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FIG. 9 in Arthropods from the Lower Devonian Severnaya Zemlya Formation of October Revolution Island (Russia)
FIG. 9. — Interpretative drawings of the specimens shown in Fig. 8; A-C, E-G, Octoberaspis ushakovi n. gen., n. sp., A, No. 35/735; B, No. 35/707; C, No. 35/339; E, No. 35/379; F, No. 35/713 (juvenile); G, No. 35/719 (juvenile); D, Chasmataspida incertae sedis, No. 35/714. Abbreviations: ap, prosomal appendage; cp, carapace; cr, marginal carapace rim; ep, epimera of pretelsonic segment; gs, genal spine; le, lateral eyes; me, median eyes; od, opisthosomal doublure where tergites tuck round onto ventral surface; pd, paddle (prosomal appendage VI?); pra, preabdomen; poa, postabdomen; tl, telson; vp, ventral plate underlying tergites. Scale bars: 5 mm.
FIG. 11. — A-Q, T, U, W in Conodonts in the Silurian of Severnaya Zemlya and Sedov archipelagos (Russia), with special reference to the genus Ozarkodina Branson & Mehl, 1933
FIG. 11. — A-Q, T, U, W, Ozarkodina? aff. waugoolaensis Bischoff, 1986; A, B, E, Cn 6045, lateral and lower views of Pa element (B in translucent light); C, Cn 6057, posterior view of Sb element; D, G, K, Cn 6044, lateral and lower views of Pa element (G in translucent light); F, J, P, Cn 6046, lateral and lower views of Pa element (P in translucent light); H, Cn 6053, posterior view of Sb element; I, Cn 6050, lateral view of M element; L, O, Cn 6047, lateral and lower views of Pb element; M, Cn 6051, lateral view of Sc element; N, Cn 6055, posterior view of Sa element with denticulated posterior process; Q, Cn 6049, lateral view of M element; T, W, Cn 6047, lateral views of Pb element (W in translucent light); U, Cn 6057, posterior view of Sa element without posterior process; all specimens from the lowermost part of the Samojlovich Formation, Srednij Island, section 1(79), sample MF 1-1; R, S, V, Ozarkodina waugoolaensis Bischoff, 1986, Cn 6082, lateral and lower views of Pa element (S in translucent light); uppermost part of the Srednij Formation, October Revolution Island, Ushakov River, section 32, sample MF 46-20. Scale bar: 0.5 mm.
FIG. 8. — A-D, G, J in Conodonts in the Silurian of Severnaya Zemlya and Sedov archipelagos (Russia), with special reference to the genus Ozarkodina Branson & Mehl, 1933
FIG. 8. — A-D, G, J, Ozarkodina guiyangensis Zhou, Zhai & Xian, 1981; A, B, G, Cn 5981, lateral and lower views of Pa element (A in translucent light); C, D, Cn 5983, lateral and lower views of Pa element; J, Cn 5980, lateral view of Pa element in translucent light; all elements from the lower part of the Golomyannyj Formation, October Revolution Island: A, B, G, J, from Strojnaya River, section 52, sample MF 52-23; C, D from Ushakov River, section 32, sample MF 46-14; E, F, Ozarkodina aldridgei Uyeno & Barnes, 1983, specimen Cn 5960, lateral and lower views of Pa element; from the lower part of the Vodopad Formation, October Revolution Island, Strojnaya River, section 51, sample MF 51-9; H, I, K, M-P, R-T, Ozarkodina sp. A.; H, N, Cn 5971, lateral and lower views of Pa element; I, K, Cn 5973, lateral and lower views of Pa element; M, O, Cn 5972, lateral and lower views of Pa element; P, Cn 5974, lateral view of Pb element; R, Cn 5975, lateral view of M element; S, Cn 5977, posterior view of Sa element, T, Cn 5976, posterior view of Sb element; all specimens from the lowermost part of the Vodopad Formation, October revolution Island, Strojnaya River, section 51, sample MF 51-3; L, Q Ozarkodina confluens bucerus (Viira, 1983); L, Cn 6091, lateral view of Pa element; Q, Cn 6089, lateral view of Pa element; both specimens from the upper part of the Samojlovich Formation, October Revolution Island: L, from Matusevich River, section 2, sample 5-2-68k; Q, from the Spokojnaya River region, section 157, sample MF 157-6. Scale bar: 0.5 mm.
