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17 results for “Achnanthales”
FIGURES 9 in Marine Achnanthales (Bacillariophyceae) from New Caledonia (Melanesia): assemblage specificities, ultramafic environment
FIGURES 9–. Cocconeis pseudodiruptoides Foged. SEM (New Caledonia, Melanesia). SV hemi-fascia (external view 9, arrow) and slightly sigmoid sternum (9 and 11), complex loculate SV areolae (external views 10 and 11, arrow; internal view 12, arrowhead), RV with a strongly curved raphe ending (external view 14, arrowhead), RV areolae marginal short slits (external view 13, arrowhead), RV apex (external view 15). Scale bars = 3 µm (9, 11, 14), 2 µm (12), 1 µm (15), 500 nm (10), 300 nm (13).
FIGURES –. Rare taxa (SEM, New Caledonia, Melanesia). Cocconeis sp. 2 in Riaux-Gobin et al. 2015 (31, 32), short marginal SV striae between each short raised virgae (31, arrow; 32, arrowhead), SV narrow sternum, siliceous pearls (31), C. sp. 4 in Riaux-Gobin et al. 2015 (33–34), strong marginal crista marginalis, short marginal striae on top of each short raised virga (33, arrow; 34, arrowhead),?C. sp. 5 in Riaux-Gobin et al. 2015 (35–36), short SV striae and a raised axial structure (35, arrow). Scale bars = 3 µm (31), 2 µm (33, 35), 1 µm (32, 36), 500 nm (34). in Marine Achnanthales (Bacillariophyceae) from New Caledonia (Melanesia): assemblage specificities, ultramafic environment
FIGURES –. Rare taxa (SEM, New Caledonia, Melanesia). Cocconeis sp. 2 in Riaux-Gobin et al. 2015 (31, 32), short marginal SV striae between each short raised virgae (31, arrow; 32, arrowhead), SV narrow sternum, siliceous pearls (31), C. sp. 4 in Riaux-Gobin et al. 2015 (33–34), strong marginal crista marginalis, short marginal striae on top of each short raised virga (33, arrow; 34, arrowhead),?C. sp. 5 in Riaux-Gobin et al. 2015 (35–36), short SV striae and a raised axial structure (35, arrow). Scale bars = 3 µm (31), 2 µm (33, 35), 1 µm (32, 36), 500 nm (34).
FIGURES –8. Cocconeis coronatoides Riaux-Gobin & Romero forma 1. SEM (New Caledonia, Melanesia). SVVC partially attached (2, arrowhead), SV areolae domed hymenes with radial slits arranged by sectors (external view 3, arrowhead), marginal RV hyaline area (external view 4, arrowhead), uniseriate striae up to margin (4), open RVVC (5, ellipse), RVVC with irregularly spread fimbriae (6, arrowhead), SVVC still attached, small marginal chambers (internal view 7, arrowhead), SV margin (external view 8). Scale bars = 3 µm (8), 2 µm (2, 4, 7), 1 µm (6), 700 nm (5), 200 nm (3). in Marine Achnanthales (Bacillariophyceae) from New Caledonia (Melanesia): assemblage specificities, ultramafic environment
FIGURES –8. Cocconeis coronatoides Riaux-Gobin & Romero forma 1. SEM (New Caledonia, Melanesia). SVVC partially attached (2, arrowhead), SV areolae domed hymenes with radial slits arranged by sectors (external view 3, arrowhead), marginal RV hyaline area (external view 4, arrowhead), uniseriate striae up to margin (4), open RVVC (5, ellipse), RVVC with irregularly spread fimbriae (6, arrowhead), SVVC still attached, small marginal chambers (internal view 7, arrowhead), SV margin (external view 8). Scale bars = 3 µm (8), 2 µm (2, 4, 7), 1 µm (6), 700 nm (5), 200 nm (3).
FIGURES – 0. Cocconeis cf. delapunctata Hohn. SEM (New Caledonia, Melanesia). SV with axial void areas (external views 27–29, arrowheads), possible RV with areas devoid of areolae (30, arrowheads). Scale bars = 2 µm (27–30). in Marine Achnanthales (Bacillariophyceae) from New Caledonia (Melanesia): assemblage specificities, ultramafic environment
FIGURES – 0. Cocconeis cf. delapunctata Hohn. SEM (New Caledonia, Melanesia). SV with axial void areas (external views 27–29, arrowheads), possible RV with areas devoid of areolae (30, arrowheads). Scale bars = 2 µm (27–30).
