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Fig. 54. Hyolithid operculum 2 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 54. Hyolithid operculum 2 from the lower Cambrian Erkeket Formation, Khorbusuonka River, Siberia, Russia; sample 19/33. A–D. SMNH X11226– 11229, respectively. A1, B1, D2, outer surface; A2, C2, lateral; A3, ventral; B2, oblique outer surface C1, C5, inner surface; C3, oblique lateral; and D1, C4, dorsal views. Scale bar: 250 µm (A, B, C1, D2) and 125 µm (C2–C5, D1).
Fig. 38 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 38. Sclerites of chancelloriid Archaeopetasus pachybasalis Kouchinsky sp. nov., from the lower Cambrian Tyuser Formation, lower reaches of the Lena River, Siberia, Russia; sample 21/21. A–H, J–L, P. Basal part of phosphatized sclerites, SMNH X11114–11125, respectively. A1, upper surface; A2, J2, oblique view on the upper surface; J1, L1, lateral view; C1, F1, lower surface; C2, F2, L2, oblique view on the lower surface of sclerites. I, M–O. Apical spines detached from the basal part of sclerites, SMNH X11126–11129, respectively. Scale bar 500 µm.
Fig. 44 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 44. Hyolith conchs Cupitheca sp., from the lower Cambrian Erkeket Formation, Khorbusuonka River, Siberia, Russia; samples 19/12.75 (E–I) and 19/33 (A–D). A, B, E–I. Phosphatised conchs, SMNH X11164–11170, respectively. A1, B3, lateral view; A2, close-ups of the apical end; B2, dorsal view. B1, enlarged apical end showing septum. E–H, fragments of conch with septum. I, probable operculum of the same species within apertural end of conch. C, D. Apical ends of conch, presumably of the same species, with initial parts preserved, SMNH X11171 and 11172, respectively. D1, oblique apertural view; D2, lateral view. Scale bar: 500 µm (A1, B2, B3, C), 250 µm (D, H, I), and 125 µm (A2, B1, E–G).
Fig. 41 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 41. Hyolith opercula from the lower Cambrian Tyuser Formation, lower reaches of the Lena River (A, B, G) and Erkeket Formation, Khorbusuonka River (C–F, H, I), Siberia, Russia; samples 11/16.05 (C, H), 11/16.1 (I), 11/2B (D–F), and 21/21 (A, B, G). A–I. Phosphatised opercula tentatively attributed to Conotheca mammilata Missarzhevsky in Rozanov et al., 1969, SMNH X11150–11158, respectively. A1, B1, C1, D1, inner surface; A2, ventral view; A3, lateral view; B2, oblique lateral view; A4, C2, oblique dorsal view on the opercula. Scale bar 500 µm.
Fig. 47 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 47. Hyolith opercula "Orthothecid operculum type A", from the lower Cambrian Tyuser Formation, lower reaches of the Lena River, Siberia, Russia; sample 21/21. A–H. Phosphatised opercula, SMNH X11182–11189, respectively. B1, outer surface; B2, oblique dorsal; D1, inner surface; and D2, oblique lateral views. Scale bar 500 µm.
Fig. 35 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 35. Sclerites of chancelloriids from the lower Cambrian Erkeket Formation, Khorbusuonka River (F–I) and Tyuser Formation, lower reaches of the Lena River (A–E, J–L), Siberia, Russia; samples 11/16.1 (F), 11/2B (G), 11/16.05 (H, I), and 21/21 (A–E, J–M). A–D, F–H, K. Stellispinella lenaica (Zhuravleva and Korde, 1955), sclerites with a central disk, SMNH X11081–11088, respectively. A1, plain view; A2, oblique lateral view. E, I, J. Stellispinella lenaica (Zhuravleva and Korde, 1955), sclerites without central disk, SMNH X11089–11091, respectively. I1, lateral view; I2, plain view. L, M. Diplospinella zintchenkoi Vasiljeva in Vasiljeva and Sayutina, 1988, SMNH X11092 and X11093, respectively. L1, L2, lateral view. Scale bar 500 µm.
Fig. 34 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 34. Sclerites of cambroclavids from the lower Cambrian Erkeket Formation, Khorbusuonka River, Siberia, Russia; samples 19/5.5 (I), 19/10.25 (A–E, J), 19/11.75 (K–T), and 20/1B (F–H). A–J. Cambroclavus sp., SMNH X11060–11069, respectively. A1, A2, B2, C2, E1, G1, I1, J2, view on the upper surface of sclerites; B1, C1, E2, G2, I2, J1, lateral view. K–T. Zhijinites clavus (Mambetov in Mambetov and Repina, 1979), SMNH X11070–11079, respectively. K1, view on the upper surface of sclerite; K2, lateral view. Scale bar: 500 µm (Q), 250 µm (A2, B–H, J–L, N, O, Q–T), 125 µm (A1, I, M, P).