FIG. 7. — A-F in Conodonts in the Silurian of Severnaya Zemlya and Sedov archipelagos (Russia), with special reference to the genus Ozarkodina Branson & Mehl, 1933
FIG. 7. — A-F, Ozarkodina polinclinata estonica Männik, 1992; A, D, Cn 5992; lateral view of Pa element (D in translucent light); B, Cn 5988, lateral view of Pa element; C, Cn 5995, lateral view of Sc element; E, Cn 5993, lateral view of Pb element; F, Cn 5998, lateral view of M element; all specimens from the middle part of the Srednij Formation, Srednij Island: A, C-E, from section 1(79), sample MF 1-12a; B, from section 1(79), sample MF 2-1; F, from section 5(74), sample 5-3 (74); G, J, Ozarkodina aldridgei Uyeno & Barnes, 1983, specimen Cn 5957, lateral and lower views of Pa element, from the lower part of the Vodopad Formation, October Revolution Island, Strojnaya River, section 51, sample MF 51-9; H, I, K, L, Ozarkodina guiyangensis Zhou, Zhai & Xian, 1981; H, K, Cn 5980; lateral and lower views of Pa element; I, L, Cn 5985, lateral views of Pb element (L in translucent light); all specimens from the lower part of the Golomyannyj Formation, October Revolution Island; H, K, from Strojnaya River, section 52, sample MF 52-23; I, L, from Ushakov River, section 32, sample MF 46-14. Scale bar: 0.5 mm
FIG. 9. — A-C in Conodonts in the Silurian of Severnaya Zemlya and Sedov archipelagos (Russia), with special reference to the genus Ozarkodina Branson & Mehl, 1933
FIG. 9. — A-C, Ozarkodina aff. waugoolaensis Bischoff, 1986, Cn 6075, lateral and lower views of Pa element (C in translucent light), upper part of the Srednij Formation, October Revolution Island, Ushakov River, section 32, sample MF 46-19; D-M, Ozarkodina waugoolaensis Bischoff, 1986; D, E, Cn 6059, lower and lateral views of Pa element; F, H, I, Cn 6058, lower and lateral views of Pa element (I in translucent light); G, L, M, Cn 6072, lower and lateral views of Pa element (M in translucent light); J, K, Cn 6040, lateral views of Pb element (K in translucent light); D-F, H, I, from the lowermost part of the Srednij Formation, October Revolution Island, Strojnaya River, section 53, sample MF 53-10; G, (L-M), from the middle part of the Golomyannyj Formation, October Revolution Island, Ushakov River, section 32, sample MF 46-14; J, K, from the lowermost part of the Srednij Formation, Srednij Island, section 1(79), sample MF 2-10. Scale bar: 0.5 mm.
FIG. 5 in Conodonts in the Silurian of Severnaya Zemlya and Sedov archipelagos (Russia), with special reference to the genus Ozarkodina Branson & Mehl, 1933
FIG. 5. — Distribution of selected conodont taxa. Outcrops on the Matusevich River, October Revolution Island. For location of outcrops refer to Männik et al. 2002: figs 1, 2, 4. See also explanations to Fig. 1.
FIG. 4 in Conodonts in the Silurian of Severnaya Zemlya and Sedov archipelagos (Russia), with special reference to the genus Ozarkodina Branson & Mehl, 1933
FIG. 4. — Distribution of selected conodont taxa. Outcrops on the Ushakov River, October Revolution Island. For location of outcrops refer to Männik et al. 2002: figs 1, 6. See also explanations to Fig. 1.
FIG. 3 in Conodonts in the Silurian of Severnaya Zemlya and Sedov archipelagos (Russia), with special reference to the genus Ozarkodina Branson & Mehl, 1933
FIG. 3. — Distribution of selected conodont taxa; A, outcrops in the Spokojnaya River region, October Revolution Island; B, composite sequence from the northern part of Pioneer Island: numbers in the left column indicate to the beds and in the right to the thicknesses of these beds according to Klubov et al. 1980. For location of outcrops refer to Männik et al. 2002: figs 1, 9. See also explanations to Fig. 1.
