Fig. 21 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia

Fig. 21. Internal moulds of bivalved molluscs from lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River, Anabar Uplift, Siberia; sample 7/70. A. Fordilla cf. F. sibirica Krasilova, 1977, SMNH Mo 167690; right lateral (A1), dorsal (A2), and oblique dorsal (A3) views; A4, close-up of A1. B. Undetermined fordillid bivalve, SMNH Mo 167691, left lateral view. C. Fragment of a larger specimen, interpreted herein as Fordilla cf. F. sibirica, SMNH Mo 167692, lateral view. Scale bar 1000 μm, except A4, 100 μm.