Fig. 66 in Early-middle Cambrian stratigraphy and faunas from northern Siberia

Fig. 66. Torellella spp. with evidences of bioerosion, from the lower Cambrian Erkeket Formation, Khorbusuonka River (A–C, E, G) and Tyuser (F, H) and Sekten (D) formations, lower reaches of the Lena River, Siberia, Russia; samples 19/4.25 (A), 19/5.5 (E), 19/14.25 (B), 20/1B (C, G), 21/129 (D), and 22/0 F, H). A–G. Fragments of calcium phosphatic tubes penetrated by sub-vertical canals, SMNH X11307–11313, respectively. E2, close-up of E1 showing perforations. H. Fragment of tube with canals sub-parallel to the surface, SMNH X11314. Scale bar: 500 µm (A–D), 250 µm (E1, F–H), and 80 µm (E2).