FIG. 2 in Conodonts in the Silurian of Severnaya Zemlya and Sedov archipelagos (Russia), with special reference to the genus Ozarkodina Branson & Mehl, 1933
FIG. 2. — Distribution of selected conodont taxa; A, outcrops on the Strojnaya River, October Revolution Island; B, sections in the Obryvistaya River region, October Revolution Island. For location of outcrops refer to Männik et al. 2002: figs 1, 6. See also explanations to Fig. 1.
FIG. 1 in Conodonts in the Silurian of Severnaya Zemlya and Sedov archipelagos (Russia), with special reference to the genus Ozarkodina Branson & Mehl, 1933
FIG. 1. — Distribution of selected conodont taxa. Outcrops on Srednij Island, Sedov Archipelago. To the left of the thick vertical line are shown the thicknesses of formations, and the ranges and numbers of separate outcrops studied; to the right of it: location and numbers of samples. The names of the Ozarkodina species are given in bold. For location of outcrops refer to Männik et al. 2002: fig. 1.
FIG. 23. — A-F in Upper Silurian thelodonts from Severnaya Zemlya Archipelago (Russia)
FIG. 23. — A-F, Thelodus sp. indet., morphological set of scales; A-D, head scales; E, F, trunk scales; A, B1, C1, D1, E1, F, scales in crown view; B2, C2, E2, scales in base view; E3, scale in lateral view; D2, scale in posterior view; A-F, LIG 35-079-LIG 35-084; sample 5m, Pioneer Island, Ludlow, Upper Silurian; G-M, Thelodus ex gr. schmidti (Pander, 1856), trilobatiform trunk scales in crown view, LIG 35-113-LIG 35-119; sample 8d-1, Pioneer Island, Ludlow, Upper Silurian. Scale bar: 0.3 mm.
FIG. 22 in Upper Silurian thelodonts from Severnaya Zemlya Archipelago (Russia)
FIG. 22. — Thelodus ex gr. schmidti (Pander, 1856), morphological set of scales; A, B, head scales; C, D, trunk scales of type "A"; E-G, trunk scales of type "B"; H, J-O, S, T, trunk scales of type "C"; I, P-R, modified trunk scales; A1, B, C1, D-G, H1, I1, J, K1, L, M, N1, O-Q, scales in crown view; H2, I2, K2, N2, scales in base view; A2, S2, scales in lateral view; C2, scale in posterior view; A-T, LIG 35-055-LIG 35-077; sample 5m, Pioneer Island, Ludlow, Upper Silurian. Scale bar: 0.3 mm.
FIG. 12. — Valiukia flabellata n. gen., n in Upper Silurian thelodonts from Severnaya Zemlya Archipelago (Russia)
FIG. 12. — Valiukia flabellata n. gen., n. sp., morphological set of scales; A, B, head scales; C-F, transitional scales; G-J, trunk scales; posterior ends of the crown are restored; G, holotype, LIG 35-844 (see also Fig. 14A, B); A-J, LIG 35-838-LIG 35-847; sample 2-23, Matusevich River, October Revolution Island, Ust-Spokojnaya Formation, Ludlow, Upper Silurian. Abbreviations: b, base; c, central (medial) part of the crown; cr, crown; lsp, longitudinal spine of posterior part of the crown. Scale bars: 0.1 mm.
FIG. 19 in Upper Silurian thelodonts from Severnaya Zemlya Archipelago (Russia)
FIG. 19. — Microstructure of the scales; A-D, Thelodus visvaldi n. sp.; E, F, Thelodus sp. indet.; A, Pi 7644; B, Pi 7645; C, Pi 7646; D, Pi 7647; E, Pi 6445; F, Pi 6365; A, C, sample 20568, Komsomolets Island, upper part of Ludlow; B, sample 2-3k; D, MF 11-1, Matusevich River, October Revolution Island, Ust-Spokojnaya Formation; E, F, sample 2055zh, Pioneer Island, upper part of Ludlow, Upper Silurian. Abbreviations: b, base; cr, crown; dt, dentine tubules; n, neck; pcv, pulp cavity; rcr, ridge on the crown. Scale bars: 0.1 mm.
