Fig. 52 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia

Fig. 52. Problematicum Rhombocorniculum insolutum Missarzhevsky in Missarzhevsky and Mambetov, 1981 from lower Cambrian Emyaksin Formation, Malaya Kuonamka River, Anabar Uplift, Siberia; SMNH X 4741; sample 3/42. A. View on the convex (dorsal?) side. B. Lateral view. C. View on the proximal end with broad lumen. D. Apical end with tubular microstructure and central lumen. E. External ornamentation. F. Close-up of E, longitudinal fibres. Scale bar: A–C, 300 μm; D, 30 μm; E, 60 μm; F, 15 μm.