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59 results for “Cymbella”
FIGURES 15–20 in Cymbella alexandrovichii sp. nov. (Cymbellaceae, Bacillariophyceae), a new cymbelloid diatom species with predominantly biseriate striae from South-East Asia
FIGURES 15–20. Cymbella alexandrovichii sp. nov. SEM, type material, sample no. 01612. Internal valve surface. 15. The whole valve, note that the interstriae wider than striae (white arrows). 16–17. Details of the central areae, note the closed terminal nodule (16–17, black arrows); interstriae wider than striae (16, white arrows); rounded or elongated stigmata openings, surrounded by fine ingrowths from their perimeter (16–17, white arrowheads). 18. Internal structure of striae, note the Voigt discontinuity (18, white arrow). Alveolate striae are located in depressions between interstriae (virgae) (18, black arrows) and occlusions are absent. 19–20. Details of the apices, note the APFs (19–20, black arrows); helictoglossa (19–20, black arrowheads); the interstriae that are narrower than striae (19–20, white arrows). Scale bars = 5 µm (Fig. 15), 2 µm (Fig. 16), 1 µm (Figs 17–20).
FIGURES 1–8 in Cymbella alexandrovichii sp. nov. (Cymbellaceae, Bacillariophyceae), a new cymbelloid diatom species with predominantly biseriate striae from South-East Asia
FIGURES 1–8. Cymbella alexandrovichii sp. nov. LM, DIC, type material, slide no. 01612. Fig. 2 represents the holotype. 1–6. Size diminution series. 7. Details of the central area. 8. Details of the valve end. Scale bars = 10 μm (Figs 1–6), 2 μm (Figs 7–8).
FIGURES 9–14 in Cymbella alexandrovichii sp. nov. (Cymbellaceae, Bacillariophyceae), a new cymbelloid diatom species with predominantly biseriate striae from South-East Asia
FIGURES 9–14. Cymbella alexandrovichii sp. nov. SEM, type material, sample no. 01612. External valve surface. 9. The whole valve, note the slightly widened central branches of the raphe (white arrowheads); terminal raphe fissure (black arrowhead); Voigt discontinuities (black arrow). 10–12. Details of the central area, note the slightly widened central branches of the raphe (10, white arrowheads); biseriate (10, black arrowheads) and uniseriate striae (11, white arrowheads) with single slit-like (12, white arrows) or round (11–12, white arrowheads) areolae; ventral stigmata (10–11, black arrows). 13–14. Details of the apices, note the terminal raphe fissure (13, black arrowhead); biseriate striae on the valve mantle (13–14, black arrows); apical pore field (13–14, white arrowhead). Scale bars = 10 µm (Fig. 9), 2 µm (Figs 10, 12), 1 µm (Figs 11, 13–14).
FIGURES 21–25. Cymbella amicula stat. nov. et nom. nov. SEM external view. 21. Frustule and whole valve. 22–25 in Cymbopleura amicula stat nov. et. nom. nov. (Bacillariophyceae)-a rare diatom species from a karst river in Croatia
FIGURES 21–25. Cymbella amicula stat. nov. et nom. nov. SEM external view. 21. Frustule and whole valve. 22–25. External view of whole valves. Scale bars 5 µm (Figs 21–25).
FIGURES 26–31. Cymbella amicula stat. nov. et nom. nov. SEM internal view. 26–28 in Cymbopleura amicula stat nov. et. nom. nov. (Bacillariophyceae)-a rare diatom species from a karst river in Croatia
FIGURES 26–31. Cymbella amicula stat. nov. et nom. nov. SEM internal view. 26–28. View of the whole valve. 29, 30. Detailed view of the valve centre, showing the overgrowth of silica that covers the proximal raphe ends. 31. Detailed view of valve apex showing the small, knob-like helictoglossa. Scale bars in 10 µm (Figs 26 and 27), 5 µm (Fig. 28), 2 µm (Figs 29–31).
FIGURES 23–28 in Cymbella biseriata sp. nov.-a unique living species of Cymbella Agardh (Bacillariophyceae) with biseriate striae
FIGURES 23–28: Cymbella biseriata sp. nov. SEM from type material (MKNDC 012839). 23, 24. External views of whole valve. 25. External view of dorsal side of frustule. Transition between valve face and mantle is gradual and striae are biseriate and not interrupted on valve mantle. 26. Detail views of the mid-valve showing biseriate striae and external round openings of stigmata. 27, 28. Detail view of valve apices showing distal raphe ends and absence of APF. Scale bar = 10 μm (Figs 23–25), 5 μm (Figs 26, 28) and 2 μm (Fig. 27).
