Fig. 7 in Variability of conch morphology in a cephalopod species from the Cambrian to Ordovician transition strata of Siberia

Fig. 7. Medial sections of ellesmeroceratid nautiloids interpreted below as Ruthenoceras elongatum Korde, 1949, from sample Ang-4, block No. 1, probably latest Furongian Ust-kut Formation found at Pashino on the Angara River, Siberia, Russia. A, B. Mature phragmocones with moderately oblique septa, ZPAL N. IV/14 and 15, respectively. C. Almost complete juvenile phragmocone ZPAL N. IV/92 showing extend of diaphragms in the siphuncle. D–G. Apical parts of phragmocones (not strictly medial sections), ZPAL N. IV/115, 118, 121, and 125, respectively. H. Mature phragmocone ZPAL N. IV/16 with extremely oblique septa. I. Straight part of the phragmocone ZPAL N. IV/17 with oblique diaphragms. Wet ground surfaces (A1, B, C1, D–G, H1, I) and acetate peels (A2, C2, H2).