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870 results for “Ordovician”
FIGURE 5 in Putative Ordovician green alga Krejciella reinterpreted as enteropneust hemichordate tube (Czech Republic)
FIGURE 5. Distribution of tubiculous fossils classified as Margaretia in the middle Cambrian and specimens of Krejciella in the Middle Ordovician. A. Stratigraphic ranges of tubiculous fossils in Cambrian and Ordovician. B. Palaeogeographical reconstruction of the middle Cambrian. C. Palaeogeographical reconstruction of the Middle Ordovician. Palaeogeography modified after Cocks and Torsvik (2002, 2011), Fatka and Mergl (2009) and Torsvik and Cocks (2013). B - Burgess Lagerstäte. D - Dobrotivá Lagerstäte. G - Guanshan Lagerstäte. K - Kinzers Lagerstäte. L - Latham Lagerstäte. M - Marjum Lagerstäte. RS - Rockslide Formation Lagerstäte. S - Sinsk Lagerstäte. R - Rennie Lagerstäte. W - Wheeler Lagerstäte.
FIGURE 4 in Putative Ordovician green alga Krejciella reinterpreted as enteropneust hemichordate tube (Czech Republic)
FIGURE 4. Sketch showing the distribution of major biofacies associated with the late Darriwilian-early Sandbian Dobrotivá Formation. The shallowest part of the basin was inhabited by a sparse orthid brachiopod association. In the offshore direction it was replaced by the Placoparia Association, which is characterized by a rich skeletal fauna with trilobites and brachiopods. In the offshore slope settings, it grades into a low-diversity atheloptic trilobite association that also includes 'gardens' of benthic dendroids. The water column was inhabited by planktonic graptolites and taxa of the poorly diverse Cyclopygid Biofacies, particularly by Degamella princeps. Poorly oxygenated black shales in the central part of the basin were dominated by the Paterula Association, at some sites associated with the trilobite Zeliszkella oriens. Modified after Fatka and Mergl (2009, figure 11d) and Peršín and Budil (2009).
FIGURE 7 in Putative Ordovician green alga Krejciella reinterpreted as enteropneust hemichordate tube (Czech Republic)
FIGURE 7. Size variation of Linochitina pissotensis. Green dots = the herein studied sample. Blue squares = Cekov HJ 1 drill core, Dobrotivá Formation (Fatka et al., 1997). Red crosses = Kazín section, Letná Formation (Vodička and Fatka, 2017). Grey triangles = type material (Paris, 1981). Black triangle = holotype (Paris, 1981).
FIGURE 3 in Putative Ordovician green alga Krejciella reinterpreted as enteropneust hemichordate tube (Czech Republic)
FIGURE 3. Other material of Krejciella putzkeri Obrhel 1968. Flattened fragments of tube-shaped fossils. White arrows indicate fibres. A. External mould, ČGS JP2015a. B. ČGS JP 2016b detail of pores. C. Internal mould, ČGS JP2015b. D. Internal mould, ČGS JP2016a. E. Internal mould, ČGS JP2017.
FIGURE 7 in Teganium (Porifera, Hexactinellida) from the Middle Ordovician Castle Bank fauna of Avalonia (Wales, UK)
FIGURE 7. Palaeogeographic distributions of species of Teganium (all species in B originally assigned to Teganiella). A, Ordovician (Sandbian, 458 Ma). B, Carboniferous (Visean, 340 Ma). Map constructed using GPlates (Müller et al. 2018) using data from Torsvik & Cocks (2016). Does not include unconfirmed taxa listed by Ruedemann (1925b, 1934, 1942).
FIGURE 6 in Teganium (Porifera, Hexactinellida) from the Middle Ordovician Castle Bank fauna of Avalonia (Wales, UK)
FIGURE 6. Teganium sp., from the Middle Ordovician Castle Bank Biota, Wales. A, NMW.2021.3G.76i and ii, overall view, with positions of detail images indicated by boxes (all rotated). B, apex of NMW.2021.3G.76i, apex of sponge showing extensive marginalia; C, detail of body wall showing characteristic texture (boxed area enlarged inset); D, apex of NMW.2021.3G.76ii, with oscular margin and trace of marginalia. Scale bars: A equals 10 mm; B–D equal 1 mm.
FIGURE 5 in Teganium (Porifera, Hexactinellida) from the Middle Ordovician Castle Bank fauna of Avalonia (Wales, UK)
FIGURE 5. Cut-away reconstruction of Teganium avalonensis sp. nov., with detail of wall structure on the right; dermal/hypodermal skeleton in lower part, and choanosomal layer with exhalent canals in upper part.
