Ephippioceratoidea Miller & Youngquist 1949

Superfamily Ephippioceratoidea Miller & Youngquist, 1949 Diagnosis Superfamily of the suborder Liroceratina with a pachyconic or globular, involute to subinvolute conch. Whorl profile in the adult stage usually more or less strongly depressed; flanks and venter form a continuous arch. Ornament usually consisting of fine growth lines; some species have spiral lines or fine ribs. Septum strikingly bilobate; suture line with high external saddle. Included family Ephippioceratidae Miller & Youngquist, 1949 (Early Carboniferous to Early Permian; 3 genera, 26 species).