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870 results for “Ordovician”
FIG. 6. — Prasopora spjeldnaesi n in New Monticuliporidae (Bryozoa, Trepostomata) from the Cystoid Limestone Formation (Upper Ordovician) of the Iberian Chains (NE Spain)
FIG. 6. — Prasopora spjeldnaesi n. sp., holotype (MPZ 2006/99): A, general view of the colony; B, surface of the colony showing autozooecia (az) completely surrounded by mesozooecia (mz), and a cross section of a cystiphragm (cy) inside an autozooecial aperture; C, tangential thin section with abundant mesozooecia (mz) completely isolating autozooecia (az); D, longitudinal thin section showing the autozooecia (az) and mesozooecia (mz) as well as the peculiar cystiphragms (cy); E, a group of mesozooecia (mz) with their diaphragms (dp) at the same level forming a square network. Scale bars: 1 mm.
FIG. 1 in Dignomia munsterii (Brachiopoda, Lingulata) from the Ordovician of Bolivia, with redescription of the genus
FIG. 1. — Maps of Bolivia showing the distribution of the Ordovician (from Pareja & Ballon 1978).
FIG. 3 in Dignomia munsterii (Brachiopoda, Lingulata) from the Ordovician of Bolivia, with redescription of the genus
FIG. 3. — Dignomia munsterii: A, B, ventral valves; A, internal face; B, C, external faces; D-F, dorsal valves; D, internal face; E, F, external faces. Scale bars: 2 mm.
FIG. 15. — Thelodus calvus n in Ordovician and Lower Silurian thelodonts from Severnaya Zemlya Archipelago (Russia)
FIG. 15. — Thelodus calvus n. sp., microstructure of the scales; A, Pi 7631; B, Pi 7632; C, D, Pi 7633; E, Pi 7634; F, Pi 7635; G, Pi 7636; sample MF 46-23, Ushakov River, October Revolution Island, Samojlovich Formation, Wenlock, Lower Silurian. Abbreviations: asp, aspidine "pegs" in the base; b, base; cr, crown; dc, dentine canal; dt, dentine tubules; n, neck, pc, pulp canal; pcv, pulp cavity. Scale bars: 0.1 mm.
FIG. 11. — Paralogania consimilis n in Ordovician and Lower Silurian thelodonts from Severnaya Zemlya Archipelago (Russia)
FIG. 11. — Paralogania consimilis n. sp.; A-C, head scales; D, G, transitional scales; E, F, H-T, trunk scales; A-D, F-M, O, Q, R, scales in crown view; E, N, P, scales in lateral view; A, Pi 7510; B, Pi 6808; C, Pi 7508; D, Pi 7509; E, Pi 7507; F, Pi 6806; G, Pi 7514; H, Pi 7506; I, Pi 6816; J, Pi 6809; K, Pi 7511; L, Pi 6810; M, N, Pi 7512; O, P, holotype Pi 7515; Q, Pi 6813; R, Pi 6817; S, Pi 7513; T, Pi 6811; sample MF 46-23, Ushakov River, October Revolution Island, upper part of Samojlovich Formation, Wenlock, Lower Silurian. Scale bars: 0.1 mm.
FIG. 14 in Ordovician and Lower Silurian thelodonts from Severnaya Zemlya Archipelago (Russia)
FIG. 14. — Set of scales of Thelodus calvus n. sp.; A, B, LIG 35-180; C, D, LIG 35-181; E, LIG 35-182; F, LIG 35-183; G, LIG 35-184; H, LIG 35-185; I, LIG 35-186; J, LIG 35-187; K, L, LIG 35-188; M, LIG 35-191; N, LIG 35-192; O, P, LIG 35-189; Q, LIG 35-190; R, LIG 35-193; sample 32a-208, Ushakov River, October Revolution Island, upper part of Samojlovich Formation, Wenlock, Lower Silurian. Scale bar: 0.3 mm.
