Cephalopoda - Orthocerida - Proteoceratidae

Alternative combination: Orthoceras bisignatum

Belongs to Isorthoceras according to B. Kröger et al. 2011

Sister taxa: Isorthoceras albersi, Isorthoceras dalecarlense, Isorthoceras junceum, Isorthoceras rogersensis, Isorthoceras subcostatum