Fig. 43 in Early-middle Cambrian stratigraphy and faunas from northern Siberia

Fig. 43. Hyolith opercula Majatheca sp. from the lower Cambrian Erkeket Formation, Khorbusuonka River (A, C–E) and Tyuser Formation, lower reaches of the Lena River (B), Siberia, Russia; samples 11/16.05 (A, C, E), 11/2B (D), and 21/21 (B). A–E. Phosphatised opercula, SMNH X11159–11163, respectively. C1, E1, outer surface; C2, E2, oblique ventral view; D1, inner surface; D2, oblique dorsal view. Scale bar 500 µm.