FIG. 1 in Upper Silurian thelodonts from Severnaya Zemlya Archipelago (Russia)
FIG. 1. — Distribution of thelodonts in the Silurian section of Pioneer Island; 1, sandstone; 2, sandstone and silty sandstone; 3, argillite; 4, biomorphic limestone; 5, dolomite; 6, dolomitic limestone; 7, oolitic limestone; 8, stromatoporoidal limestone (after Klubov et al. 1980: fig. 2; modified). Cyrillic letters in fig. 2 of Klubov et al. 1980 are in present paper transliterated as follows: A = a; Б = b; B = v; г = g; д = d; E = e; 3 = zh; и = i; K = k; M = m; H = kh.
FIG. 16 in Upper Silurian thelodonts from Severnaya Zemlya Archipelago (Russia)
FIG. 16. — Goniporus alatus (Gross, 1947), morphological set of scales; A, head scale; B-D, transitional scales; E-Q, trunk scales; A-G1, H, I1, J-L1, M1, N, O1, P1, Q, scales in crown view; G2, I2, L2, M2, O2, P2, scales in base view. LIG 35-236-LIG 35-252; sample 41-1, Spokojnaya River, October Revolution Island, Krasnaya Bukhta Formation, Pridoli, Upper Silurian. Scale bar: 0.3 mm.
FIG. 15. — Valiukia flabellata n. gen., n in Upper Silurian thelodonts from Severnaya Zemlya Archipelago (Russia)
FIG. 15. — Valiukia flabellata n. gen., n. sp., microstructure of trunk scales in sagittal view (scale in anise oil); A, LIG 35-856; B, LIG 35-857; C, LIG 35-858. Abbreviations: b, base; c, central (medial) part of the crown; lsp, longitudinal spine of posterior part of the crown; mpc, main pulp canal; pc, pulp canal in lateral spine; sample 2-23, Matusevich River, October Revolution Island, Ust-Spokojnaya Formation, Ludlow, Upper Silurian. Scale bar: 0.1 mm.
FIG. 21 in Upper Silurian thelodonts from Severnaya Zemlya Archipelago (Russia)
FIG. 21. — Thelodus ex gr. schmidti (Pander, 1856), morphological set of scales; A-F, K, N, head scales; G, H, trunk scales of type "A"; I, J, L, M, trunk scales of type "B"; O-X, trunk scales of type "C"; A, C-X, scales in crown view; B, scale in lateral view; LIG 35- 254-LIG 35-277. Scale bar: 0.3 mm.
FIG. 8. — Paralogania menneri n in Upper Silurian thelodonts from Severnaya Zemlya Archipelago (Russia)
FIG. 8. — Paralogania menneri n. sp., morphological set of scales; A, B, head scales; C-G, transitional scales; H-O, transitional(?) scales; P-X, trunk scales; A-H1, I-X, scales in crown view; H2, a scale in base view; A-X, LIG 35-194-LIG 35-217; sample 47-14, Spokojnaya River, October Revolution Island, Ust-Spokojnaya Formation, Ludlow, Upper Silurian. Scale bar: 0.5 mm.
FIG. 4 in Upper Silurian thelodonts from Severnaya Zemlya Archipelago (Russia)
FIG. 4. — Set of scales of Paralogania ex gr. martinssoni (Gross, 1967); A, head scale; B-J, O, transitional scales; K-N, P, R-Z, trunk scales; Q, fin scale; A-D, E1, F-J, L, N-T1, U, V1, W1, Y, Z, scales in crown view; E2, K, M, V2, scales in lateral view; T2, W2, X, scales in base view; A, LIG 35-007; B, LIG 35-001; C, LIG 35-002; D, LIG 35-005; E, LIG 35-006; F, LIG 35-008; G, LIG 35-009; H, LIG 35- 010; I, LIG 35-0013; J, LIG 35-031; K, LIG 35-016; L, LIG 35-017; M, LIG 35-014; N, LIG 35-021; O, LIG 35-012; P, LIG 35-023; Q, LIG 35-024; R, LIG 35-022; S, LIG 35-025; T, LIG 35-019; U, LIG 35-018; V, LIG 35-028; W, LIG 35-029; X, LIG 35-030; Y, LIG 35- 033; Z, LIG 35-032; A-I, K-W, sample 8d-1, Pioneer Island, Ludlow, Upper Silurian; J, X-Z, sample 5m-1, Pioneer Island, Ludlow, Upper Silurian. Scale bar: 0.5 mm.
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