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Fig. 30 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 30. Pelagiellid and khairkhaniid molluscs from the lower Cambrian Erkeket Formation, Khorbusuonka River (A, B, D, E, G, H), Sekten Formation, lower reaches of the Lena River (C, F, I) formations and Kessyusa Group, Khorbusuonka River (J), Siberia, Russia; samples 19/12.75 (A, D, G, H), 19/29 (B), 19/40 (E), 22/50 (C, F, I), and 15/23 (J). A, D. Pelagiella sp. 1, internal moulds, SMNH Mo194738 and 194739, respectively. B, C, E–H. Pelagiella spp., internal moulds, SMNH Mo194740–194745, respectively. E1, apertural view; E2, adapical view. I. Phosphatised wall of Pelagiella sp. cf. Cambretina mareki Horný, 1964, SMNH Mo194746. J. Nomgoliella sinistrovolubilis Missarzhevsky, 1981, internal mould, SMNH Mo194747. J1, apertural view; J2, adapical view. Scale bar: 1 mm (J) and 500 µm (A–I).
Fig. 27. Bivalve mollusc Fordilla sibirica Krasilova, 1977 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
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).
Fig. 26. Bivalve mollusc Fordilla sibirica Krasilova, 1977 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 26. Bivalve mollusc Fordilla sibirica Krasilova, 1977, from the lower Cambrian Erkeket Formation, Khorbusuonka River, Siberia, Russia; sample 19/12.75. A–C. Internal moulds, SMNH Mo194719, 167596, and 194720, respectively. A1, B1, C, lateral view; A2, dorsal view, A3–A5, B2–B4, close-ups showing surface textures. Scale bar: 830 µm (C), 500 µm (A1, A2, B1), 100 µm (A3–A5, B2–B4).
Fig. 56 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 56. Sclerites of protoconodonts (A–E) and problematic spines (F–I) from the early and middle Cambrian, Khorbusuonka River, Siberia, Russia; samples 11/2B (B), 19/55 (E), and 19/61 (F–I) from the Erkeket Formation and 19/3B (C) and 19/5B (A, D) from the Kuonamka Formation. A, C. Gapparodus bisulcatus (Müller, 1959), SMNH X 11236 and X11237, respectively. B. Protohertzina sp., SMNH X11240. D. Sclerite tentatively assigned to Gapparodus bisulcatus (Müller, 1959), SMNH X11238. D1, view on the concave side; D2, lateral view. E. Amphigeisina danica (Poulsen, 1966), SMNH X11239. F–I. Calcium phosphatic internal moulds of problematic spines with corrugated walls, SMNH X11241–11244, respectively. Scale bar: 500 µm (A–E) and 250 µm (E–I).
Fig. 24 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 24. Molluscs from the lower Cambrian Erkeket Formation, Khorbusuonka River (A–F, J–N) and Sekten Formation, lower reaches of the Lena River (G–I), Siberia, Russia; samples 11/2B (E, F, J), 11/16.1 (K, M, N), 19/12.75 (A), 19/11.75 (B), 20/1B (L, O, P), 20/6B (C, D), and 22/50 (G–I). A, B. Davidonia anabarica (Parkhaev, 2005), internal moulds, SMNH Mo194701 and 194702, respectively. C. Mellopegma sp., internal mould, SMNH Mo194713. D. Stenotheca cf. drepanoida (He and Pei in He et al., 1984), silicified shell, SMNH Mo194714. D1, lateral view; D2, oblique apertural view. →
Fig. 25. Mollusc Watsonella crosbyi Grabau, 1900 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 25. Mollusc Watsonella crosbyi Grabau, 1900, from the lower Cambrian Erkeket Formation, Khorbusuonka River, Siberia, Russia; sample 15/23. Internal (A) and external (B) moulds, SMNH Mo194717 and 194718, respectively, of probably the same specimen. A1, lateral view; A2, dorsal view; B1, B3, close-ups showing replicated sculpture on the shell surface. Scale bar: 1 mm (A, B2), 250 µm (B3), and 80 µm (B1).
Fig. 23. Tommotiid Lapworthella Cobbold, 1921 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 23. Tommotiid Lapworthella Cobbold, 1921 from the Cambrian Erkeket Formation, Khorbusuonka River (A–D, F–L, O–Q) and Tyuser Formation, lower reaches of the Lena River (E, M, N), Siberia, Russia; samples 11/18.7 (G, L), 11/21.6 (H, I), 19/1.5 (D), 19/5.5 (F, J, K), 19/31.75 (Q), 20/1B (A–C), 20/5B (O, P), 21/22.7 (M, N), 21/112 (E). A–F, J, K. Lapworthella lucida Meshkova, 1969 sclerites, SMNH X11018–11025, respectively. G–I, L–N. Lapworthella tortuosa Missarzhevsky in Rozanov and Missarzhevsky, 1966 sclerites, SMNH X11026–11031, respectively. O–Q. Lapworthella dentata Missarzhevsky in Rozanov et al., 1969 sclerites, SMNH X11032–11034, respectively. Scale bar 250 µm.
