Troedssonellidae Dataset Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities Rank FAMILY Classification phylum Mollusca class Cephalopoda order Orthocerida family Troedssonellidae Name Homonyms Troedssonellidae Kobayashi 1935 Troedssonellidae