| Summary: | Fig. 27. Bivalve mollusc Fordilla sibirica Krasilova, 1977 from the lower Cambrian Tyuser (A, B) and Erkeket (C, D) formations and Pojetaia dentifera Kouchinsky, Bengtson, Clausen, Gubanov, Malinky, and Peel, 2011, from Sekten Formation (E–G), lower reaches of the Lena River (A, B, E–G) and Khorbusuonka River (C, D), Siberia, Russia; samples 21/54 (A, B), 20/1B (C), 19/40 (D), and 22/50 (E–G). A–G. Internal moulds, SMNH Mo194721– 194727, respectively. A1, Scanning electron microscope image showing muscle scars on the surface of internal mould, left valve. A2, A3, light-microscope micrographs showing muscle scars (arrowed), left and right sides of internal mould corresponding, respectively, to inner surfaces of left and right valves; G1, dorsal; C2, oblique dorsal; and C1, G2, lateral views. Scale bar: 500 µm (A1, B–G) and 830 µm (A2, A3). Published as part of Kouchinsky, Artem, Alexander, Ruaridh, Bengtson, Stefan, Bowyer, Fred, Clausen, Sébastien, Holmer, Lars E., Kolesnikov, Kirill A., Korovnikov, Igor V., Pavlov, Vladimir, Skovsted, Christian B., Ushatinskaya, Galina, Wood, Rachel & Zhuravlev, Andrey Y., 2022, Early-middle Cambrian stratigraphy and faunas from northern Siberia, pp. 341-464 in Acta Palaeontologica Polonica 67 (2) on page 382, DOI:10.4202/app.00930.2021, http://zenodo.org/record/12198251
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