopoceras beds, 8 miles SE of Laramie, which is in an Asselian marine limestone in the Casper Formation of Wyoming.

Ecology: nektobenthic carnivore

Average measurements (in mm): shell width 55.0, shell diameter 115.0