FIG. 9. — A-D, Paralogania klubovi n in Ordovician and Lower Silurian thelodonts from Severnaya Zemlya Archipelago (Russia)
FIG. 9. — A-D, Paralogania klubovi n. sp.; A, B, head scales in base view (see Fig. 8A, B); C, trunk scale of type A in base view (see Fig. 8D); D, trunk scale of type B in base view (see Fig. 8F); A, LIG 35-085; B, LIG 35-086; C, LIG 35-087; D, LIG 35-088; E, Loganelliidae gen. et sp. indet.; scale in base view (see Fig. 8J, K), LIG 35-089; sample 2zh, Pioneer Island, middle(?) Llandovery, Lower Silurian. Scale bar: 0.1 mm.
FIG. 3 in Ordovician and Lower Silurian thelodonts from Severnaya Zemlya Archipelago (Russia)
FIG. 3. — Set of scales of Stroinolepis maenniki n. gen., n. sp., the same scales are presented in Fig. 2; A-M, Stroinolepis maenniki n. gen., n. sp.; A, head scale; B-E, transitional scales; F-M, undivided trunk and fin scales; A-G, I, L, M, scales in crown view; H, lateral oblique view; J, K, lateral view; A, Pi 7476; B, Pi 7479; C, Pi 7477; D, Pi 7484; E, Pi 7480; F, Pi 7472; G, Pi 7478; H, I, Pi 7481; J, Pi 7474, scale is lost; K, Pi 7470; L, Pi 7469; M, Pi 7473; A, C, F, G, J-M, sample MF 49-7, Strojnaya River, Ozernaya Formation, Middle-Upper Ordovician; B, E, H, I, sample MF 49-9; D, sample MF 49-11, Strojnaya River, October Revolution Island, Strojnaya Formation, Upper Ordovician. Scale bar: 0.5 mm.
FIG. 2. — A-M, Stroinolepis maenniki n. gen., n in Ordovician and Lower Silurian thelodonts from Severnaya Zemlya Archipelago (Russia)
FIG. 2. — A-M, Stroinolepis maenniki n. gen., n. sp.; A, head scale; B-E, transitional scales; F-M, undivided trunk and fin scales; A-G, I, L, M, scales in crown view; H, lateral oblique view; J, K, lateral view; A, Pi 7476; B, Pi 7479; C, Pi 7477; D, Pi 7484; E, Pi 7480; F, Pi 7472; G, Pi 7478; H, I, Pi 7481; J, Pi 7474, scale is lost; K, Pi 7470; L, Pi 7469; M, Pi 7473; A, C, F, G, J-M, sample MF 49-7, Strojnaya River, Ozernaya Formation, Middle-Upper Ordovician; B, E, H, I, sample MF 49-9; D, sample MF 49-11, Strojnaya River, October Revolution Island, Strojnaya Formation, Upper Ordovician; N-S, Loganellia grossi Fredholm, 1990; N, head scale; O, transitional scale; P-S, trunk scales; N, O, Q-S, scales in crown view; P, a scale in base view; N, Pi 7530; O, Pi 6839; P, Pi 7533; Q, Pi 7532; R, Pi 6837; S, Pi 7535; sample 2-68, Matusevich River, October Revolution Island, upper part of Samojlovich Formation, Wenlock, Lower Silurian. Scale bars: 0.1 mm.
FIG. 6 in Ordovician and Lower Silurian thelodonts from Severnaya Zemlya Archipelago (Russia)
FIG. 6. — Microstructure of the scales; A, B, Loganellia matura n. sp.; C-F, Shielia multispinata n. sp.; G, Paralogania consimilis n. sp.; A, Pi 7624; B, Pi 7625; C, Pi 7626; D, Pi 7627; E, Pi 7628; F, Pi 7629; G, Pi 7630; A, B, sample MF 3-8, Srednii Island, Golomyannyj Formation, middle part of Llandovery, Lower Silurian; C-F, sample MF 157-7, Spokojnaya River, upper part of Samojlovich Formation, Wenlock, Lower Silurian; G, sample MF 46-23, Ushakov River, October Revolution Island, upper part of Samojlovich Formation, Wenlock, Lower Silurian. Abbreviations: asp, aspidine "pegs" in the base; b, base; bc, canal in the base; cr, crown; dc, dentine canal; dt, dentine tubules; fpc, fan-shaped pulp canals; lac, lacunae of dentine canals; mpc, main pulp canal; n, neck; pc, pulp canal; pco, pulp canal opening; sp, spine. Scale bars: 0.1 mm.
