Cephalopoda - Orthocerida - Proteoceratidae

Alternative combination: Orthoceras subcostatus

Belongs to Isorthoceras according to D. H. Evans 1993

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

Type specimen: TCD7933 (neotype), a shell. Its type locality is Killey Bridge Fm. locality 1, NE of Pomeroy, which is in a Richmondian offshore mudstone/siltstone in the Killey Bridge Formation of the United Kingdom.

Ecology: nektonic carnivore