Fig. 45 in Early-middle Cambrian stratigraphy and faunas from northern Siberia

Fig. 45. Hyolith opercula, presumably Cupitheca sp. (see Fig. 44), from the lower Cambrian Erkeket Formation, Khorbusuonka River, Siberia, Russia; sample 19/12.75. A–E. Phosphatised opercula, SMNH X11173–11177, respectively. A1, C1, outer surface; A2, lateral view; C2, oblique dorsal view; D1, inner surface; D2, oblique lateral view. Scale bar 250 µm.