FIGURE. Sampling sites in Province Sud (New Caledonia) and major mining Ni sites (* i.e.: Thio, Goro, La Tontouta), and major industrial Ni site (circle: Doniambo). in Marine Achnanthales (Bacillariophyceae) from New Caledonia (Melanesia): assemblage specificities, ultramafic environment
FIGURE. Sampling sites in Province Sud (New Caledonia) and major mining Ni sites (* i.e.: Thio, Goro, La Tontouta), and major industrial Ni site (circle: Doniambo).
FIGURES – 0. Cocconeis sp. (cf. capensis (Cholnoky) Witkowski). SEM (New Caledonia, Melanesia). External views. Biseriate SV striae (16, 18, twin arrows), narrow and straight SV sternum, marginal large area with one row of beads (16–18), SV marginal area with tiny pores (17), SV crater-like areolae with oblong in a zigzag lumen (19), SV areolae with sort of expansions (20). Scale bars: 4 µm (16), 3 µm (18), 700 nm (17), 400 nm (19–20). in Marine Achnanthales (Bacillariophyceae) from New Caledonia (Melanesia): assemblage specificities, ultramafic environment
FIGURES – 0. Cocconeis sp. (cf. capensis (Cholnoky) Witkowski). SEM (New Caledonia, Melanesia). External views. Biseriate SV striae (16, 18, twin arrows), narrow and straight SV sternum, marginal large area with one row of beads (16–18), SV marginal area with tiny pores (17), SV crater-like areolae with oblong in a zigzag lumen (19), SV areolae with sort of expansions (20). Scale bars: 4 µm (16), 3 µm (18), 700 nm (17), 400 nm (19–20).
FIGURES –. Cocconeis sp. (cf. C. bilicis F.Meister). SEM (New Caledonia, Melanesia). Different specimens with SV sectors separated (or not) by a crista marginalis (21, 24), SV striae uniseriae near the sternum and biseriate thereafter (21, 24), SV areolae lumen with circular ornamentation (23, arrow), crista marginalis (22), SVVC in advalvar view with digit fimbriae (25, arrowhead), large RV axial concave area (26). Scale bars = 6 µm (24), 5 µm (26), 4 µm (21), 3 µm (25), 1 µm (22–23). in Marine Achnanthales (Bacillariophyceae) from New Caledonia (Melanesia): assemblage specificities, ultramafic environment
FIGURES –. Cocconeis sp. (cf. C. bilicis F.Meister). SEM (New Caledonia, Melanesia). Different specimens with SV sectors separated (or not) by a crista marginalis (21, 24), SV striae uniseriae near the sternum and biseriate thereafter (21, 24), SV areolae lumen with circular ornamentation (23, arrow), crista marginalis (22), SVVC in advalvar view with digit fimbriae (25, arrowhead), large RV axial concave area (26). Scale bars = 6 µm (24), 5 µm (26), 4 µm (21), 3 µm (25), 1 µm (22–23).
FIGURES 12–20 in Planothidium lagerheimii comb. nov. (Bacillariophyta, Achnanthales) a forgotten diatom from South America
FIGURES 12–20. SEM images of Planothidium lagerheimii comb. nov. Fig. 12. External view of rapheless valve. Fig. 13. Internal view of raphe valve. Fig. 14. External view of raphe valve. Fig. 15. Internal view of rapheless valve. Fig. 16. Detail of well-developed helictoglossa. Fig. 17. Detail of rapheless valve showing conspicuous grooves and multiseriate striae. Fig. 18. Internal detail of thick silicified virgae of rapheless valve. Fig. 19. Internal detail of uniseriate striae of raphe valve. Fig. 20. Internal detail of rapheless valve showing a well-developed cavum.
FIGURES 1–11. Planothidium lagerheimii comb. nov. Figs 1–6 in Planothidium lagerheimii comb. nov. (Bacillariophyta, Achnanthales) a forgotten diatom from South America
FIGURES 1–11. Planothidium lagerheimii comb. nov. Figs 1–6: Reproduction of original drawings. Figs 1–2. Cocconeis lagerheimii Cleve (1894b, pl. 3, figs 21–22). Figs 3–4. Cocconeis rudis Frenguelli (1953, pl. 1, figs 11–12). Figs 5–6. Achnanthes salvadoriana Hustedt (1953, fig. 1). Figs 7–11. LM images of Planothidium lagerheimii population from southern Brazil (Rio Grande do Sul, Santa Cruz do Sul, Preto Stream, Rio Pardo hydrographical basin).
