Fig. 28 in Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities

Fig. 28. Reconstruction and interpretation of details of connecting ring and septal necks.A–B. Bactroceras boliviensis Aubrechtová, 2015.A. Specimen FMNH-P30243, see Fig. 27D. B. Specimen FMNH-P30215, see Fig. 29A. C. Eosomichelinoceras borealis sp. nov., from the Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen, specimen FMNH-P30305, see Fig. 33C. Black: septal neck and septum. Dark grey: connecting ring. Light grey: endosiphuncular deposits. Without scale.