Fig. 22 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 22. Tommotiid Camenella Missarzhevsky in Rozanov and Missarzhevsky, 1966 from the lower Cambrian Erkeket Formation, Khorbusuonka River, Siberia, Russia; samples 11/19.5 (A, E, G), 11/18.7 (B), 11/21.6 (C, D, F, H, I, J, L), and 11/28.8 (K). A, B, E. Camenella garbowskae Missarzhevsky in Rozanov and Missarzhevsky, 1966, mitral sclerites, SMNH X11006–11008, respectively. F. Camenella plana (Missarzhevsky in Rozanov et al., 1969), mitral sclerite SMNH X11009, tentatively synonymized with C. garbowskae. C, G–J, L. Camenella garbowskae Missarzhevsky in Rozanov and Missarzhevsky, 1966, sellate sclerites, SMNH X11010–11015, respectively. D. Camenella cf. C. garbowskae, sellate sclerite, SMNH X11016. K. Camenella aff. C. garbowskae, sellate sclerite, SMNH X11017. Scale bar: 500 µm (A–D, F–I, K, L) and 1 mm (E, J).
Fig. 19 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 19. Paterinida gen. and sp. indet., ventral valves, from the lower Cambrian Erkeket Formation, Khorbusuonka River, Siberia, Russia; samples 11/2B (A, C, D) and 11/16.05 (B). A. SMNH Br151269. Apical part and subapical proximal margin of the shell. A1, oblique posterior view; A2, posterior view. B. SMNH Br151270. Apical fragment with subapical margin. C. SMNH Br151271. Juvenile specimen showing brephic shell. C1, lateral view; C2, plan view. D. SMNH Br151362. Fragment with distal part of the shell. D1, posterior view; D2, external surface of the fragment; D3, lateral view. Scale bar 500 µm.
Fig. 55 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 55. Hyolithid helens from the lower Cambrian Erkeket Formation, Khorbusuonka River (A, B, E, F) and Tyuser (D) and Sekten (C) formations, lower reaches of the Lena River, Siberia, Russia; samples 19/10.75 (A, B, E), 20/1B (F), 21/21 (D), and 22/50 (C). A–F. Phosphatized hyolithid appendages (helens), SMNH X11230–11235, respectively. A2, enlargement of A1 showing proximal end; B1, upper surface; B2, oblique view on the upper and frontal (left side in B1) surfaces; B3, view on the rear margin of the helen (right side in B1); B4, close-up of proximal portion; E1, oblique lateral view; E2, F1, plain view; F2, F3, view on the margin (left side in F1). Scale bar: 500 µm (C, D), 250 µm (A1, B1–B3, E, F), 80 µm (A2, B4).
Fig. 21 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 21. Tommotiid Tannuolina cf. pavlovi from the lower Cambrian Erkeket Formation, Khorbusuonka River, Siberia, Russia; sample 19/3.25. A, B. Mitral sclerites, SMNH X11003 and 11004, respectively. A1, view on the accrescent side; A2, apical view. C. Fragment of sclerite with large pores, SMNH X11005. Scale bar 250 µm.
Fig. 42 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 42. Hyolith Michniakia minuta Missarzhevsky in Rozanov and Missarzhevsky, 1966, from the lower Cambrian Erkeket Formation, Olenyok Uplift, Siberia, Russia; sample 20/1B. A–E. Internal moulds with partially phosphatised shell and phophatic coatings, SMNH X X11353–11357, respectively. A. Phosphatised shell with longitudinal and tangential fibrosity and pores in the wall. A3, lateral view showing ventral sinus of the aperture (arrow); →
Fig. 20 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 20. Stem-group Brachiopoda indet. from the lower Cambrian Erkeket Formation, Khorbusuonka River, Siberia, Russia; sample 20/1B. Fragments of shell, SMNH X11001 (A) and SMNH X11002 (B). A1, B2, general view; A3, A4, close-ups showing prismatic walls and openings of presumably setigerous canals; B1, enlargement showing prismatic wall. Scale bar: 500 µm (A1, A2, B2), 125 µm (A4, B1), and 50 µm (A3).
Fig. 62 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 62. Blastozoan plates from the lower Cambrian Erkeket Formation, Khorbusuonka River, Siberia, Russia; samples 20/2B (A, B), 20/5B (I, J, K, U), 19/12.75 (C, F), 19/11.75 (D, E), 19/10.25 (G, H), 19/107 (L, S, T), 19/46.5 (M, N, P, Q), 19/65.5 (O), and 19/2B (R). A, B. Brachiolar, biserial plates, SMNH Ec36852 and 36853. A1, articulation surface and aboral canal, arrowed; A2, aboral surface; A3, oral surface. C–F. Brachial, uniserial plates, SMNH Ec36854–36857, respectively. G–R. Stem holomeric columnals, SMNH Ec36858–36869, respectively. K1, lateral view; K2, oblique view showing articulation facet; M1, lateral view of a stem fragment consisting of three articulated ossicles; M2, oblique view showing articulation facet; N1, fragmentary stem ossicle in oblique lateral view; N2, view on the articulation facet; O1, elongated stem ossicle, oblique lateral view showing articulation facet; O2, lateral view; R1, discoidal stem ossicle, view on the articulation facet; R2, oblique lateral view. S–T. Distal fragments of holomeric stem including columnals articulated with a holdfast, SMNH Ec36870–36871, respectively. U. Holdfast?, SMNH Ec36872. Scale bar: 500 µm (E–J, K1, M–O) and 250 µm (A–D, K2, L, P–U).
