Fig. 7 in Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities

Fig. 7. Details of siphuncle and septal necks, median sections of cyrtoconic ellesmeroceratids from the Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. Note the loxochoanitic septal necks and the concave siphuncular segments. A. Lawrenceoceras larus sp. nov., FMNH-P30355, paratype, from bed PO 131. B. Lawrenceoceras ebenus sp. nov., FMNH-P30335, holotype, from bed PO 123.3. Scale bar = 1 mm for all figures.