Fig. 53 in Early-middle Cambrian stratigraphy and faunas from northern Siberia

Fig. 53. Hyolith conchs Parakorilithes mammillatus He and Pei in He et al., 1984, from the lower Cambrian Erkeket Formation, Khorbusuonka River, Siberia, Russia; sample 19/10.25. A–D. Phosphatised conchs, SMNH X11223–11225, and 11351 respectively. B1, C1, dorsal; B2, D2, lateral; B3, oblique lateral; C2, B4, apertural; and D1, oblique apertural views. Scale bar 250 µm.