Fig. 28 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 28. Pelagiellid mollusc Aldanella sibirica Parkhaev and Karlova, 2011, from the lower Cambrian Erkeket Formation, Khorbusuonka River, Siberia, Russia; samples 11/16.05 (A, B, E–H) and 11/2B (C, D). A–H. Phosphatised shells, phosphatic coats and partially preserved phosphatic interal moulds, SMNH Mo194728–194735, respectively. A1, adapical view; A2, apertural view. B. Internal mould with probably diagenetic polygonal structures; B2, close-up showing polygons. Scale bar: 500 µm (F–H), 250 µm (A, B1, C–E), and 125 µm (B2).
Fig. 46 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 46. Hyolith conchs and opercula, Triplicatella sp., from the middle Cambrian Kuonamka Formation, Khorbusuonka River, Siberia, Russia; sample 19/65.5. A–D. Silicified internal moulds of conch closed with operculum, SMNH X11178–11181, respectively. A1, lateral view; A2, apertural view. Scale bar: 1 mm (B) and 500 µm (A, C, D).
Fig. 36 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 36. Sclerites of chancelloriids from the lower Cambrian Erkeket Formation, Khorbusuonka River (A, K, N, P–S) and Tyuser Formation, lower reaches of the Lena River (B–J, L, M, O), Siberia, Russia; samples 11/16.1 (A), 19/5B (N), 19/11.75 (P–S), 19/12.75 (K), 21/21 (B–H), 21/51 (I, J), 21/54 (L, M, O). A–D, P, R, S. Chancelloria spp. with a central ray, SMNH X11094–11100, respectively. F–H, M, Q. Chancelloria spp. without a central ray, SMNH X11101–11105, respectively. E, N, O. Allonnia sp., SMNH X11106–11108, respectively. I–L. Archiasterella sp., SMNH X11109–11112, respectively. Scale bar: 500 µm (A–O, Q) and 250 µm (P, R, S).
Fig. 50 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 50. Hyolith opercula from the lower Cambrian Erkeket Formation, Khorbusuonka River (A, C, D) and Tyuser Formation, lower reaches of the Lena River (B), Siberia, Russia; samples 11/16.05 (A), 11/2B (C, D), and 21/21 (B). A–D. Phosphatised orthothecid opercula of four different types, SMNH X11203–11206, respectively. A1, B3, outer surface; A2, D2, inner surface; B1, C1, D3, lateral view; B2, ventral view; C2, oblique inner surface; C3, D1, dorsal view. Scale bar: 625 µm (D), 500 µm (B), and 250 µm (A1, A2, C).
Fig. 63 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 63. Echinoderm plates from the lower Cambrian, Erkeket Formation, Khorbusuonka River, Siberia, Russia; samples 19/10.25 (A, B), 19/11.75 (E, G–I), 19/12.75 (C, F), 19/25.5 (J, L), 20/2B (K), and 20/6B (D, M). A, B. Proximal stem plates of Rhombifera, SMNH Ec36873 and 36874, respectively. C–G. Edrioasteroid thecal plates (from basal attachment disc?), SMNH Ec36876–36880, respectively. H. Plate from edrioasteroid mouth-frame, SMNH Ec36881. I. Ambulacral flooring plate of Edrioasteroidea, SMNH Ec36875. I1, oblique view, a shallow pit for presumably insertion of a ligament for a cover-plate is arrowed; I2, upper view. J–L. Ctenidial plates (Echinodermata, Ctenocystoidea), SMNH Ec36882–36884. K1, plain view on a trapezoidal dorsal blade; K2, plain view of the plate showing dorsal blade and hook-shaped process; K3, plate in lateral view. M. Echinodermata, thecal frame-plate of unknown affinity, SMNH Ec36885. Scale bar: 1 mm (D, F, I, M) and 500 µm (A–C, E, G, H, J–L).
Fig. 59 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 59. Paleoscolecids Hadimopanella spp. from the Cambrian Erkeket (A–L, N–X) and Yunkyulyabit-Yuryakh (M) formations, Khorbusuonka River, Siberia, Russia; samples 19/31.75 (B, H–K, N, P–W), 19/43.25 (A, E–G, L, O), 19/70.5 (M), 20/5B (C, X), and 20/6B (D). A–X. Disarticulated sclerites, SMNH X11269–11292, respectively. A–D, F, G1, L, M2, S–V, X, apical; E, G2, K, M1, N–P, R, W2, oblique apical; Q, oblique basal; and W1, lateral views. Scale bar 100 µm.
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