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492 results for “Silurian”
Early Silurian chondrichthyans from the Tarim Basin (Xinjiang, China)
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Data from: Abundance and extinction in Ordovician-Silurian brachiopods, Cincinnati Arch, Ohio and Kentucky
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Data from: A novel respiratory architecture in the Silurian mollusc Acaenoplax
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Supplementary data for: A Silurian (Homerian) pelmatozoan echinoderm fauna from west-central Ohio
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Data from: Silurian (late Llandovery–Wenlock) conodont fauna and biostratigraphy from the Yanbian area of Sichuan province, south-west china
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Telychian Bryozoa, Matrix (Bryozoans from the lower Silurian (Telychian) Hanchiatien Formation from southern Chongqing, South China)
<p>Eight bryozoan species are described from the Hanchiatien Formation (lower Silurian, Telychian) of southern Chongqing, South China. Four species are new: the trepostomes <i>Asperopora sinensis </i>n. sp., <i>Trematopora jiebeiensis</i> n. sp., and <i>Trematopora tenuis </i>n. sp., and the fenestrate <i>Moorephylloporina parvula</i> n. sp. One species, a cystoporate <i>Hennigopora</i> sp. is described in open nomenclature. <i>Moorephylloporina parvula</i> n. sp. is eurytopic, occurring in all types of facies within the bioherms. Erect <i>Moorephylloporina</i>, <i>Trematopora</i> and <i>Leioclema</i> form pioneering communities on weakly cemented substrates, whereas encrusting <i>Fistulipora</i>, <i>Hennigopora</i> and <i>Asperopora</i> occur on hardgrounds and form densely compact framestones. Robust branched <i>Trematopora</i> and <i>Leioclema</i> tend to occur out of the reef core (framework) where they may have formed reef-flank thickets in more agitated conditions. The generic composition of the studied fauna correlates with other localities in South China, and they show general palaeobiogeographic relations to Siberia and Indiana, USA.</p>
Fig. 19. A,B, Stelechocladia praeattenuata n in Dendroid and Tuboid Graptolites from the Llandovery (Silurian) of the Four Mile Creek Area, New South Wales
Fig. 19. A,B, Stelechocladia praeattenuata n.sp.: A, AM F114743, holotype, and B, AM F114744, both BF18; C, Acanthograptus praedeckeri praedeckeri n.sp., AM F114629a, F14. Scale bars 1 mm.
Fig. 15. A,B, Callograptus bridgecreekensis n in Dendroid and Tuboid Graptolites from the Llandovery (Silurian) of the Four Mile Creek Area, New South Wales
Fig. 15. A,B, Callograptus bridgecreekensis n.sp.: A, AM F114569a, holotype, F14; B, paratype AM F114569b, F14. Scale bars 1 mm.
Fig. 1 in A New Siphonotretid Brachiopod from the Silurian of Central-Western New South Wales, Australia
Fig. 1. Regional geological map of the Boree Creek area. Stratigraphical section BM is indicated. Location of Fig. 2 is indicated by boxed area. (From Valentine et al., 2003)
Fig. 1 in Filling the Silurian gap of solutan echinoderms with the description of new species of Dehmicystis from Spain
Fig. 1. Localization of the study area in the northern part of the Central Iberian Zone, Spain. A. Sketch of the Iberian Massif showing the different structural and palaeogeographic zones with Neoproterozoic and Palaeozoic rocks. B. Schematic geological map, showing the position of the fossil locality star) yielding the studied specimen. Base map modified from Villar Alonso et al. (2008) and González Menéndez et al. (2008), with Silurian subdivision adapted from Apalategui Isasa et al. (1981) and Abril Hurtado et al. (1982).
Fig. 3 in Trepostome bryozoans encrusting Silurian gastropods: A taphonomic window and its implications for biodiversity
Fig. 3. Thin sections of trepostome bryozoan Homotrypa cochlea sp. nov. from Upper Leintwardine Formation; Ludfordian, upper Ludlow, Silurian; Delbury Quarry, Shropshire, UK. A. NMW 2019.21G.5.2, encrusting colonies comprising multiple layers caused by self-overgrowths (A1), apex of gastropod shell encrusted with bryozoan colony (A2), colony does not grow over the gastropod shell aperture (A3, A4). B. NMW 2019.21G.6.2, colony encrusting apertural side of shell thinner than on the abapertural side, arrow indicates Trypanites boring in bryozoan colony. C. NMW 2019.21G.7.3, colony can be seen inside the aperture of gastropod shell.
Fig. 3 in Silurian thelodonts from the Niur Formation, central Iran
Fig. 3. The phlebolepidiform thelodont Niurolepis susanae gen. et sp. nov. from sample S23, late Wenlock /?early Ludlow of the Niur Formation, east central Iran. Photomicrographs of thin sections. A. Vertical longitudinal section of a trunk scale AEU 4111. B. Vertical longitudinal section of a trunk scale AEU 4112. C. Horizontal section of a head scale AEU 4113. Scale bars 0.2 mm.
Text-fig. 2. Chitinozoan distribution in the Bykoš section, Wenlock (Silurian), Prague Basin, Czech Republic. in Lower Wenlock Chitinozoa From The Bykoš Locality (Silurian, Prague Basin, Barrandian Area, Czech Republic)
Text-fig. 2. Chitinozoan distribution in the Bykoš section, Wenlock (Silurian), Prague Basin, Czech Republic.
