Fig. 19 in Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities

Fig. 19. Details of the conch surface of rioceratid cephalopods from the Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. A. Hinlopoceras venti gen. et sp. nov., FMNH- P30262, from bed PO 07, lateral view with ventral, prosiphuncular side toward left. B. Hinlopoceras tempestatis gen. et sp. nov., FMNH-P30359, from bed PO 07, lateral view with ventral, prosiphuncular side toward right. C. Svalbardoceras skua gen. et sp. nov., FMNH-P30408, from bed PO 123.3. D. Svalbardoceras sterna gen. et sp. nov., FMNH-P30373, from bed PO 7.5. Scale bar = 5 mm for all figures.