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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.
Fig. 53 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 53. Hyolith conchs Parakorilithes mammillatus He and Pei in He et al., 1984, from the lower Cambrian Erkeket Formation, Khorbusuonka River, Siberia, Russia; sample 19/10.25. A–D. Phosphatised conchs, SMNH X11223–11225, and 11351 respectively. B1, C1, dorsal; B2, D2, lateral; B3, oblique lateral; C2, B4, apertural; and D1, oblique apertural views. Scale bar 250 µm.
Fig. 60 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 60. Scalidophoran Markuelia secunda Val'kov in Val'kov and Karlova, 1984 from the Cambrian Erkeket Formation, Khorbusuonka River, Siberia, Russia; sample 11/16.05. Phosphatized enrolled embryo in different views (A1–A3), SMNH X11293. Scale bar 250 µm.
Fig. 45 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 45. Hyolith opercula, presumably Cupitheca sp. (see Fig. 44), from the lower Cambrian Erkeket Formation, Khorbusuonka River, Siberia, Russia; sample 19/12.75. A–E. Phosphatised opercula, SMNH X11173–11177, respectively. A1, C1, outer surface; A2, lateral view; C2, oblique dorsal view; D1, inner surface; D2, oblique lateral view. Scale bar 250 µm.
Fig. 48 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 48. Hyolith opercula "Orthothecid operculum type B", from the lower Cambrian Erkeket Formation, Khorbusuonka River (A, C–F) and Tyuser Formation, lower reaches of the Lena River (B), Siberia, Russia; samples 11/16.5 (A, C, F), 11/2B (D, E), and 21/21 (B). A–D. Phosphatised opercula, SMNH X11190–11193, respectively. E, F. Phosphatised opercula of presumably the same species, SMNH X11194 and 11195, respectively. A1, D3, F2, outer surface; A2, B2, F3, oblique lateral; D2, E2, lateral; A3, D1, F1, dorsal; B1, E1, inner surface views. Scale bar: 500 µm (A–E, F2, F3) and 250 µm (F1).
Fig. 52 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 52. Hyolith conchs from the lower Cambrian Erkeket Formation, Khorbusuonka River (C, D, F–H) and Tyuser (A, B) and Sekten (E) formations, lower reaches of the Lena River, Siberia, Russia; samples 19/12.75 (D, F, G), 19/25.5 (H), 19/33 (C), 21/51 (A, B), and 22/50 (E). A, B, D, F–H. Microcornus cf. eximius Duan, 1984, phosphatised conchs (A, B) and calcium phosphatic internal moulds (D, F, G), SMNH X11215–11220, respectively. C, E. Parkula bounites? Bengtson in Bengtson et al., 1990, phosphatised conchs, SMNH X11221–11222, respectively. B1, C2, D2, F3, oblique apertural, B2, C1, D1, F1, G1, dorsal; and D3, F2, G2, lateral views; E, enlargement showing inner surface of ventral side of a fragmentary conch. Scale bar: 500 µm (A–D, F–H) and 250 µm (E).
Fig. 29 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 29. Pelagiellid mollusc Aldanella sibirica Parkhaev and Karlova, 2011, from the lower Cambrian Tyuser Formation, lower reaches of the Lena River (A) and Erkeket Formation, Khorbusuonka River (B), Siberia, Russia; samples 21/21 (A) and 11/16.1 (B). A. Phosphatised shell, SMNH Mo194736. A1, A2, enlargements showing protoconch; A3, adapical view; A4, oblique adapical view. B. External mould, SMNH Mo194737, with sculpture of the shell surface. Scale bar: 250 µm (A3, A4), 125 µm (A1, A2, B).
Fig. 49 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 49. Hyolith opercula "Orthothecid operculum type C", from the lower Cambrian Erkeket Formation, Khorbusuonka River (A–D) and Tyuser Formation, lower reaches of the Lena River (E–G), Siberia, Russia; samples 11/2B (A–D) and 21/21 (E–G). A–G. Phosphatised opercula, SMNH X11196–11202, respectively. E1, inner surface and transverse broken view; E2, enlargement showing fibrous composition of the wall; F1, ventral view; A1, C1, F2, outer surface; A2, C3, dorsal view; A3, lateral view; C2, oblique lateral view; D1, oblique inner surface view; D2, enlargement showing pitted inner surface. Scale bar: 500 µm (A, C, D1, E1, F) and 250 µm (B, D2, E2, G).
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