FIGURES 64–71 in Morphology of Australoneis gen. nov. and A. frenguelliae comb. nov. (Achnanthales, Bacillariophyta) from the Antarctic Peninsula
FIGURES 64–71. SEM images of Australoneis frenguelliae comb. nov. 64–65, 67, 69 from sample LPC 15910 (untreated); 66, 70–71 from sample LPC 15908 (treated); 68 from sample LPC 15911 (untreated). RV internal views. 64. Valve with partially broken RVVC, open at one pole (arrow). 66. RV showing raised axial structures and marginal virgae. 68. Tilted valve showing flat virgae at mid-valve and more raised marginal virgae, more prominent towards the margin (arrows). 65. Detail of raised axial structure and marginal virgae. Note undulated RVVC with fimbria-like undulations attached to the virgae (arrowheads) and a second, flat copula (arrow). 67. Detail of valve margin showing broken, hollow RVVC (arrowhead) with "fimbriae" attached to the raised virgae (arrow). 69. Round areolae occluded by hymen perforated by radial slits. 70. Detail of the valve apex showing distal raphe ending with prominent helictoglossa. 71. Detail of the prominent central nodule showing proximal raphe endings bent in opposite directions. Scale bars: 200 nm (Fig. 69), 1 µm (Figs 65, 67, 70–71), 5 µm (Figs 64, 66, 68).
FIGURES 30–35 in Morphology of Australoneis gen. nov. and A. frenguelliae comb. nov. (Achnanthales, Bacillariophyta) from the Antarctic Peninsula
FIGURES 30–35. LM images of Australoneis frenguelliae comb. nov. Sample LPC 15911 (slide c, untreated). SV at different focus levels showing SVVC still in place. Note short pegged SVVC fimbriae (arrows). Scale bar: 10 µm.
FIGURES 36–44 in Morphology of Australoneis gen. nov. and A. frenguelliae comb. nov. (Achnanthales, Bacillariophyta) from the Antarctic Peninsula
FIGURES 36–44. SEM images of Australoneis frenguelliae comb. nov. 36–39, 41 from sample LPC 15910 (untreated); 40, 42–44 from sample LPC 15908 (treated). SV external views. 36. Valve in face view. Note crista marginalis and transapical raised structures. 37. Valve in face view and underlying detached fimbriate SVVC (arrow). 38. Detail of the valve apex. 39. Detail of valve margin showing multiple pores at the end of the stria (arrow) above the shallow furrow (arrowhead) delimiting valve face from valve mantle. 40. Detail of nonareolate mid-valve zone showing embossed transapical structures (arrow) and scattered small pores (arrowheads). Note the numerous small silica warts covering the valve face. 41. Mid-valve short stria showing pegged areolae. 42. Areola of marginal stria occluded by hymen with radial slits and supported by one peg. 43. Detail of valve margin showing multiple pores with rimmed openings (arrow). Note that some of the areolae are round and with hymenes not pegged (arrowheads). 44. Detail of the marginal pores showing rimmed to shortly conical external openings (arrows). Scale bars: 200 nm (Figs 42, 44), 500 nm (Figs 41, 43), 1 µm (Fig. 39), 2 µm (Figs 38, 40), 5 µm (Figs 36–37).
FIGURES 1–29 in Morphology of Australoneis gen. nov. and A. frenguelliae comb. nov. (Achnanthales, Bacillariophyta) from the Antarctic Peninsula
FIGURES 1–29. LM images of Australoneis frenguelliae comb. nov. 1–2, 3–4, 24 from sample LPC 15911 (slide c, untreated); 12, 15–16, 28 from sample LPC 15910 (slide a, treated); 5–8, 10–11, 13, 17, 19–23, 27 from sample LPC 15908 (slide c, untreated); 9, 14, 18, 25–26, 29 from sample LPC 15908 (slides a and b, treated). 1–2. Complete frustule showing SV with hyaline structures splitting marginal and mid-valve striae (Fig. 1) and RV with filiform raphe and finely areolate mid-valve striae (Fig. 2). 3–14. Decreasing size series of SV. Note the variation in valve outline and in the extension of mid-valve striae. 15–29. Decreasing size series of RV. Note strong axial and transapical structures, raised axial area and prominent central nodule. Scale bar: 10 µm. Scale bar is the same for all LM figures.
FIGURES 72–75 in Morphology of Australoneis gen. nov. and A. frenguelliae comb. nov. (Achnanthales, Bacillariophyta) from the Antarctic Peninsula
FIGURES 72–75. SEM images of Australoneis frenguelliae comb. nov. 72–74 from sample LPC 15911 (untreated); 75 from sample LPC 15910 (untreated). RV internal views with parts of the copulae still in place. 72. Second copula, open at one pole (arrow). 73–74. Valves showing broken, hollow RVVC (arrowheads) and thicker, no fimbriate copulae (arrows). 75. Detail of the valve in Fig. 64 with partially broken SVVC. Note unbroken portion to the left (arrow) and broken portion to the right, showing the hollow, tubular nature of the SVVC (framed arrowhead) and wavy "fimbriae" attached to virgae (arrowheads). Scale bars: 2 µm (Figs 74–75), 5 µm (Figs 72–73).
