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Fig. 51 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 51. Phosphatised hyolith opercula from the lower Cambrian Sekten Formation, lower reaches of the Lena River (A–D) and Erkeket Formation, Khorbusuonka River (E–H), Siberia, Russia; samples 19/10.25 (E, H), 19/11.75 (F, G), and 22/50 (A–D). A, B. Parkula bounites Bengtson in Bengtson et al., 1990, SMNH X11207 and 11208, respectively. C, D. Hyolithid operculum 1, SMNH X11209 and X11210, respectively. E, H. Triplicatella sp., SMNH X11211 and X11212, respectively. F. Majatheca tumefacta Missarzhevsky in Rozanov et al., 1969, SMNH X11213. G. Triplicatella papilio Kouchinsky in Kouchinsky et al., 2015, SMNH X11214. A1, D2, inner surface; B1, C1, E3, H2, outer surface; A2, oblique lateral; B2, C2, D1, E1, H1, lateral; C3, E2, dorsal; and A3, C4, ventral views. Scale bar 500 µm.
Fig. 18 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 18. Paterinid brachiopod Dictyonina pannula (White, 1874) from the middle Cambrian Yunkyulyabit-Yuryakh Formation, Khorbusuonka River, Siberia, Russia; sample 19/92. A, B, D. Ventral valves, SMNH Br151265–151267, respectively. A1, B3, view on the external surface; A2, B1, lateral view; A3, oblique lateral view; B2, posterior view. C. Dorsal valve, SMNH Br151268. C1, posterior view; C2, external surface. Scale bar 500 µm.
Fig. 17. Paterinid brachiopod Olenekotreta olenekensis Ushatinskaya, 1997 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 17. Paterinid brachiopod Olenekotreta olenekensis Ushatinskaya, 1997 from the middle Cambrian Kuonamka Formation, Bol'shaya Kuonamka River, Siberia, Russia; sample 8/17.6. A, C, E. Ventral valves, SMNH Br151259–151261, respectively. B, D, F. Dorsal valves, SMNH Br151262–151264, respectively. Scale bar: 500 µm (A–D) and 250 µm (E, F).
Fig. 16 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 16. Paterinid brachiopod Pelmanotreta neguertchenensis (Pelman, 1977) from the lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River, Siberia, Russia; sample 7/27.5. A–E. Dorsal valves, SMNH Br151254–151258, respectively. A2,close-up of the brephic shell. Scale bar: 1 mm (A1, C–E) and 250 µm (A2, B).
Fig. 15 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 15. Lingulid brachiopod Acrothele olenekensis Pelman in Pelman and Pereladov, 1986 from the middle Cambrian Kuonamka Formation, Malaya Kuonamka and Bol'shaya Kuonamka rivers, Siberia, Russia; samples 1/22 (A, B, D), K1/17B (C), and 8/18.5 (E). A, B, D. Ventral valves, SMNH Br151249– 151251, respectively. A2, A3, close-ups showing brephic shell; D2, enlargement showing pits on the surface of brephic shell. C, E. Dorsal valves, SMNH Br151252 and 151253, respectively. E, dorsal valve of the brephic shell. Scale bar: 1 mm (A1, C, D1), 500 µm (B), 250 µm (A2, A3, E), and 25 µm (D2).
Fig. 1. Locality maps. A in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 1. Locality maps. A. Map of the Siberian Platform. B. Khorbusuonka River. Localities referred to in the main text: 96-1, 96-2, 96-3, Malaya Kuonamka (MK) and 96-6, 96-7, 96-8, Bol'shaya Kuonamka (BK) rivers, eastern flank of the Anabar Uplift; 3, 11, 15, 19, 20, Khorbusuonka River, Olenyok Uplift; 21, 22, Lena River lower reaches, Ulakhan-Ald'yarkhay Brook; Le, Lena River middle reaches, Tiktirikteekh and Bydyangaya Brooks; Al, Aldan River, between sections "Dvortsy" and UlakhanSulugur. Margin of the Siberian Platform is shown by a dashed line in A.