FIG. 10. — Paralogania klubovi n in Ordovician and Lower Silurian thelodonts from Severnaya Zemlya Archipelago (Russia)
FIG. 10. — Paralogania klubovi n. sp., microstructure of the scales; A, head scale, LIG 35-086; B, trunk scale, LIG 35-087; the scales were drawn in anise oil; sample 2zh, Pioneer Island, middle(?) Llandovery, Lower Silurian. Abbreviations: b, base; cr, crown; dt, dentine tubules; odt, openings of dentine tubules; mpc, main pulp canal. Scale bar: 0.1 mm.
FIG. 5. — A-O, Loganellia matura n in Ordovician and Lower Silurian thelodonts from Severnaya Zemlya Archipelago (Russia)
FIG. 5. — A-O, Loganellia matura n. sp.; A, B, head scales; C-E, transitional scales; F-M, O, trunk scales; N, fin? scale; A, C, F-H, J-L, N, scales in crown view; B, D, E, M, scales in lateral view; I, a scale in base view; N, posterior half of a trunk? scale in lateral view; A, Pi 7486; B, Pi 7487; C, Pi 7499; D, Pi 7496; E, Pi 7489; F, Pi 7494; G, holotype Pi 7492; H, Pi 7490; I, Pi 7497; J, Pi 7493; K, Pi 7501; L, M, Pi 7495; N, Pi 7485; O, Pi 7500; sample MF 3-8, Srednii Island, Sedov Archipelago, Golomyannyj Formation, middle Llandovery, Lower Silurian; P-S, Thelodus calvus n. sp.; P, LIG 35-907; Q, holotype Pi 7503; R, Pi 7505; S, Pi 7504; P, a scale in crown view; Q, S, in lateral view; R, in base view; P, sample 32a-208; Q-S, sample MF 46-23; Ushakov River, October Revolution Island, Samojlovich Formation, Wenlock, Lower Silurian. Scale bars: 0.1 mm.
FIG. 8. — A-I, Paralogania klubovi n in Ordovician and Lower Silurian thelodonts from Severnaya Zemlya Archipelago (Russia)
FIG. 8. — A-I, Paralogania klubovi n. sp.; A, B, head scales; C, transitional scale; D-I, trunk scales; A, B, D-F, H, I, scales in crown view; C, a scale in base view; G, a scale (holotype) in lateral view; A, LIG 35-085; B, LIG 35-086; C, LIG 35-832; D, LIG 35-087; E, LIG 35-833; F, LIG 35-088; G, LIG 35-834; H, LIG 35-835; I, LIG 35-836; J-L, Loganelliidae gen. et sp. indet.; J, scale in crown view; K, posterior part of the same scale; L, enlarged part of left posterior section, LIG 35-089; sample 2zh, Pioneer Island, middle(?) Llandovery, Lower Silurian. Scale bars: 0.1 mm
FIG. 1 in Ordovician and Lower Silurian thelodonts from Severnaya Zemlya Archipelago (Russia)
FIG. 1. — Distribution of thelodonts in the Ordovician to Devonian sections of October Revolution and coeval strata of Srednii (marked with triangles) and Pioneer (marked with stars) islands.
FIG. 13. — Paralogania consimilis n in Ordovician and Lower Silurian thelodonts from Severnaya Zemlya Archipelago (Russia)
FIG. 13. — Paralogania consimilis n. sp., microstructure of the scales; A, B, vertical longitudinal section; A, Pi 7621; B, Pi 7620; C, horizontal section, Pi 7622; sample 46-23, Ushakov River, October Revolution Island, upper part of Samojlovich Formation, Wenlock, Lower Silurian. Abbreviations: lac, lacunae; mpc, main pulp canal; pc, pulp canal; pd, pulp depression; sh, canals of Sharpey's fibres; sp, spine. Scale bar: 0.1 mm.