FIGURES 45–54 in Morphology of Australoneis gen. nov. and A. frenguelliae comb. nov. (Achnanthales, Bacillariophyta) from the Antarctic Peninsula
FIGURES 45–54. SEM images of Australoneis frenguelliae comb. nov. 45, 47, 49 from sample LPC 15908 (treated); 46, 48, 50–51, 54 from sample LPC 15910 (untreated); 52–53 from sample LPC 15908 (untreated). SV internal views. 45, 47, 49. SV without copulae. Note the variable extension of the mid-valve striae. 46. Detail of an elliptic, bi- to triseriate mid-valve stria. 48. Detail of a roughly triangular, multiseriate marginal stria. 50. Areolae of marginal stria occluded by hymenes with radial slits. 51, 54. Detail of the valve margin showing pores occluded by domed hymenes and lying in shallow marginal chamber-like depressions (arrows). 52. SV with SVVC still in place. Note pegged fimbriae lying on the raised virgae (arrows). 53. Detail of the valve apex showing the open SVVC (arrow). Scale bars: 200 nm (Figs 46, 50), 500 nm (Fig. 48), 1 µm (Figs 51–54), 5 µm (Figs 45, 47, 49).
FIGURES –. Relatively rare Achnanthales (SEM, New Caledonia, Melanesia). Cocconeis margaritata Riaux-Gobin & Al-Handal, oblong SV areolae bordered by siliceous small beads (37–38), Cocconeis paucistriata Riaux-Gobin, Romero, Compère & Al-Handal (39, 40), SV striae composed of a unique areola on each side of the SV sternum (40, arrow), two (to three) marginal areolae (39, 40), simple process apertures on SV mantle (40, twin arrowheads). Cocconeis sigillata Riaux-Gobin & Al-Handal (41), low marginal crista marginalis and biseriate striae (41, arrowhead) split in two parts by an axial raised area. Achnanthidium glyphos Riaux-Gobin, Compère & Witkowski (42), naviculoïd SV shape, one row of marginal oblong SV areolae (42, arrowhead). See the RV of these taxa on their original description (refs cited above). Scale bars = 3 µm (37), 2 µm (42), 500 nm (40), 400 nm (38). in Marine Achnanthales (Bacillariophyceae) from New Caledonia (Melanesia): assemblage specificities, ultramafic environment
FIGURES –. Relatively rare Achnanthales (SEM, New Caledonia, Melanesia). Cocconeis margaritata Riaux-Gobin & Al-Handal, oblong SV areolae bordered by siliceous small beads (37–38), Cocconeis paucistriata Riaux-Gobin, Romero, Compère & Al-Handal (39, 40), SV striae composed of a unique areola on each side of the SV sternum (40, arrow), two (to three) marginal areolae (39, 40), simple process apertures on SV mantle (40, twin arrowheads). Cocconeis sigillata Riaux-Gobin & Al-Handal (41), low marginal crista marginalis and biseriate striae (41, arrowhead) split in two parts by an axial raised area. Achnanthidium glyphos Riaux-Gobin, Compère & Witkowski (42), naviculoïd SV shape, one row of marginal oblong SV areolae (42, arrowhead). See the RV of these taxa on their original description (refs cited above). Scale bars = 3 µm (37), 2 µm (42), 500 nm (40), 400 nm (38).
FIGURES 55–63 in Morphology of Australoneis gen. nov. and A. frenguelliae comb. nov. (Achnanthales, Bacillariophyta) from the Antarctic Peninsula
FIGURES 55–63. SEM images of Australoneis frenguelliae comb. nov. 55–57, 61–63 from sample LPC15910 (untreated); 58–60 from sample LPC 15908 (treated). RV external views. 55, 57. Complete frustules showing cingulum composed of at least 5 copulae. Note in zigzag hyaline axial area in the RV delimiting a concave mid-valve zone and a raised marginal zone. 56. Detail of Fig. 55 showing the marginal rim surrounding RV (arrow) and ligulate copulae (arrowheads). 59. Valve face. Note the different areola sizes and arrangement between marginal and mid-valve zones. 58. Detail of valve apex showing distal raphe ending terminating in a large and round pore. 60. Detail of the central area showing proximal raphe endings relatively close to each other and with tear-shaped pores. 61. Detail of the valve marginal zone showing striae with multiple, randomly arranged areolae and slightly concave virgae. 62. Round areolae of marginal striae. 63. Detail of the areolae occluded by hymen perforated by slits of different lengths. Scale bars: 200 nm (Figs 62–63), 1 µm (Figs 58, 60–61), 2 µm (Fig. 56), 5 µm (Figs 55, 57, 59).
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