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Fig. 68. Problematicum Coleoloides Walcott, 1889 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 68. Problematicum Coleoloides Walcott, 1889, internal moulds of tubes, from the lower Cambrian Erkeket (C, D), Tyuser (M), and Pestrotsvet (A, B, E–L) formations, Siberia, Russia; samples 11/2B (C) and 11/16.1 (D) from Khorbusuonka River; sample 21/22 (M) from lower reaches of Lena River; sample M303/2 (B, H, J, L) from Tiktirikteekh Brook (Rozanov et al. 1969: 31, text-fig. 6), sample 171–174 (E) from Bydyangaya Brook (Val'kov 1982: 27, textfig. 8) middle reaches of the Lena River, sample 479a (K) from section "Dvortsy", Aldan River, and sample 510 (A, F, G, I) from section Ulakhan-Sulugur, Aldan River (Fig. 1). A–C, K–M. Coleoloides trigeminatus Missarzhevsky in Rozanov et al., 1969, SMNH X11324–11329, respectively. D. Coleoloides sp., SMNH X11330. E–J. Coleoloides cf. paucistriatus Poulsen, 1967, SMNH X11331–11336, respectively. A1, B2, C2, E1, F2, G1, H2, I1, L2, lateral view; A2, B1, C1, F1, H1, L1, transversal view; E2, G2, I2, transversal view in the apical part. Scale bar: 500 µm (M) and 250 µm (A–L).
Fig. 67 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 67. Anabaritids, internal moulds (A–F) and other problematic tubes G–I) from the lower Cambrian Kessyusa Group (B–D, H, I) and Erkeket Formation (A, E–G), Khorbusuonka River, Siberia, Russia; samples 11/16.05 (A), 11/2B (E, F), 15/23 (B–D, H, I), and 20/1B (G). A. Anabarites tristichus Missarzhevsky in Rozanov et al., 1969, SMNH X11315. A1, transversal view of the tube; A2, lateral view. B. Anabarites hexasulcatus (Missarzhevsky, 1974), SMNH X11316. C. Selindeochrea ternaria Missarzhevsky in Rozanov et al., 1969), SMNH X11317. D. Cambrotubulus sp., SMNH X11318. E, F. Anabarites korobovi (Missarzhevsky in Rozanov and Missarzhevsky, 1966), SMNH X11319 and 11320, respectively. G. Coleolella billinsi (Sysoev, 1962), SMNH X11321. H, I. Platysolenites antiquissimus Eichwald, 1860, SMNH X11322 and 11323, respectively. Scale bar: 250 µm (A) and 500 µm (B–I).
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).
Fig. 65 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 65. Calcium phosphatic tubes of hyolithelminths from the lower Cambrian Erkeket Formation, Khorbusuonka River (A–C, G–J) and Tyuser Formation, lower reaches of the Lena River (D–F, K, L), Siberia, Russia; samples 11/19.5 (B, C), 19/3.25 (H, J), 19/4.25 (I), 19/5.5 (G), 19/16 (A), 21/21 (D, E, K), and 21/22 (F, L). A, F, H. Hyolithellus sp., SMNH X11299–11301, respectively. B–E. Hyolithellus isiticus Missarzhevsky in Rozanov et al., 1969, SMNH X11295–11298, respectively. G, I–L. Torellella spp., SMNH X11302–11306, respectively. Scale bar: 1 mm (D, L), 500 µm (A–C, E, F, H, I–K), and 250 µm (G).
Fig. 58 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 58. Paleoscolecid Hadimopanella foveata sp. nov., from the lower Cambrian Erkeket Formation, Khorbusuonka River, Siberia, Russia; samples 19/31.75 (A–D, F–I), 19/43.25 (E, J, N, O), 20/5B (L, M), and 20/6B (K). A–O. Disarticulated sclerites, SMNH X11257–11268, 11352–11354, respectively. A, holotype. A1, B–D, G, H, O, oblique apical view; A2, E, F, I–N, apical view. Scale bar 100 µm.
Fig. 61 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 61. Lobopodian (A) and bradoriid (B–D) calcium phosphatic fragments, from the lower Cambrian Erkeket Formation, Khorbusuonka River (B, C) and Tyuser (D), and Sekten (A) formations, lower reaches of the Lena River, Siberia, Russia; samples 19/3.25 (C), 19/31.75 (B), 21/57.75 (D), and 22/67 (A). A. Microdictyon robisoni Bengtson, Matthews, and Missarzhevsky, 1986, sclerite, SMNH X11294. B. Mongolitubulus spinosus (Hinz, 1987), spine, SMNH Ar75002. C. Mongolitubulus reticulatus Kouchinsky, Bengtson, Clausen, Gubanov, Malinky, and Peel, 2011, spine, SMNH Ar75003. D. Cambria sibirica Neckaja and Ivanova, 1956, carapace, SMNH Ar75001; D1, anterior view; D2, D3, dorsal view. Scale bar: 250 µm A–C) and 1.25 mm (D).
Fig. 64 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 64. Thecal plates of Echinodermata from the lower Cambrian Erkeket Formation of Khorbusuonka River (B, C, E–O) and the middle Cambrian Sekten Formation, lower reaches of the Lena River (A, D), Siberia, Russia; samples 19/11.75 (O), 19/12.75 (J), 20/2B (I, K–M), 20/5B (B, C, F, G, N), 20/6B (E, H), and 22/67 (A, D). A–O. Thecal plates, SMNH Ec36886–36900, respectively. Scale bar 500 µm.
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.
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