Fig. 14 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 14. Lingulid brachiopod Botsfordia caelata (Hall, 1847) from the Cambrian Emyaksin (F, G) and Kuonamka (A–E, H, I) formations, Malaya Kuonamka and Bol'shaya Kuonamka rivers, Siberia, Russia; samples K1/7B (A, B, H) and 1/9 (C–E, I) and 7/70 (F, G). A, B, F. Ventral valves, SMNH Br151240–151242, respectively. A1, A3, B2, close-ups showing brephic shell. C, D, G–I. Ventral valves, SMNH Br151243–151247, respectively. D2, enlargement showing brephic shell. E. Deformed specimen with both valves preserved, SMNH Br151248, view on the ventral valve. Scale bar: 1 mm (A2, B1, C, D1, E–I) and 250 µm (A1, A3, B2, D2).
Fig. 11 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 11. Lingulid brachiopod Homotreta cf. gorjanskii (Pelman, 1973) from the middle Cambrian Olenyok Formation, Malaya Kuonamka River, Siberia, Russia; sample 2/10. A–E. Ventral valves, SMNH Br151212–151216, respectively. A2, close-up of brephic shell, A3, enlargement showing pitted surface; E1, lateral view; E2, posterior view. F–K. Dorsal valves, SMNH Br151217–151222, respectively. G, brephic shell. Scale bar: 250 µm (A1, B–F, H–K), 125 µm (A3, G), and 12.5 µm (A2).
Fig. 7 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 7. Lingulid brachiopod Eoobolus variabilis (Pelman, 1977) from the Cambrian Emyaksin Formation, Bol'shaya Kuonamka River (A–C), Erkeket Formation, Khorbusuonka River (D–F), and Kuonamka Formation, Malaya Kuonamka River (G), Siberia, Russia; sample 7/70 (A–C), samples 19/4B, 19/66.5, 19/10.25 (D–F, respectively), and sample K1/7B (G). A, B. Ventral valves, SMNH Br151190 and 151191, respectively. C, D, F, G. Dorsal valves, SMNH Br151193–151196, respectively. F2, close-up showing brephic shell. E. Specimen with both valves preserved, view on the dorsal valve, SMNH Br151192. Scale bar: 1 mm (A–E, G), 500 µm (F1), 100 µm (F2).
Fig. 10 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 10. Lingulid brachiopod Homotreta gorjanskii (Pelman, 1973), SMNH Br151211, from the middle Cambrian Kuonamka Formation, Malaya Kuonamka River, Siberia, Russia; sample 1/28. A1, dorsal valve; A2, close-up of A1; A3, A4, enlargements of anterior margin with mantle canals. Scale bar: 500 µm (A1), 125 µm (A2), 60 µm (A3), 17 µm (A4).
Fig. 13 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 13. Lingulid brachiopod Linnarssonia bulcurica Pelman in Pelman and Pereladov, 1986 from the middle Cambrian Kuonamka Formation, Malaya Kuonamka and Bol'shaya Kuonamka rivers, Siberia, Russia; sample 1/16.5 (A–D, F, G) and sample 8/32 (E). A–C. Ventral valves, SMNH Br151233– 151235, respectively. A1, external surface; A2, lateral view; A3, close-up showing brephic shell. D, F, G. Dorsal valves, SMNH Br151237–151239, respectively. D2, close-up of the brephic shell; D3, enlargement with pits on the surface. E. Specimen with both valves preserved, SMNH Br151236. E1, external surface; E2, oblique lateral view. Scale bar: 1 mm (A1, A2, B, C, D1, E, F), 500 µm (G), 250 µm (A3, D2), and 12.5 µm (D3).