Fig. 33 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 33. Sclerites of sachitid Halkieria proboscidea (Meshkova, 1969), from the lower Cambrian Erkeket Formation, Khorbusuonka River, Siberia, Russia; samples 11/16.05 (A, C, D, H, J, K, M, N), 11/2B (B, E, F, I, L, O), 11/16.1 (G). A–K. Cultrate sclerites, SMNH X11044–11054, respectively. A1, oblique lateral view; A2, oblique view on the upper surface of sclerite; A3, oblique view on the lower surface of sclerite; B1, C1, K2, views on the lower surface of sclerites; B2, C2, K1, lateral views. F, close-up of the sclerite and its internal mould. G, internal mould. L–O. Palmate sclerites, SMNH X11056–11059, respectively. Scale bar: 1 mm (A2, A3, B, F, G, I), 500 μm (A1, C, D, E, J, K, N, O), and 250 μm (H, L, M).
Fig. 32. Problematic shell 2 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 32. Problematic shell 2, from the lower Cambrian Erkeket Formation, Khorbusuonka River, Siberia, Russia; samples 19/11.75 (A–C, E) and 19/10.25 (D). A–E. Phosphatised fragments of shells with spines, SMNH X11039–11043, respectively. A1, D1, plain view; A2, lateral view of the shell fragment with cyanobacterial filaments (SMNH X11337, see Fig. 69A) attached to its inner side (bottom); A3, close-up showing spines; D2, lateral view. C, E, fragments of presumably subapical part of the shell. E1, E2, view on the same fragment, ca 90º rotated around the longitudinal axis. Scale bar: 250 µm (C, E), 165 µm (A1, A2, B1, D), and 50 µm (A3, B2).
Fig. 57 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 57. Paleoscolecid Hadimopanella knappologica (Bengtson, 1977) from the lower Cambrian Erkeket Formation, Khorbusuonka River, Siberia, Russia; samples 19/5.5 (A–F) and 20/1B (G–L). A–L. Disarticulated sclerites, SMNH X11245–11256, respectively. A, B2, D2, E–K, apical view; B1, C, D1, L, oblique apical view. Scale bar 100 µm. Type material: Disarticulated calcium phosphatic sclerites: Holotype Type horizon: Erkeket Formation, ca. 30 m below the Kuonamka For- SMNH X11257 (Fig. 58A) and paratypes SMNH X11258–11260, mation, Toyonian Stage (correlated with the Cambrian Stage 4). 11262–11265 (Fig. 58B–D, F–I), from the type locality and horizon. Type locality: Locality 19/31.75 (71°28.8'N, 123°50.0'E) on the left Material.—Several hundred calcium phosphate sclerites, in bank of the Khorbusuonka River, ca. 20 km downstream of the mouth addition to the type series, from samples 19/31.75, 19/33, of the Mattaia River, northern Siberia, Russia. 19/40, 19/43.25, 19/46.5, 20/5B, 20/6B, Khorbusuonka River,
Fig. 40 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 40. Hyolith conchs from the lower Cambrian Erkeket Formation, Khorbusuonka River (A–D, G, H, K–N) and Tyuser Formation, lower reaches of the Lena River (E, F, I, J), Siberia, Russia; samples 11/16.05 (K), 11/16.1 (A), 11/16.5 (B, C), 11/2B (D), 19/4.25 (H), 19/11.75 (L), 19/12.75 (M, N), 19/14.25 (G), 21/21 (I, J), and 21/51 (E, F). A, B. Conotheca mammilata Missarzhevsky in Rozanov et al., 1969, phosphatised conchs, SMNH X11136 and 11137, respectively. C, D. Conotheca mammilata Missarzhevsky in Rozanov et al., 1969, phosphatised conchs with initial part preserved, SMNH X11138 and 11139, respectively. E, F. Conotheca cf. longiconica (Qian, 1978), phosphatised conchs, SMNH X11142 and 11143, respectively. G, H. Conotheca circumflexa Missarzhevsky in Rozanov et al., 1969, phosphatised conchs, SMNH X11140 and 11141, respectively. H2, close-up showing transversal fibers in the wall. I–K. Egdetheca aldanica Missarzhevsky in Rozanov et al., 1969, calcium phosphatic internal moulds, SMNH X11144–11146, respectively. K1, lateral view; K2, apical view. L–N. Orthothecida sp. indet., calcium phosphatic internal moulds, SMNH X11147–11149, respectively. M1, lateral view; M2, dorsal view. Scale bar: 1 mm (A), 500 µm (B–D, G–K), 250 µm (E, F, L–N), and 50 µm (H2).
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.
Fig. 31. Problematic shell 1 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 31. Problematic shell 1, from the lower Cambrian Erkeket Formation, Khorbusuonka River, Siberia, Russia; sample 19/40. Internal mould with pitted surface, SMNH X11035; A1, upper; A2, sub-apical; A3, and A4, lateral views. Scale bar 250 µm.
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.
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