Cephalopoda - Orthocerida - Orthoceratidae

Full reference: B. Kröger and M. Isakar. 2006. Revision of annulated orthoceridan cephalopods of the Baltoscandic Ordovician. Fossil Record 9(1):137-163

Belongs to Ctenoceras according to B. Kröger and M. Isakar 2006

Sister taxa: Ctenoceras schmidti, Ctenoceras verticillatum

Type specimen: TUG 46-146, a shell. Its type locality is Osmussaar Island, which is in a Lasnamagi open shallow subtidal limestone in the Väo Formation of Estonia.

Ecology: nektonic carnivore