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74 results for “Nitzschia”
FIGURES 30–39 in Two new Nitzschia species (Bacillariophyceae) from China, possessing a canal-raphe-conopeum system
FIGURES 30–39. Nitzschia gaoi, sp. nov., external views, SEM. 30–31. Two complete valves, note the nitzschioid symmetry of the raphe system. 32–33. Apices, note the constant width of the conopeum. 34–35. Apices showing the apical pore fields and the hooked terminal fissures towards the dorsal side. 36. Intact central area, showing costae, conopea, and the fusing of costae with conopeal spines (arrowheads). 37. Eroded area showing small conopea occuring on each side of each costa, and a transverse row of areolae appearing in a girdle band. 38. Eroded area showing striae and areolae. 39. Broken central area, showing the canal-raphe-conopeum system (cc = conopeal canal). Scale bars = 10 μm (Figs 30–31), 1 μm (Figs 32–39).
FIGURES 40–44 in Two new Nitzschia species (Bacillariophyceae) from China, possessing a canal-raphe-conopeum system
FIGURES 40–44. Nitzschia gaoi, sp. nov., internal views, SEM. 40. A whole valve, note the upper apex very slightly arched toward the ventral side. 41–42. Apices, note one apex bending toward the ventral side (Fig. 41, two arrows) and the other almost straight (Fig. 42, two arrows). 43. Central area, note that the zone of valve face subtended by the conopeum (cv) has no areolae in most part but these are present near or on the wall of raphe canal (arrow). 44. Detail of the apex, note the distinctive apical pore field (arrow). Scale bars = 10 μm (Fig. 40), 1 μm (Figs 41–44).
FIGURE 1 in Rare interspecific breeding in Pseudo-nitzschia (Bacillariophyceae)
FIGURE 1. Key hybrid stages observed in sexual reproduction between Pseudo-nitzschia pseudodelicatissima and P. arenysensis, SEM (a–b), LM c., and TEM (d–f) micrographs. a. Two auxospores attached to the gametangial frustule. b. One mature auxospore. c. A postinitial cell. d. Central portion of the valve in which the central larger interspace is visible, strain 128–1. e. Detail of the central portion of the valve. f. The three cingular bands delimited by vertical lines: VC valvocopula, II second cingular band, III third cingular band. Scale bars = 10 μm (a–c), 1 μm (d), 0.5 μm (e–f).
FIGURE 2 in Rare interspecific breeding in Pseudo-nitzschia (Bacillariophyceae)
FIGURE 2. Ultrastructure of the parental strains. a. Central portion of the valve in which the central larger interspace is visible, strain 18–02 and b: strain B110. Scale bars = 0.5 μm (a), 1 μm (b).
FIGURE 27 in Nitzschia austriaca Hustedt: a characteristic diatom of Hungarian inland saline waters including a morphological comparison with the type material
FIGURE 27. Box plots showing variation in chemical variables, (a) conductivity (mS cm-1), (b) pH, (c) TSS (mg L-1) and (d) TP (mg L-1) values of ponds, in which N. austriaca is present (1) or absent (0).
FIGURES 20–24 in Nitzschia austriaca Hustedt: a characteristic diatom of Hungarian inland saline waters including a morphological comparison with the type material
FIGURES 20–24. SEM micrographs of N. austriaca from the type material (sample E9708 from Austria). Arrow indicates the central nodule on Fig. 24.
FIGURE 25 in Nitzschia austriaca Hustedt: a characteristic diatom of Hungarian inland saline waters including a morphological comparison with the type material
FIGURE 25. The Hungarian occurrences of N. austriaca. Dot: Hungarian surveillance monitoring and our former data, star: data from present study.
FIGURES 14–19 in Nitzschia austriaca Hustedt: a characteristic diatom of Hungarian inland saline waters including a morphological comparison with the type material
FIGURES 14–19. SEM micrographs of N. austriaca from the Apaj population (Hungary). White arrows indicate the central raphe endings on Fig. 15 and the central nodule on Fig. 18.
FIGURE 1 in Nitzschia austriaca Hustedt: a characteristic diatom of Hungarian inland saline waters including a morphological comparison with the type material
FIGURE 1. Ordination diagram of NMDS (a) with the 95% confidence interval (point: population of Apaj, plus: population of type material) and the Shepard plot (b). R2=0.95.
FIGURES 31–36 in Valve ultrastructure of Nitzschia shanxiensis nom. nov., stat. nov. and N. tabellaria (Bacillariales, Bacillariophyceae), with comments on their systematic position
FIGURES 31–36. SEM micrographs of Nitzschia tabellaria. 31. External view of the valve, showing the swollen valve with a simple ridged keel. 32. Central area showing the raphe is filiform and without central raphe ending. 33. Valve terminus showing the hooked raphe ends. 34. Internal view of the valve, showing the canal raphe subtended by fibulae. 35. Internal view of valve center showing the fibulae structures. 36. Distal raphe ends showing helictoglossae and are positioned on the mantle at the apices.
FIGURES 25–30 in Valve ultrastructure of Nitzschia shanxiensis nom. nov., stat. nov. and N. tabellaria (Bacillariales, Bacillariophyceae), with comments on their systematic position
FIGURES 25–30. SEM micrographs of Nitzschia shanxiensis. 25. External view of the valve, showing the keel extending marginally from apex to apex. 26. Central area showing the raphe is without central raphe ending, areolae are circular to elongate. 27. Valve terminus showing the hooked raphe ends. 28. Internal view of the valve, showing the canal raphe subtended by fibulae. 29. Internal view of valve center showing the fibulae structures. 30. Distal raphe ends showing helictoglossae and are positioned on the mantle at the apices.
