Fig. 54 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia

Fig. 54. Problematicum Fengzuella zhejiangensis He and Yu, 1992 from lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River, Anabar Uplift and middle Lena River, Siberia. A. Planispiral sclerite, SMNH X 4776, sample 7/45; A1, lateral view on the sclerite; A2 and A3, oblique views; A4, close-up of overlapping growth increments. B. Curved sclerite, SMNH X 4778, sample 7/64; B1, lateral view of the fragment; B2, close-up of B3; B3, view on the cross-section of sclerite, in the upper part of B1. C. Curved sclerite, SMNH X 4777, sample 7/55.8; C1, lateral view on the sclerite; C2, transversal view. D. Curved sclerite, SMNH X 4779, sample 2001-11b; lateral (D1), oblique transversal (D2), and oblique apical (D3) views; D4, close-up of the apical end of sclerite. Scale bar: 200 μm, except D1–D3, 300 μm; A4, B2, D4, 60 μm.