Fig. 9 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 9. Lingulid brachiopod Homotreta gorjanskii (Pelman, 1973) from the middle Cambrian Kuonamka Formation, Malaya Kuonamka and Bol'shaya Kuonamka rivers, Siberia, Russia; samples 8/22.5 (A), 8/23.1 (B, D), 8/18.5 (C, E), and 1/28 (F). A–F. Dorsal valves, SMNH Br151205–151210, respectively. F2, close-up showing brephic shell; F3, F4, enlargements with pits on the surface. Scale bar: 1 mm (A–D), 500 µm (F1), 250 µm (E), 60 µm (F2), 8 µm (F4), and 2.5 µm (F3).
Fig. 12 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 12. Lingulid brachiopod Homotreta aff. gorjanskii (Pelman, 1973) from the middle Cambrian Erkeket Formation, Khorbusuonka River, Siberia, Russia; sample 19/92. A. Specimen with both valves preserved, SMNH Br151223. A1, posterior view; A2, lateral view. B, D, E, I. Ventral valves, SMNH Br151224– 151227, respectively. I1, oblique posterior view, I2, inner surface. C, F–H, J. Dorsal valves, SMNH Br151228–151232, respectively. H1, inner surface; H2, oblique inner view; J2, close-up showing brephic shell. Scale bar: 500 µm (A–E, G, H, I1, J1), 250 µm (F, I2), and 60 µm (J2).
Fig. 8 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 8. Lingulid brachiopod Homotreta gorjanskii (Pelman, 1973) from the middle Cambrian Kuonamka Formation, Malaya Kuonamka and Bol'shaya Kuonamka rivers, Siberia, Russia; samples 1/28 (A, B) and 1/22 (H) and samples 8/14.8 (C, D), 8/18.5 (F), and 8/23.1 (E, G). A–D. Specimens with both valves preserved, SMNH Br151197–151200, respectively. A1, B1, lateral; A2, B3, D1, posterior; and B2, ventral views; C, D2, view on the ventral valve showing brephic shell. E–G. Ventral valves, SMNH Br151201–151203, respectively. H. Ventral valves, SMNH Br151204, sagittal cross-section showing lamination. Scale bar: 1 mm (E–G), 500 µm (H), 250 µm (A, B, D1), 125 µm (C), 60 µm (D2).
Fig. 6 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 6. Lingulid brachiopod Eoobolus variabilis (Pelman, 1977) from the middle Cambrian Kuonamka Formation, Bol'shaya Kuonamka River, Siberia, Russia, sample 8/23.1. A, B, D. Dorsal valves, SMNH Br151184–151186, respectively. A2, A3, close-ups of tuberculate surface. C. Ventral valve, SMNH Br151187. E, F. Specimens with both valves preserved, view on the ventral valve, SMNH Br151188 and 151189, respectively. Scale bar: 1 mm (A1, B–F), 250 µm (A3), 50 µm (A2).
Fig. 5 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 5. Lingulid brachiopod Eoobolus priscus (Poulsen, 1932) from the lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River, Siberia, Russia; samples 6/66.2 (A–I, L) and 7/55 (J, K). A–E, L. Ventral valves, SMNH Br151173–151177, 151272, respectively. E2, close up of E1; L2, L3, close-ups of the brephic shell. F–K. Dorsal valves, SMNH Br151178–151183, respectively. Scale bar: 1 mm (A–E1, F–K), 500 µm (L1), 250 µm (E2), 60 µm (L2), and 8 µm (L3).
