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287 results for “Middle Ordovician”
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.
Fig. 11 in A Darriwilian (Middle Ordovician) bivalve-dominated molluscan fauna from the Stairway Sandstone, Amadeus Basin, central Australia
Fig. 11. Nucularcid and pteriomorphian bivalves from the Stairway Sandstone, Middle Ordovician, Australia. Internal moulds (B–K) and latex casts of external moulds (A, L, M). A. Sthenodonta sp. B (CPC 41468) from Petermann Creek, left-lateral view showing well marked growth lines. B. Johnmartinia cordata Pojeta and Gilbert-Tomlinson, 1977 (CPC 41469) from Areyonga Gorge; left-lateral view with dorsal border (B1), anterior view showing the pointy beak (B2). C–F. Nuculites wattii Tate, 1896 from Areyonga Gorge. C–E. Specimens in left (C, E) and right-lateral (D) dorsal views, showing well-defined anterior myophoric buttress, D additionally shows dorsal teeth (C, CPC 41470; D, CPC 41472; E, CPC 41472). F. Right-lateral view of fragmentary specimen with chevron shaped posterior teeth pointing anteriorly (CPC 41473). G. Cyrtodonta carberryi Pojeta and Gilbert-Tomlinson, 1977 (CPC 41474) from Areyonga Gorge; in right-lateral view with growth lines and at least one dorsal lateral tooth (G1), dorsal view illustrating the height of shell profile (G2). H–K. Cyrtodonta staffordae Pojeta and Gilbert-Tomlinson, 1977 from Petermann Creek (H–I, K) and Areyonga Gorge (J). H. Specimen in right-lateral view showing distinct growth lines (CPC 41475). I. Specimen in left-lateral view with three posterior lateral teeth (CPC 41476). J. Fragmentary posterior margin with duplivincular ligament and indications of three posterior lateral teeth (CPC 41478). K. Specimen in right-lateral view with a posterior lateral tooth (CPC 41477). L, M. Cyrtodonta sp. B. L. Anterior (L1) and left-lateral (L2) views of sub-ovate shell-profile (CPC 41479) from Petermann Creek. M. Sub-ovate shell-profile with growth lines (CPC 41480) from Areyonga Gorge. Scale bars 10 mm.
Fig. 10 in A Darriwilian (Middle Ordovician) bivalve-dominated molluscan fauna from the Stairway Sandstone, Amadeus Basin, central Australia
Fig. 10. Nucularcid bivalves from the Stairway Sandstone, Middle Ordovician, Australia. Internal (A–H, I1, J1, K–N) and external (I2, J2) moulds. A–J. Sthenodonta eastii Pojeta and Gilbert-Tomlinson, 1977 from the Petermann Creek. A–D. Specimens in left-lateral views with chevron-shaped palaeotaxodont teeth (A, CPC 41455; B, CPC 41456; C, CPC 41456; D, CPC 41457). E. Specimen in dorsal view with teeth (CPC 41458). F, G. Specimens in right-lateral view with teeth and ventral border (F, CPC 41459; G, CPC 41460). H. Specimen in left-lateral view with anterior myophoric buttress preserved (CPC 41461). I. Specimen in right-lateral view showing indistinct growth lines (CPC 41462). J. Specimen in left-lateral view (CPC 41463). K, L. Sthenodonta paenesymmetrica sp. nov. from the Areyonga Gorge (K) and Petermann Creek (L), right-valves in dorsomedial views. K. Holotype (CPC 41464). L. Juvenile specimen (CPC 41465). M, N. Sthenodonta sp. A. M. Specimen (CPC 41467) from the Petermann Creek in right-lateral view with anterior muscle scars indicated and part of original shell material preserved. N. Specimen (CPC 41466) from Areyonga Gorge in right-lateral view with curved anterodorsal margin. Scale bars 10 mm.
Fig. 8 in A Darriwilian (Middle Ordovician) bivalve-dominated molluscan fauna from the Stairway Sandstone, Amadeus Basin, central Australia
Fig. 8. Number of individual bivalves (A) and bivalve species (B) distributed within orders/infraclasses in the Areyonga Gorge and Petermann Creek sections.
