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33 results for “Oricymba”
FIGURES 22–25 in Oricymba tianmuensis sp. nov., a new cymbelloid species (Bacillariophyceae) from Tianmu Mountain in Zhejiang Province, China
FIGURES 22–25. Oricymba tianmuensis, SEM. Internal view of a whole valve. 24. Internal view of valve centre showing internal stigma openings. 25. Internal view of the pole with helictoglossae and apical pore field. Scale bars = 20 μm (Figs 22, 23) and 5 μm (Figs 24, 25).
FIGURES 11–18. Oricymba tianmuensis, SEM. 11 in Oricymba tianmuensis sp. nov., a new cymbelloid species (Bacillariophyceae) from Tianmu Mountain in Zhejiang Province, China
FIGURES 11–18. Oricymba tianmuensis, SEM. 11. External view of a whole valve. 12. Girdle view. 13–14. External view of pole with apical pole field. 15. External view of valve center showing striae, stigma and shallow circular impressions. 16. Details of a fractured ridge. 17. Girdle view of pole showing ridge and groove. 18. Details of striae and external areola openings in the girdle. Scale bars = 20 μm (Figs11–12), 2 μm (Fig. 13), 3 μm (Fig. 14), 5 μm (Figs 15–17) and 1 μm (Fig. 18).
FIGURES 1–10 in Oricymba tianmuensis sp. nov., a new cymbelloid species (Bacillariophyceae) from Tianmu Mountain in Zhejiang Province, China
FIGURES 1–10. Oricymba tianmuensis, LM, DIC. 1–9. Valve views, showing the valve variability of the holotype population. 10. Girdle view. Scale bar = 10 μm.
FIGURES 19–21 in Oricymba tianmuensis sp. nov., a new cymbelloid species (Bacillariophyceae) from Tianmu Mountain in Zhejiang Province, China
FIGURES 19–21. Oricymba tianmuensis (teratological form), SEM. Fig. 19. External view of a whole valve. 20. External view of valve center showing uniseriate-biseriate striae and stigma. 21. External view of pole with raphe endings. Scale bars = 20 μm (Fig. 19), 5 μm (Fig. 20) and 10 μm (Fig. 21).
FIGURES 108–113 in The diatom genus Oricymba in Vietnam and Laos with description of one new species, and a consideration of its systematic placement
FIGURES 108–113. Oricymba voronkinae sp. nov. 108. external view. 109–113, internal views. 108. Girdle view showing distinct marginal ridge and striae extending from valve face to mantle. 109. Low magnification valve view with distinct central nodule present. 110, 111. Central area demonstrating lack of an intermission and two elongate-elliptical stigma openings occluded by a dendritic structure. 112, 113. Apices with distinct helictoglossae offset from axial area. Siliceous granules are present around aveoli. Porelli area restricted to the mantle. Scale bars = 5 μm in Fig. 108; 10 μm in Fig. 109; 1 μm in Figs 110, 112; 0.5 μm in Figs 111, 113.
FIGURES 74–101 in The diatom genus Oricymba in Vietnam and Laos with description of one new species, and a consideration of its systematic placement
FIGURES 74–101. Oricymba voronkinae sp. nov. LM. Valve views showing size range. Holotype is illustrated in Fig. 75. Scale bar = 10 μm.
FIGURES 70–73 in The diatom genus Oricymba in Vietnam and Laos with description of one new species, and a consideration of its systematic placement
FIGURES 70–73. Oricymba perjaponica, comb. nov. SEM, external views. 70. Low magnification valve view. The arched raphe and stigma opening are evident. 71. Central area showing dilated proximal raphe ends and round stigma opening. Rectangular striae with subtending dendritic coverings are evident. 72. Axial area showing striae structure and presence of marginal ridges. 73. Apex with pore field porelli physically separate and structurally differentiated from areolae. The distal raphe end does not bisect the pore field. Scale bars = 10 μm in Fig. 70, 1 μm in Figs 71, 72 and 0.5 μm in Fig. 73.