FIG. 7. — A-S, Shielia multispinata n in Ordovician and Lower Silurian thelodonts from Severnaya Zemlya Archipelago (Russia)
FIG. 7. — A-S, Shielia multispinata n. sp.; A, head scale; B-D, F, transitional scales; E, G-P, trunk scales; Q-S, fin scales; A, B, scales in lateral view; C-N, P, Q, S, scales in crown view; O, a scale in oblique view; R, a scale in base view; A, Pi 7517; B, Pi 7519; C, Pi 7518; D, Pi 7520; E, Pi 7521; F, Pi 6804; G, Pi 7523; H, Pi 7522; I, Pi 7524; J, Pi 7525; K, holotype Pi 6803; L, Pi 6805; M, Pi 6801; N, O, Pi 7526; P, Pi 6802; Q, Pi 7527; R, Pi 7529; S, Pi 7528; sample MF 157-7, Spokojnaya River, October Revolution Island, upper part of Samojlovich Formation, Wenlock, Lower Silurian; T-V, Thelodus? sp., scales in crown view; T, Pi 7516; U, LIG 35 908; V, Pi 6814; T, V, sample MF 46-23; U, sample 32a-208, Ushakov River, October Revolution Island, Samojlovich Formation, Wenlock, Lower Silurian. Scale bars: A-I, K-M, P-V, 0.1 mm; J, N, O, 0.2 mm.
FIG. 4. — Stroinolepis maenniki n. gen., n in Ordovician and Lower Silurian thelodonts from Severnaya Zemlya Archipelago (Russia)
FIG. 4. — Stroinolepis maenniki n. gen., n. sp., microstructure of the scales, Pi 7648, sample MF 49-7, Strojnaya River, October Revolution Island, Ozernaya Formation, Middle-Upper Ordovician. Abbreviations: dt, dentine tubules; lac, lacunae of dentine canals. Scale bar: 0.1 mm.
FIG. 12 in Ordovician and Lower Silurian thelodonts from Severnaya Zemlya Archipelago (Russia)
FIG. 12. — Set of scales of Paralogania consimilis n. sp.; A-E, head scales; F, G, transitional scales; H-P, S, T, W, trunk scales; Q, R, U, V, fin scales; A, LIG 35-149; B, LIG 35-150; C, LIG 35-151; D, LIG 35-152; E, LIG 35-153; F, LIG 35-154; G, LIG 35-155; H, LIG 35-156; I, LIG 35-163; J, K, LIG 35-168; L, LIG 35-169; M, LIG 35-170; N, LIG 35-171; O, LIG 35-172; P, LIG 35-173; Q, R, LIG 35- 174; S, LIG 35-175; T, LIG 35-176; U, LIG 35-177; V, LIG 35-178; W, LIG 35-179; sample 31-208, Ushakov River, October Revolution Island, upper part of Samojlovich Formation, Wenlock, Lower Silurian. Scale bar: 0.3 mm.
FIG. 4 in Statistical comparisons of late Caradoc (Ordovician) brachiopod faunas around the Iapetus Ocean, and terranes located around Australia, Kazakhstan and China
FIG. 4. — Proposed palaeogeographic reconstruction; Kazakh terranes: 1, Altai-Sayan; 2, Chu-Ili; 3, Chingiz; limits of terranes unknown. Scale bar: 4000 km.
FIG. 3 in Statistical comparisons of late Caradoc (Ordovician) brachiopod faunas around the Iapetus Ocean, and terranes located around Australia, Kazakhstan and China
FIG. 3. — Assemblage scores on axes 1 and 2 of detrended correspondence analysis (DCA) based on presence/absence of genera. Key: same as Figure 2.
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