Fig. 29 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia

Fig. 29. Hyolith opercula Triplicatella spp. from lower Cambrian Emyaksin Formation, Malaya Kuonamka River and Bol'shaya Kuonamka River, Anabar Uplift, Siberia. A, B. Triplicatella papilio sp. nov. A. SMNH X 4646, holotype, sample K1-3B; dorsal (A1), lateral (A2, A4), inner (A3), and ventral A5, note flattened rounded polygons at the base of the dorsal folds) views. B. SMNH X 4647, paratype, sample 7/70; dorsal (B1) and inner (B2) views. C. Triplicatella sinuosa Skovsted, Peel, and Atkins, 2004; SMNH X 4648, sample B-247; outer (C1), oblique ventral (C2), lateral (C3), and dorsal (C4) views. D. Triplicatella cf. T. peltata Skovsted, Peel, and Atkins, 2004; SMNH X 4649, sample 7/70; dorsal (D1), inner (D2), oblique inner (D3), and lateral D4) views. Scale bar 600 μm, except A1, A5, 300 μm.