FIGURES 102–107 in The diatom genus Oricymba in Vietnam and Laos with description of one new species, and a consideration of its systematic placement
FIGURES 102–107. Oricymba voronkinae sp. nov. SEM, external views. 102, 103. Low magnification valve views showing arched raphe and round stigma opening. 104, 105. Central area with dilated proximal raphe ends and round stigma opening. Marginal ridge is evident. 106. View of striae with the overlay of silica to form the characteristic striae with subtending dendritic coverings. The marginal ridge is evident. 107. Apex with strongly hooked distal raphe end not bisecting the apical pore field. Pore field restricted to mantle. Scale bars = 10 μm in Figs 102, 103; 1 μm in Fig. 104; 2 μm in Fig. 105; 0.5 μm in Figs 106, 107.
FIGURES 56–69 in The diatom genus Oricymba in Vietnam and Laos with description of one new species, and a consideration of its systematic placement
FIGURES 56–69. Oricymba perjaponica, comb. nov.. LM. Valve views showing size range. Scale bar = 10 μm.
FIGURES 50–55. Oricymba subovalis. 50, 51 in The diatom genus Oricymba in Vietnam and Laos with description of one new species, and a consideration of its systematic placement
FIGURES 50–55. Oricymba subovalis. 50, 51, external views; 52–55, internal views. 50, 51. Apices of valve, showing apical pore fields not bisected by distal raphe ends and porelli restricted to the mantle. 52. Low magnification view of valve. 53, 54. Central area showing the raphe lacks an intermissio, and the two stigma opening are occluded by dendritic structures. Siliceous nodules line the striae openings. 55. Apex with a distinct helictoglossa evident. Porelli are occluded by siliceous granules. Scale bars = 0.5 μm in figs 50, 54, 55; 1 μm in figs 51, 53; 10 μm in fig. 52.
FIGURES 44–49. Oricymba subovalis. SEM, external views. 44–46 in The diatom genus Oricymba in Vietnam and Laos with description of one new species, and a consideration of its systematic placement
FIGURES 44–49. Oricymba subovalis. SEM, external views. 44–46, low magnification view showing general nature of the valves. Note the absence of the marginal ridge. 47, 48. Central area showing the dilated proximal raphe ends, prominent, round stigma opening and narrowly rectangular areolae with dendritic internal coverings. 49. Axial area with arched raphe and striae with hemispherical areoale along the axial area. Scale bars = 10 μm in figs 44, 45; 5 μm in fig. 46; 1 μm in figs 47–49.
FIGURES 22–25 in The diatom genus Oricymba in Vietnam and Laos with description of one new species, and a consideration of its systematic placement
FIGURES 22–25. Oricymba japonica, SEM, external views. 22. Low magnification view showing overview of valve. The arched nature of the raphe is evident. 23. Central area with dilated proximal raphe ends, rounded stigma opening and corroded or incompletely formed striae. 24. Axial area showing arched raphe. 25. Apex, with highly deflected distal raphe end and porelli of the apical pore field evident. Scale bars = 1 μm.
FIGURES 22–26 in Oricymba rhynchocephala sp. nov., a new cymbelloid diatom (Bacillariophyceae) from Xianju National Park in Zhejiang Province, China
FIGURES 22–26. Oricymba rhynchocephala, SEM, internal views. 22. Entire valve with raphe slit evident down the center and a helictoglossa at each apex. 23. Valve centre showing two internal stigma openings each occluded with small, tooth-like projections and small, relatively undifferentiated central nodule without an intermissio. 24. Striae formed by slit-like, elongate areolae separated by robust silica ribs. 25–26. Views of the apices with helictoglossae and apical pore fields evident. Scale bars = 10 μm (Fig. 22) and 2 μm (Figs 23–24) and 5 μm (Figs 25–26).
