Fig. 24 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia

Fig. 24. Opercula of hyoliths Majatheca tumefacta Missarzhevsky in Rozanov et al., 1969 with phosphatised microstructure of the walls from lower Cambrian Emyaksin Formation, Malaya Kuonamka River, Anabar Uplift, Siberia. A. SMNH X 4607 (Mo 160465 in Kouchinsky 2000b: fig. 7), sample 1/7.8; inner (A 1), dorsal (A 2), and ventral (A 3) views. B. SMNH X 4608 (Mo 160467 in Kouchinsky 2000b: fig. 7), sample K1-3B; broken operculum with phosphatised canals preserved. Scale bar: A, 600 μm; B, 300 μm.