Fig. 4 in A Darriwilian (Middle Ordovician) bivalve-dominated molluscan fauna from the Stairway Sandstone, Amadeus Basin, central Australia
Fig. 4. Composite log of the Stairway Sandstone and abundance-charts showing distribution of bivalves and rostroconchs in the Areyonga Gorge section.
Fig. 5 in A Darriwilian (Middle Ordovician) bivalve-dominated molluscan fauna from the Stairway Sandstone, Amadeus Basin, central Australia
Fig. 5. Composite log of the Stairway Sandstone and abundance-charts showing distribution of bivalves and rostroconchs in the Petermann Creek section.
Fig. 2 in A Darriwilian (Middle Ordovician) bivalve-dominated molluscan fauna from the Stairway Sandstone, Amadeus Basin, central Australia
Fig. 2. Distribution of the Larapintine Sea in the Middle Ordovician. The extent of the Canning, Amadeus, and Georgina basins, all containing Middle Ordovician deposits, have been inferred together with the extent of continental landmass (marked with horizontal lines). Base map modified from Webby 1978. A. Webby's interpretation (1978). B. New interpretation based on faunal correlation. Note the broken connection between the Amadeus–Georgina basins and the Canning Basin.
Fig. 12 in A Darriwilian (Middle Ordovician) bivalve-dominated molluscan fauna from the Stairway Sandstone, Amadeus Basin, central Australia
Fig. 12. Pteriomorphian and heteroconchian bivalves, rostroconchs and gastropods from the Stairway Sandstone, Middle Ordovician, Australia. Internal moulds (A, B, E–M, N1) and latex casts of internal (N2, O) and external (C, D) moulds. A, B. Modiolopsis pojetai sp. nov. from Petermann Creek. A. Holotype (CPC 41481) in left-lateral view showing discrete longitudinal dorsal slit-like mark. B. Paratype (CPC 41482) in right-lateral view with umbo steeply descending anteriorly. C, D. Colpantyx? sp. A from Areyonga Gorge; in right (C, CPC 41483) and left-lateral (D, CPC 41484) views with two umbonal radial ribs anteriorly and one posteriorly. E, F. Sphenosolen draperi Pojeta and Gilbert-Tomlinson, 1977 from Petermann Creek (E, CPC 41485; F, CPC 41486), specimens with flat shell and narrow elongated sub-rectangular shape. G–M. Rostroconchia. G–I. Ribeiria csiro Pojeta, GilbertTomlinson, and Shergold, 1977 from Areyonga Gorge (G) and Petermann Creek (H–I); note the prominent triangular beak and curved ventral margin (G, CPC 41487; H, CPC 41488; I, CPC 41489). J. Ribeiria jonesi? from Petermann Creek, sub-rectangular profile and strong dorsally projecting umbo (CPC 41490). K, L. Pinnocaris sp. A from Petermann Creek with inflated pear-shaped profile (K, CPC 41491; L, CPC 41492). M. Technophorus walteri Pojeta, Gilbert-Tomlinson, and Shergold, 1977 from Areyonga Gorge (CPC 41493) with a single lateral radial rib and prominent nearly erect pegma indicated. N, O. Gastropoda, Scalites? sp. from Petermann Creek. N. CPC 41494 (N1), latex cast with clear growth lines (N2). O. CPC 41495, specimen with 3.5 to 4 whorls. Scale bars 10 mm, except C, D, M, 5 mm.
Fig. 7 in A Darriwilian (Middle Ordovician) bivalve-dominated molluscan fauna from the Stairway Sandstone, Amadeus Basin, central Australia
Fig. 7. Distribution of the cosmopolitan genera Modiolopsis, Cyrtodonta, and Nuculites found in the Stairway Sandstone and coeval strata elsewhere during the Middle Ordovician. Map modified from Torsvik et al. (2014).