FIGURES 15–21 in Oricymba rhynchocephala sp. nov., a new cymbelloid diatom (Bacillariophyceae) from Xianju National Park in Zhejiang Province, China
FIGURES 15–21. Oricymba rhynchocephala, SEM, external views. 15. Entire valve. Notice the distinct marginal ridge, proximal raphe ends and rounded, single ventrally-placed stigma opening. Striae appear slit-like. Distal raphe ends deflect dorsally. 16. Valve center showing striae, stigma, dilated proximal raphe ends, and shallow circular depressions. 17. High magnification view of the thickened marginal ridge and areolae with small tooth-like projections. 18. View of the valve mantle and overlapping girdle band with a single row of poroids. 19. Rostrate apices with strongly deflected distal raphe end and porellis of the apical pore field positioned entirely on the valve mantle. 20–21. External view of apices showing apical pole fields with porelli that are comprised of small round holes, differentiated morphologically and physically separated from the striae. Scale bars = 10 μm (Fig 15), 5 μm (Fig. 16), 2 μm (Figs 17–19) and 1 μm (Figs 20–21).
FIGURES 1–14 in Oricymba rhynchocephala sp. nov., a new cymbelloid diatom (Bacillariophyceae) from Xianju National Park in Zhejiang Province, China
FIGURES 1–14. Oricymba rhynchocephala, LM, DIC. Valve views, showing variability of the holotype population. Fig. 5 is of the holotype. Scale bar = 10 μm.
FIGURES 2–11 in Oricymba sagarensis (Gandhi) comb. nov., an endemic diatom from the Western Ghats, India
FIGURES 2–11 Oricymba sagarensis. LM, DIC. 2–10. Valve view. Fig. 11. O. sagarensis girdle view. Scale bars: Figs. 1–10: 10 µm.
FIGURE 1 in Oricymba sagarensis (Gandhi) comb. nov., an endemic diatom from the Western Ghats, India
FIGURE 1 Map showing the type localities of Oricymba species and most of the description are from the South and Southeast Asia. Numbers representing the type localities of species of Oricymba. (1= O. japonica, 2= O. subovalis, 3= O. perjaponica, 4= O. tianmuensis, 5= O. sagarensis, 6= O. subaequalis, 7= O. latirotundata, 8= O. rhynchocephala, 9= O. voronkinae, and 10= O. xianjuensis).
FIGURES 17–21 in Oricymba sagarensis (Gandhi) comb. nov., an endemic diatom from the Western Ghats, India
FIGURES 17–21 Oricymba sagarensis. SEM. Internal view of a whole valve. 18. Internal view of centre valve showing internal stigma opening. 19, 21. Internal view of the pole with apical pore field. 20. Internal view striae. Scale bars: Fig. 17: 2 µm; Figs.18–21: 1 µm.
FIGURES 12–16 Oricymba sagarensis. SEM. 12 & 16 in Oricymba sagarensis (Gandhi) comb. nov., an endemic diatom from the Western Ghats, India
FIGURES 12–16 Oricymba sagarensis. SEM. 12 & 16. External view of whole valve. 13–14. External view of poles with apical pore field. 15. External view of valve center, showing stigma, striae and proximal raphe ending. 16. External view of girdle view showing the uniseriate striae extending to the valve mantle. Scale bars: Fig. 12: 2 µm; Figs.13–16: 1 µm.
FIGURES 10–16 in Oricymba gongshanensis sp. nov. (Cymbellaceae; Bacillariophyceae), a new species from southwest China
FIGURES 10–16 Oricymba gongshanensis, SEM, external views. Figs 10, 11. External view of an entire valve. Figs 12–14. Valve apices, striae with elliptic/rounded areolae and pore field separated by the distal raphe fissures. Figs. 15, 16. External view of valve center, the proximal raphe endings and the very large central area with a stigma. Scale bar = 3 μm (Fig. 16), 2 μm (Figs 10–12, 15), 1 μm (Figs 13–14).
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