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.图版43 俄罗斯西伯利亚科布苏翁卡河下寒武统埃尔克凯特组（A、C—E）与勒拿河下游蒂尤塞尔组（B）产出的软舌螺（Hyolith）壳盖马扎赫特壳属（Majatheca）未定种；对应标本编号分别为11/16.05（A、C、E）、11/2B（D）及21/21（B）。A至E均为磷酸盐化壳盖，登记号依次为SMNH X11159–11163。其中C1、E1为外表面视图；C2、E2为腹面斜视图；D1为内表面视图；D2为背面斜视图。比例尺为500 µm。