Fig. 6 in The diploporite blastozoan Lepidocalix pulcher from the Middle Ordovician of northern Algeria: Taxonomic revision and palaeoecological implications
Fig. 6. Oral surface of the diploporite blastozoan Lepidocalix pulcher Termier and Termier, 1950a (MUA. 1024020); Middle Ordovician, Stita, Algeria. A. Four peri-orals (PO1, PO3, PO4, and PO6) between four circum-orals (CO1, CO2, CO4, and CO5), peristome partially covered by small subtriangular oral cover plates biseries, diplopore-bearing polygonal thecal plates immediately surrounding the peristome, hydropore over PO1 and PO6; in external view. B. Surface showing numerous diplopores. Photographs (A1, B1), coloured interpretations (A2, B2) of both surfaces illustrating names using circumorals and periorals (Paul 1973, 2017); in internal view. B–E ambulacral designations in Carpenter's system. Scale bars 5 mm.
Fig. 4 in The diploporite blastozoan Lepidocalix pulcher from the Middle Ordovician of northern Algeria: Taxonomic revision and palaeoecological implications
Fig. 4. Diploporite blastozoan Lepidocalix pulcher Termier and Termier, 1950a (MUA. 1023001); Middle Ordovician, Stita, Algeria. A. Photograph of latex cast of external mould showing spines, tubercles, and the appearance of imbricate plates. B. Camera lucida drawing, note three generations of plates. Scale bars 2 mm.
Fig. 3 in The diploporite blastozoan Lepidocalix pulcher from the Middle Ordovician of northern Algeria: Taxonomic revision and palaeoecological implications
Fig. 3. Original reconstruction of the diploporite blastozoan Lepidocalix pulcher Termier and Termier, 1950a (see Termier and Termier 1959; Kesling 1968). Scale bar 10 mm.
Fig. 6 in Morphology and ontogeny of some Middle Ordovician gonambonitid brachiopods from Baltoscandia
Fig. 6. Gonambonitid brachiopod Antigonambonites planus (Pander, 1830) from the Volkhovian regional stage, Darriwilian, Middle Ordovician of the Leningrad Region, Russia; ontogenetic series of dorsal valves. A. PIN 4921/792, exterior of 2 mm wide valve (A1), ribs crossing the halo rings (A2). B. PIN 4921/905, interior of 2.7 mm wide valve. C. PIN 4921/793, umbone of 3.2 mm wide valve showing ribs crossing the halo rings. D. PIN 4921/902, exterior of 3.5 mm wide valve (D1), dorsal umbone (D2), valve interior (D3). E. PIN 4921/899, 4 mm wide valve in exterior view. F. PIN 4921/903, interior of broken 5.5 mm wide valve (F1), dorsal adductor scars (F2).
Fig. 5 in Morphology and ontogeny of some Middle Ordovician gonambonitid brachiopods from Baltoscandia
Fig. 5. Gonambonitid brachiopod Antigonambonites planus (Pander, 1830) from the Volkhovian regional stage, Darriwilian, Middle Ordovician of the Leningrad Region, Russia; ontogenetic series of ventral valves. A. PIN 4921/785, spondylium of 3 mm wide valve in exterior (A1), interior (A2), and inner (A3) views. B. PIN 4921/884, posterior view of 3 mm wide valve with sealed pedicle tube. C. PIN 4921/879, posterior view of 3.4 mm wide valve with open pedicle tube. D. PIN 4921/880, exterior view of 3.5 mm wide valve with sealed pedicle tube and ribs reaching the posterior margin. E. PIN 4921/882, 3.8 mm wide valve in posterior view (E1), upper margin of pedicle tube infilling the delthyrium apex (E2), general exterior view (E3). F. PIN 4921/885, posterior view of 4 mm wide valve with elongated remnant of pedicle opening. G. PIN 4921/885, posterior view of 4 mm wide valve with circular remnant of pedicle opening (G1), enlarged upper margin of apical disc (arrow) near ventral umbone (arrowhead) (G2). H. PIN 4921/805, interior of 8 mm wide valve (H1), spondylium supported by three septa (H2), for cell molds see Fig. 8A, exterior of ventral umbone with sealed apical disc and ribs reaching the umbone posterior margin (H3). I. PIN 4921/883, 4.4 mm wide complete shell in posterior view.
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