FIGURE 3 in Teganium (Porifera, Hexactinellida) from the Middle Ordovician Castle Bank fauna of Avalonia (Wales, UK)
FIGURE 3. Teganium avalonensis sp. nov. A, paratype NMW.2021.3G.74; apical part with marginalia, imaged with directed light (from right) to highlight texture of body wall; B, paratype NMW.2021.3G.98, with low-angle light to highlight diagnostic texture of body wall (boxed area enlarged inset); C–F, paratype NMW.2021.3G.82, partial specimen with the boxes in C indicating positions of D, E and F; D, lateral detail to show reticulate skeletal grid (plane-polarised light); E, detail showing scale of minute triaxon spicules within the same area; centres of several spicules arrowed; F, detail of central part of specimen in cross-polarised light (contrast enhanced) to highlight the small circular cavities within choanosomal (internal) layer of body wall. Scale bars: A, B, D, F equal 1 mm; C equals 5 mm; E equals 0.1 mm.
FIGURE 2 in Teganium (Porifera, Hexactinellida) from the Middle Ordovician Castle Bank fauna of Avalonia (Wales, UK)
FIGURE 2. Teganium avalonensis sp. nov., from the Middle Ordovician Castle Bank Biota, Wales. A–B: paratype slab NMW.2021.3G.72, with pair of sponges in A, plane-polarised light, and B, cross-polarised; C, E, holotype NMW.2021.3G.71: C, overall view, with box indicating area enlarged in E; E, detail of basal region showing projecting basalia; D, paratype NMW.2021.3G.73, overall view. Scale bars: A–D equal 5 mm; E equals 1 mm.
FIGURE 4 in Teganium (Porifera, Hexactinellida) from the Middle Ordovician Castle Bank fauna of Avalonia (Wales, UK)
FIGURE 4. Paratypes of Teganium avalonensis sp. nov. A, NMW.2021.3G.77; B, NMW.2021.3G.98 in cross-polarised light (boxed area enlarged in Figure 3B); C, NMW.2021.3G.78 with pair of specimens, the right-hand one with marginalia; D, NMW.2021.3G.79; E, NMW.2021.3G.81 with multiple specimens, in cross-polarised light; F, NMW.2021.3G.80. Scale bars equal 1 mm.
FIGURE 1 in Teganium (Porifera, Hexactinellida) from the Middle Ordovician Castle Bank fauna of Avalonia (Wales, UK)
FIGURE 1. Locality map (left) and local stratigraphy of the Castle Bank locality, showing occurrence of Teganium avalonensis sp. nov. within the Castle Bank sequence (mainly siltstone, with shading representing colour of sediment; v: volcanic ash layers). Exact locality information is deposited with the specimens.
Figure 3 in Sheltered preservation in Ordovician trilobites
Figure 3. Sheltered trilobites from the ŠAErka Formation. (A) Internal mould of slightly damaged articulated exoskeleton of Placoparia sp. preserved inside of a cephalopod fragment, MBHR 21086. (B) Internal mould of a complete articulated specimen of Placoparia sp. preserved inside a fragment of an indetermined pseudorthocerid cephalopod, WBM S 05156. (C) External mould of thorax of a small trilobite?Placoparia sp. preserved inside the phragmocone chamber of the rare actinocerid cephalopod "Orthoceras" cf. bonum Barrande, 1867, GBA 2011/054/0001. (D) Seven thoracic segments of Placoparia sp. preserved within an incomplete and indeterminable orthocone cephalopod, WBM S 157. (E) Internal mould of cephalon and axial part of two anterior-most thoracic segments of the harpetid trilobite Eoharpes sp. is preserved inside of an incomplete phragmocone chamber of a middle-sized undetermined cephalopod, MBHR 337. (F) Internal mould of articulated incomplete exoskeleton of Eoharpes primus preserved under a large shield of an illaenid or asaphid trilobite, MBHR 8948. (G) Internal moulds of three articulated holaspid exoskeletons of Placoparia associated with 25 mm long thoracopygon of a holaspid specimen of Ormathops atavus (Barrande, 1872), VV285. (H) Four articulated exoskeletons of Placoparia sp. inside of a body chamber of a small, undetermined cephalopod, VV296a, b. Ar – Arachnostega gastrochaenae, c – isolated cephalon of Placoparia, e – enrolled specimen of Placoparia, h – in situ preserved hypostome, p – pygidium, s – septum. Localities: (A) and (G) Osek, (B) Cheznovice – ŠtěpAEnský rybník, (D) Mýto – highway, (F) and (H) Díly near Rokycany, (C) and (E) unknown. All specimens coated with ammonium chloride.
Figure 2 in Sheltered preservation in Ordovician trilobites
Figure 2. Stratigraphy of the Ordovician of the Prague Basin showing distribution of Eoharpes and Placoparia (modified from Fatka and Budil, 2014 and Budil and Fatka, 2021). Placoparia (P.) – Placoparia (Placoparia), Placoparia (C.) – Placoparia (Coplacoparia), Placoparia (H.) – Placoparia (Hawleia).
Figure 1 in Sheltered preservation in Ordovician trilobites
Figure 1. Geographical distribution of localities yielding Eoharpes and Placoparia preserved inside of cephalopod conchs and under large exoskeletal parts.
