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28 results for “Gyrosigma”
FIGURES 19–22 in Gyrosigma xiamenense sp. nov. (Bacillariophyta) from the middle intertidal zone, Xiamen Bay, southern China
FIGURES 19–22. Gyrosigma xiamenense sp. nov., internal views, SEM. 19. A whole valve, note that the raphe has single curvature only. 20. Apex, showing an isolated crescent of apical pores (three curved arrows), a row of areolae closest to the raphe sternum is capped by small projections (three arrows) on the primary side whilst these are absent on the secondary side. 21. Central area, showing thickened central bars with undulating outer edges. Proximal raphe endings club-shaped and wide, then the final parts of the two raphe endings form two T-shaped slits, each slit being separated from the club-shaped part by a tiny bridge (two arrows). There is a vermiform bar (curved arrow) in the middle of the nodule. 22. Central area, showing a row of areolae closest to the raphe sternum capped by small projections (four arrows), which continue up to the central bar on the primary side whilst on the secondary side these are absent. Scale bars = 20 μm (in Fig. 19), 1 μm (in Figs 20–22).
FIGURE 1 in Gyrosigma xiamenense sp. nov. (Bacillariophyta) from the middle intertidal zone, Xiamen Bay, southern China
FIGURE 1. Map of the study site showing the middle intertidal zone of sampling: DDI = Dadeng Island, YTV = Yangtang Village, CD = Caidian, HT = Houtian, JG = Jiageng, and YMC = Yuemeichi.
FIGURES 10–15 in Gyrosigma xiamenense sp. nov. (Bacillariophyta) from the middle intertidal zone, Xiamen Bay, southern China
FIGURES 10–15. Gyrosigma xiamenense sp. nov., 10–12. External views. 13–15. Internal views, LM. 10, 12, 13, 15. Apex, note the apical pores are distinctive. 11. Central area, note the shadows of central bars. Scale bars = 10 μm for all figures.
FIGURES 2–9 in Gyrosigma xiamenense sp. nov. (Bacillariophyta) from the middle intertidal zone, Xiamen Bay, southern China
FIGURES 2–9. Gyrosigma xiamenense sp. nov., 2–7. External views. 8–9. Internal views, LM. 2–4. Three valves belonging to one type of valves, either epivalves or hypovalves. 3. Photograph of holotype specimen. 5–7. Three valves belonging to the other type of valves, either epivalves or hypovalves. 5. Photograph of isotype. 8–9. Internal views of two types of valves. Scale bars = 20 μm for all figures.
FIGURES 16–23 in Typification and taxonomy of Gyrosigma tenuissimum (W. Sm.) J.W. Griffith & Henfr., comparison with Gyrosigma coelophilum N. Okamoto & Nagumo and description of two new taxa: Gyrosigma tenuissimum var. gundulae var. nov. and Gyrosigma baculum sp. nov. (Pleurosigmataceae, Bacillariophyta)
FIGURES 16–23. Gyrosigma tenuissimum, additional populations, SEM images. Fig. 16. general view, internal. Bar = 20 µm. Fig. 17. Apex, internal. Bar = 4 µm. Fig. 18. centre, internal. Bar = 4µm. Fig. 19. apex, internal. Bar = 4 µm. Fig. 20. general view, external. Bar = 20 µm. Fig. 21. apex, external. Arrow marks apical pore. Bar = 3 µm. Fig. 22. centre, external. Bar = 3 µm. Inset: detail (2x enlargement) showing raphe fissure ends. Fig. 23. apex, external. Arrow marks apical pore. Bar = 3 µm.
FIGURES 11–15 in Typification and taxonomy of Gyrosigma tenuissimum (W. Sm.) J.W. Griffith & Henfr., comparison with Gyrosigma coelophilum N. Okamoto & Nagumo and description of two new taxa: Gyrosigma tenuissimum var. gundulae var. nov. and Gyrosigma baculum sp. nov. (Pleurosigmataceae, Bacillariophyta)
FIGURES 11–15. Gyrosigma tenuissimum, additional populations, LM images. Fig. 11. Specimen from BRM ZU8/73, Sicily. Stitch of 3 stacks of 9, 6, and 9 images respectively. Bar = 10 µm. Fig. 12. Another specimen from BRM ZU 8/73, stitch of 2 stacks of 6 and 7 images respectively. Bar = 10 µm. Fig. 13. LM specimen from BRM ZU 8/35, Sardinia. Stitch of 3 stacks of 14, 12 and 9 images respectively. Bar = 20 µm. Inset: detail of striation, bar = 2 µm. Fig. 14. LM of another specimen from BRM ZU 8/35, Sardinia. Stitch of 2 stacks of 17 and 16 images respectively. Bar = 20 µm. Fig. 15. LM of specimen from Hvar, Adriatic Sea. Stitch of 3 stacks of 14, 10 and 12 images respectively. Bar = 20 µm.
FIGURES 28–36. Gyrosigma tenuissimum var. gundulae, type material. Figures 28, 30, 31 in Typification and taxonomy of Gyrosigma tenuissimum (W. Sm.) J.W. Griffith & Henfr., comparison with Gyrosigma coelophilum N. Okamoto & Nagumo and description of two new taxa: Gyrosigma tenuissimum var. gundulae var. nov. and Gyrosigma baculum sp. nov. (Pleurosigmataceae, Bacillariophyta)
FIGURES 28–36. Gyrosigma tenuissimum var. gundulae, type material. Figures 28, 30, 31. LM images. Fig. 28. Holotype, general view. Stitch of 5 stacks of 15–20 images each. Bar = 30 µm. Fig. 30. Enlargement showing centre, note resolution of vestigial (upper) and continuous (lower) central bars. Bar = 1 µm. Fig. 31. Apex showing irregular striation. Bar = 3 µm. Figures 29, 32–36. SEM images. Fig.29. General view. Bar = 30 µm. Fig. 32. Apex, external view. Arrow indicates small accessory pore. Bar = 3 µm. Fig. 33. Centre, external view. Bar = 3 µm. Inset: 1.5x enlargement of Fig. 33 showing overlapping central raphe fissures. Fig. 34. Apex, internal view. Bar = 3 µm. Fig 35. Centre, internal view. Note sideways twisting of raphe fissures. Bar = 3 µm. Inset: 1.5x enlargement showing vestigial central bars. Fig. 36. Vestigial central bars of another specimen. Bar = 1.5 µm.
FIGURES 23–28 in Gyrosigma dongtingense sp. nov. (Bacillariophyta) from Dongting Lake, China
FIGURES 23–28. Gyrosigma dongtingense, sp. nov., SEM. 23, 24. Two apices in external view showing the apical field pores, i.e., an isolated row of pores (arrows), a row of rounded areolae (arrowheads), and the triangle terminal area (asterisks). 25, 26. Two apices in internal view showing the apical field pores (e.g., arrows, Fig. 24), a row of rounded areolae (arrowheads), the triangle-shaped terminal area (asterisks), the axial costa (wavy arrows), and a groove (double-headed arrows) between the primary side (#'s) of the raphe sternum and the axial costa (wavy arrows). 27, 28. Two apices at lower magnification showing the more developed primary side of the sternum (Fig. 27, double-headed arrow, external view; Fig. 28, arrows, internal view), the internal axial costa (Fig. 28, wavy arrows), and the groove between the primary side of the raphe sternum and the axial costa. Scale bar = 1 μm (Figs 21–24), 10 μm (Figs 25, 26).
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