Text-fig. 1. Graptolite biostratigraphy of the Silurian showing the up to present documented occurrences of scolecodonts in the Prague Basin. The graptolite zones are shown proportionally to the supposed relative time length (chart after Kříž 1992; Štorch 2001). in Revision Of Kettnerites Žebera, 1935 (Scolecodonta, Silurian Of The Barrandian Area, Czech Republic): Preliminary Results
Text-fig. 1. Graptolite biostratigraphy of the Silurian showing the up to present documented occurrences of scolecodonts in the Prague Basin. The graptolite zones are shown proportionally to the supposed relative time length (chart after Kříž 1992; Štorch 2001).
FIG. 10 in Conodonts in the Silurian of Severnaya Zemlya and Sedov archipelagos (Russia), with special reference to the genus Ozarkodina Branson & Mehl, 1933
FIG. 10. — Ozarkodina waugoolaensis Bischoff, 1986; A, C, Cn 6064, lower and lateral views of Pa element; B, Cn 6035, lateral view of Pb element; D, Cn 6079, lateral view of Sc element; E, I, L, Cn 6067, lateral and lower views of Pa element (L in translucent light); F, Cn 6041, lateral view of M element; G, Cn 6078, lateral view of M element; H, Cn 6042, lateral view of Sc element; J, Cn 6043, posterior view of Sb element; K, M, N, Cn 6066, lateral and lower views of Pa element (N in translucent light); A, (C), from the lower part of the Golomyannyj Formation, October Revolution Island, Strojnaya River, section 52, sample MF 52-23; B, from the lowermost part of the Srednij Formation, Srednij Island, section 1(79), sample MF 2-13; D, G, from the upper part of the Srednij Formation, October Revolution Island, Ushakov River, section 32, sample MF 46-19; F, H, J, from the lowermost part of the Srednij Formation, Srednij Island, section 1(79), sample MF 2-10; K, (M, N); E, (I-L), from the upper part of the Vodopad Formation, October Revolution Island, Ushakov River, section 32, sample MF 46-14. Scale bar: 0.5 mm.
FIG. 6 in Conodonts in the Silurian of Severnaya Zemlya and Sedov archipelagos (Russia), with special reference to the genus Ozarkodina Branson & Mehl, 1933
FIG. 6. — Conodont-based correlation of the Silurian sequence on Severnaya Zemlya with the international Silurian standard epochs and stages.
FIG. 26 in Silurian and Devonian brachiopods from Severnaya Zemlya (Russian Arctic)
FIG. 26. — Undispirifer? obsoletiplicatus n. sp.; A-C, ventral view of different sizes pedicle valves; A, N 69/12991; B, holotype (N 68/12991); C, N 70/12991; D, E, dorsal view of a brachial valve (NN 71/12991, 72/12991); F, posterior view of a pedicle valve with interarea and open delthyrium (N 73/12991); G, H, external moulds of pedicle valves, showing a well developed muscle field and gonad impressions (NN 74/12991, 75/12991), loc. 215581, Severnaya Zemlya or Pod''emnaya formations. Scale bars: A-E, 6 mm; F-H, 5 mm.
FIG. 14. — Valiukia flabellata n. gen., n in Upper Silurian thelodonts from Severnaya Zemlya Archipelago (Russia)
FIG. 14. — Valiukia flabellata n. gen., n. sp., trunk scales; A, B, holotype (see also Fig. 12G); A, C, E, F, H, J, K, scales in crown view; B, magnified posterior part of A; D, magnified posterior part of C; G, magnified posterior part of F; I, magnified posterior part of H; L, scale in lateral view; M, scale in base view; A, B, LIG 35-844; C, D, LIG 35-845; E, LIG 35-846; F, G, LIG 35-847; H, I, LIG 35-853; J, LIG 35-851; K, LIG 35-852; L, LIG 35-854; M, LIG 35-855; sample 2-23, Matusevich River, October Revolution Island, Ust- Spokojnaya Formation, Ludlow, Upper Silurian. Scale bars: 0.1 mm.
FIG. 6 in Silurian and Devonian brachiopods from Severnaya Zemlya (Russian Arctic)
FIG. 6. — Coolinia gracilis (Andreeva in Nikiforova & Andreeva, 1961); A, ventral view of a pedicle valve (N 13/12991); B, C, dorsal view of a damaged brachial valve (N 14/12991), loc. 29a,?Vodopad Formation. Scale bars: A, B, 6 mm; C, 10 mm.
Figure 3 in The histology and affinities of sinacanthid fishes: primitive gnathostomes from the Silurian of China
Figure 3. Hypothesis of phylogenetic relationships of lower vertebrates based upon the cladograms of Donoghue et al. (2000) for the lower vertebrates and Coates & Sequeira (2001b) for the chondrichthyans. Taxa underlined (e.g. Eriptychius) are known to have possessed globular calcified cartilage, whilst those in bold and asterisked (e.g. chondrichthyans*) possessed spines composed from single units. The distribution of these two characters, coupled with the growth model suggested in the main text for sinacanthid spines, suggest that they occupy a position close to the chondrichthyan node; either as a highly derived component of the gnathostome stem-group (crownward of the placoderms) (dashed line 1), or plesiomorphic or basal crown-group chondrichthyans (dashed line 2).
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Allen Brain Atlas
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