Text-fig. 1. Bohemian Massif with position of the Prague Basin (in black) and distribution of Ordovician rocks in the Prague Basin, with geographic position of main localities of the siliceous nodules. in Porambonites Havliceki Sp. Nov., A New Brachiopod From The Šárka Formation (Darriwilian) From Bohemia And Its Contribution To Early History Of The Porambonitidae
Text-fig. 1. Bohemian Massif with position of the Prague Basin (in black) and distribution of Ordovician rocks in the Prague Basin, with geographic position of main localities of the siliceous nodules.
Text-fig. 9. Revultex impression of a siliceous concretion NM L 31967. A – an assemblage of three specimens of Barrandicella cf. tarda (PERNER, 1903); a – indeterminate early shell (? Barrandicella sp.), b – Mytoconula sp., ×...... B – Mytoconula sp., obligue left lateral view of an early shell just after landing on the Barrandicella surface, with a narrow flat rim of initial teleoconch shell, probably pressed down by sediment, ×......; C – the same, obligue left lateral view, ×......; D – the same, oblique right posterolateral view showing increments in the early shell, ×....... Dobrotivá F., PrahaŠárka. in Patelliconus Horný, 1961 And Mytoconula Gen. N. (Mollusca, Tergomya) From The Ordovician Of Perunica
Text-fig. 9. Revultex impression of a siliceous concretion NM L 31967. A – an assemblage of three specimens of Barrandicella cf. tarda (PERNER, 1903); a – indeterminate early shell (? Barrandicella sp.), b – Mytoconula sp., ×...... B – Mytoconula sp., obligue left lateral view of an early shell just after landing on the Barrandicella surface, with a narrow flat rim of initial teleoconch shell, probably pressed down by sediment, ×......; C – the same, obligue left lateral view, ×......; D – the same, oblique right posterolateral view showing increments in the early shell, ×....... Dobrotivá F., PrahaŠárka.
Text-fig. 8. Mytoconula vonkai sp. n. Specimen NM L 38914, internal mould with patches of shell. A – apical view, ×......; B – oblique posterior view showing radial ribs on internal mould, ×......; C – anteri- or part with a large patch of shell with irregular incremental structures, ×......; D – left lateral view, ×......;. Dobrotivá F., Malé Přílepy. in Patelliconus Horný, 1961 And Mytoconula Gen. N. (Mollusca, Tergomya) From The Ordovician Of Perunica
Text-fig. 8. Mytoconula vonkai sp. n. Specimen NM L 38914, internal mould with patches of shell. A – apical view, ×......; B – oblique posterior view showing radial ribs on internal mould, ×......; C – anteri- or part with a large patch of shell with irregular incremental structures, ×......; D – left lateral view, ×......;. Dobrotivá F., Malé Přílepy.
Text-fig. 3. Patelliconus primulus (BARRANDE in PERNER, 1903). Specimen NM L 39616, internal mould. A – apical view, B – oblique left posterolateral view, both ×......; C – right posterolateral view showing the second and third successive positions of muscle band (arrowed), located on top of each elevation (= in the deepest place of the wide depression of shell interior at the periphery of a flat ramp), ×....... Šárka F., Volduchy – Díly near Rokycany. in Patelliconus Horný, 1961 And Mytoconula Gen. N. (Mollusca, Tergomya) From The Ordovician Of Perunica
Text-fig. 3. Patelliconus primulus (BARRANDE in PERNER, 1903). Specimen NM L 39616, internal mould. A – apical view, B – oblique left posterolateral view, both ×......; C – right posterolateral view showing the second and third successive positions of muscle band (arrowed), located on top of each elevation (= in the deepest place of the wide depression of shell interior at the periphery of a flat ramp), ×....... Šárka F., Volduchy – Díly near Rokycany.
Text-fig. 1. Patelliconus primulus (BARRANDE in PERNER, 1903). The holotype, NM L 8425. A – apical view, B – left lateral view, ×......; C – fragment of shell with weak unequal and irregular collabral growth structures near the posterior margin, ×...... Šárka F., Osek near Rokycany. in Patelliconus Horný, 1961 And Mytoconula Gen. N. (Mollusca, Tergomya) From The Ordovician Of Perunica
Text-fig. 1. Patelliconus primulus (BARRANDE in PERNER, 1903). The holotype, NM L 8425. A – apical view, B – left lateral view, ×......; C – fragment of shell with weak unequal and irregular collabral growth structures near the posterior margin, ×...... Šárka F., Osek near Rokycany.
Text-fig. 5. Mytoconula vonkai sp. n. The holotype NM L 31983, internal mould. A – apical, B – right apical and right antero-lateral views, both with visible series of muscle scars in two raised zones, ×......;. Note the two long divergent scar zones in A. Dobrotivá F., Mýto near Holoubkov. in Patelliconus Horný, 1961 And Mytoconula Gen. N. (Mollusca, Tergomya) From The Ordovician Of Perunica
Text-fig. 5. Mytoconula vonkai sp. n. The holotype NM L 31983, internal mould. A – apical, B – right apical and right antero-lateral views, both with visible series of muscle scars in two raised zones, ×......;. Note the two long divergent scar zones in A. Dobrotivá F., Mýto near Holoubkov.
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