FIGURES 1–24 in Valve ultrastructure of Nitzschia shanxiensis nom. nov., stat. nov. and N. tabellaria (Bacillariales, Bacillariophyceae), with comments on their systematic position
FIGURES 1–24. LM micrographs of Nitzschia shanxiensis and Nitzschia tabellaria. 1–12: Nitzschia shanxiensis. 13–24: Nitzschia tabellaria. Scale bar: 10 μm.
FIGURES 59–63 in Two new species of Nitzschia (Bacillariaceae, Bacillariophyta) from tropical reservoirs of southeastern Brazil
FIGURES 59–63. Type material of N. autralodesertorum sp. nov., SEM. 59–61. Valve face in internal view showing margin, fibulae, areolae, virgae, helictoglossae and raphe side mantle in external view. 62. Central valve face in internal view showing margin, fibulae, areolae, and raphe side mantle in external view. 63. Central valve face in internal view showing margin, fibulae, interfibular spaces and areolae. Gap between the central fibulae (arrow). Scale bars: Figs 59–61 = 5 μm; Fig 62–63 = 1 μm.
FIGURES 2–31 in Two new species of Nitzschia (Bacillariaceae, Bacillariophyta) from tropical reservoirs of southeastern Brazil
FIGURES 2–31. Related species of Nitzschia found in the Nitzschia pusilluhasta sp. nov. type material. 2–21. Nitzschia pusilluhasta sp. nov., LM. 2–17. Valve view. 18–21. Girdle view. Figures 22–26. Nitzschia amphibia. LM. Valve view. Figures 27–31. Nitzschia semirobusta. LM. Valve view. Figures marked with "=" are the same frustules with a different focus. Scale bar = 10 μm.
FIGURE 1. A in Two new species of Nitzschia (Bacillariaceae, Bacillariophyta) from tropical reservoirs of southeastern Brazil
FIGURE 1. A. Map of Brazil showing the location of São Paulo State. B. Map of reservoir basins showing the sampling sites (dots).
FIGURES 53–58 in Two new species of Nitzschia (Bacillariaceae, Bacillariophyta) from tropical reservoirs of southeastern Brazil
FIGURES 53–58. Type material of N. pusilluhasta sp. nov., SEM. 53, 54. Valve face in external view. 55. Valve edge showing raphe, first row of areolae, mantle, and pores in the valvocopula. 56. Central portion of valve face, areolae, and raphe. 57. Girdle and valve face views, near the apex showing areolae on valve and mantle, and poroids on the copulae. 58. Apex of the valve showing areolae on the valve face and mantle, raphe, keel and valvocopula poroids. Scale bars: Figs 53, 54 = 5 μm; Fig 55 = 0.5 μm; Figs 56–58 = 1 μm.
FIGURES 64–68 in Two new species of Nitzschia (Bacillariaceae, Bacillariophyta) from tropical reservoirs of southeastern Brazil
FIGURES 64–68. Type material of N. australodesertorum sp. nov. 64, 65. SEM. Apex in internal view showing helictoglossa and areolae. Mantle in external view showing keel, virgae and mantle areolae. 66–68. TEM. 66. Valve view, pattern of striae, fibulae, and elongated areolae (arrows). 67. Areolae, areola occlusion, and elongated areolae (arrows). 68. Areolae occluded by hymenes. Scale bars: Fig 64, 65 = 1 μm; Fig 66 = 5 μm; Fig 67 = 0.5 μm; Fig 68 = 200 nm.
FIGURES 32–52 in Two new species of Nitzschia (Bacillariaceae, Bacillariophyta) from tropical reservoirs of southeastern Brazil
FIGURES 32–52. Type material of Nitzschia australodesertorum sp. nov., LM. 32–50. Valve view. 51, 52. Girdle view. Arrows indicate the gap between the central fibulae. Figures marked with "=" are the same frustules with a different focus. Scale bar = 10 μm.
FIGURES 20–26 in Two new species of Nitzschia (Bacillariophyta) from shallow wetlands of Peninsular India
FIGURES 20–26. SEM micrographs of Nitzschia taylorii sp. nov. Figs 20, 21. SEM of external girdle view showing valve bands. Fig. 22. SEM external view of areolae structure. Fig. 23. SEM internal view of entire valve. Fig 24. SEM internal view of valve apices. Fig. 25. SEM internal view showing round to rectangular shape fibulae. Fig 26. SEM external valve view showing basal margin scattered with small papillae (note arrow mark). Scale bars in Figs 20, 21, 26 = 2 µm; Figs 22, 24, 25 = 1 µm; Fig. 23 = 10 µm. (Specimens from sample CANA 85055)
FIGURES 13–19 in Two new species of Nitzschia (Bacillariophyta) from shallow wetlands of Peninsular India
FIGURES 13–19. SEM micrographs of Nitzschia taylorii sp. nov. Fig. 13. SEM of external view of the entire valve. Fig. 14. SEM of girdle view showing valve bands. Fig. 15. SEM view of valve apex with deflected raphe terminal. Figs 16–17. SEM external view of raphe, valve mantle and areolae structure. Fig. 18. SEM of external view of central area of N. taylorii showing uninterrupted raphe. Fig.19. SEM of external view of central area of N. frustulum showing interrupted raphe. Scale bar in Figs 13, 14 = 10 µm; Figs 15–19 = 2 µm. (Specimens from sample CANA 85055)
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