Fig. 28 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia

Fig. 28. Hyolith opercula Conotheca spp. from lower Cambrian Emyaksin Formation, Malaya Kuonamka River and Bol'shaya Kuonamka River, Anabar Uplift, Siberia. A–C. Opercula with long processes, sample K1-3B. A. SMNH X 4630; oblique dorsal (A1), inner (A2), and lateral (A3) views. B. SMNH X 4631; dorsal (B1), inner (B2), and lateral (B3) views. C. SMNH X 4632; outer view. D. Operculum without processes, SMNH X 4633, sample 7/31.5; dorsal (D1) and inner (D2) views. Scale bar 600 μm, except A1, 300 μm.