Cephalopoda
Family

Phtanoncoceratidae Evans et King, 1990

Selection of related publications
Kröger, B., Mutvei, H. 2005. Nautiloids with multiple paired muscle scars from Lower-Middle Ordovician of Baltoscandia. Palaeontology 48, 4, 781-791. Wiley. DOI:10.1111/j.1475-4983.2005.00478.x