Fig. 2 in Early-middle Cambrian stratigraphy and faunas from northern Siberia
Fig. 2. Stratigraphic columns of sections 96-1 and 96-2, Malaya Kuonamka River and section 96-8, Bol'shaya Kuonamka River, Siberia, Russia (after Kouchinsky et al. 2011: fig. 2). Arrows with numbers indicate derivation of fossiliferous samples. Botoman Stage is correlated herein with the Cambrian Stage 4, in accordance with Geyer (2019). Asterisk A, indicates occurrences of Davidonia anabarica, Enigmaconus? pyramidalis, Pelagiella sp. 1 and 2, Majatheca tumefacta, Tetratheca clinisepta, "Lenatheca groenlandica", Conotheca cf. mammilata, Parkula cf. esmeraldina (see Kouchinsky et al. 2015a). Asterisk B, indicates occurrences of Anabaroconus sibiricus, Eotebenna viviannae, Kuonamkaella oliva, Leptostega cf. hyperborea, Pelagiella sp. cf. Cambretina mareki, Pelagiella sp. cf. Costipelagiella zazvorkai, Pojetaia dentifera, Protowenella sp., Pseudomyona queenslandica, and Yochelcionella angustiplicata (see Gubanov et al. 2004b and Kouchinsky et al. 2011). Abbreviations: Ac., Acadoparadoxides; An., Anabaraspis; B., Bergeroniellus expansus; P., Paramicmacca; Fm., Formation; H., Homotreta; O-S, Ovatoryctocara–Schistocephalus; T., Triplagnostus.
Fig. 8 in Femoral histology and growth patterns of the ceratopsian dinosaur Psittacosaurus sibiricus from the Early Cretaceous of Western Siberia
Fig. 8. Histological sections of femur KOKM 4652/13 of the ceratopsian dinosaur Psittacosaurus sibiricus Voronkevich and Averianov in Leshchinskiy et al., 2000, from the Lower Cretaceous Ilek Formation (Shestakovo 3 locality) of Western Siberia, Russia; adult stage, about 100% of maximal femoral size. Histological overview of the cortex (A1) and close-ups of the cortex under polarized light with lambda waveplate (A2, A3). Note moderately vascularized cortex that is predominantly composed of parallel-fibred bone and the predominantly longitudinal orientation of vascular canals. Abbreviations: eb, erosion bays; lvc, longitudinal vascular canals; mc, medullary cavity; pfb, parallel-fibred bone; retvc, reticular vascular canals; sb, secondary bone; tb, trabeculae.
Fig. 7 in Femoral histology and growth patterns of the ceratopsian dinosaur Psittacosaurus sibiricus from the Early Cretaceous of Western Siberia
Fig. 7. Histological sections of femur KOKM 4652/9-10 of the ceratopsian dinosaur Psittacosaurus sibiricus Voronkevich and Averianov in Leshchinskiy et al., 2000, from the Lower Cretaceous Ilek Formation (Shestakovo 3 locality) of Western Siberia, Russia; adult stage, about 90% of maximal femoral size. Histological overview of the cortex (A1, A2) and close-ups of the cortex (A3, A4) under polarized light with lambda waveplate. Note the parallelfibred bone in the outermost part of the cortex. Abbreviations: eb, erosion bays; lvc, longitudinal vascular canals; mc, medullary cavity; pb, primary bone; pfb, parallel-fibred bone; retvc, reticular vascular canals; sb, secondary bone; so, secondary osteon; tb, trabeculae.
Fig. 6 in Femoral histology and growth patterns of the ceratopsian dinosaur Psittacosaurus sibiricus from the Early Cretaceous of Western Siberia
Fig. 6. Histological sections of femora KOKM 4652/1 (A) and KOKM 4652/11 (B) of the ceratopsian dinosaur Psittacosaurus sibiricus Voronkevich and Averianov in Leshchinskiy et al., 2000, from the Lower Cretaceous Ilek Formation (Shestakovo 3 locality) of Western Siberia, Russia; subadult stage; about 63–70% of maximal femoral size. Histological overview of the cortex (A1, B1) under polarized light with lambda waveplate and without lambda waveplate (A3) and close-ups of the cortex (A2, A4, B2) under polarized light with lambda waveplate. Note the presence of the fibrolamellar complex and four LAGs (white arrows). Abbreviations: eb, erosion bays; lvc, longitudinal vascular canals; mc, medullary cavity; retvc, reticular vascular canals; sb, secondary bone; tb, trabeculae. subadults indicate a continuing period of fast growth with a The femur KOKM 4652/11 (about 63% of maximal femocyclical temporary and local decrease in growth rate. ral size; Fig. 6B) is poorly preserved, but reticular canals and
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