FIGURES 2–22 in Cymbella biseriata sp. nov.-a unique living species of Cymbella Agardh (Bacillariophyceae) with biseriate striae
FIGURES 2–22: Cymbella biseriata sp. nov. from type slide (MKNDC 012839A) LM, size diminution series. Scale bar = 10 µm.
FIGURE 1 in Cymbella biseriata sp. nov.-a unique living species of Cymbella Agardh (Bacillariophyceae) with biseriate striae
FIGURE 1: Map of North Macedonia with location of mountain Kozuf and the type locality, and image of the latter.
FIGURES 29–34 in Cymbella biseriata sp. nov.-a unique living species of Cymbella Agardh (Bacillariophyceae) with biseriate striae
FIGURES 29–34: Cymbella biseriata sp. nov. SEM from type material (MKNDC 012839). 29, 30. Internal views of the whole valves. 31, 32, 34. Detail view of the mid-valve. 33. Internal view of valve apices showing raphe distally terminates with large knob-like helictoglossae. Scale bar = 10 μm (Figs 29, 30), 5 μm (Figs 31, 32) and 2 μm (Figs 33, 34).
FIGURES 15–24 in Ultrastructure and taxonomic position of Cymbella latestriata Pantocsek (Bacillariophyta)
FIGURES 15–24: Cymbella latestriata, SEM. 15–18. External view of valves. Note the shape of raphe fissure. 17. A whole frustule. 19. Internal view a valve. 20–24. Details of apical pore fields on the mantle. 20, 21, 23, 24. Details of apical pore fields and distal raphe fissures, external view. 22. Internal view of pore with apical pore field. Scale bars = 10 μm on Figs 15–19. and = 1 μm on Figs. 20–24.
FIGURES 1–14 in Ultrastructure and taxonomic position of Cymbella latestriata Pantocsek (Bacillariophyta)
FIGURES 1–14 Drawings and light microscopy documentation of Cymbella latestriata and C. pachyptera. 1–3. Original drawings of C. latestriata from Bory (Fig 1.), Dúbravica (Fig. 2) and Lutila (Fig. 3.), after Pantocsek. 4, 5: LM pictures of C. latestriata after Řeháková (1980) from Dúbravica core sample. Fig. 6: C. latestriata from Lutila (present study), LM. 7. Pantocsek's original drawing of C. pachyptera from Dúbravica. 8–14. Cymbella latestriata from Lutila, LM. Scale bar = 10 μm.
FIGURES 70–86 in Type analysis of Cymbella schubartii and two new Encyonopsis species (Bacillariophyceae) from southeastern Brazil
FIGURES 70–86: Encyonopsis difficilis, São Paulo populations. Light and scanning electron micrographs. 70–80. LM views showing variation in size and valve outline. 81. SEM external view of entire valve showing the raphe and striae structure. 82. SEM internal view of entire valve. Note the shortened striae continuing around the apex. 83–84, 86. SEM internal detail of valve apex with helictoglossa. 85. SEM internal view of central area. Note the intermission. LM scale bar = 10 μm (in Figs 70–80).
FIGURE 87 in Type analysis of Cymbella schubartii and two new Encyonopsis species (Bacillariophyceae) from southeastern Brazil
FIGURE 87. Nonparametric multidimensional scaling plot of normalized coordinates for the morphological landmarks digitized on LM images of selected populations of Encyonospsis. Confidence ellipses (α = 0.95) shown.
FIGURES 36–54. Encyonopsis sanctipaulensis. 36–40 in Type analysis of Cymbella schubartii and two new Encyonopsis species (Bacillariophyceae) from southeastern Brazil
FIGURES 36–54. Encyonopsis sanctipaulensis. 36–40. LM views showing variation in size and valve outline of the Ribeirão do Campo Reservoir population. 41–54. Type material of Encyonopsis sanctipaulensis. All pictures taken from the holotype population (SP401589). Light and scanning electron micrographs. 41–50. LM views showing variation in size and valve outline. 51. SEM external view of areolae and central area. 52. SEM external view of entire valve showing the raphe and striae structure. 53. SEM internal view of central area. Note the intermissio. 54. SEM internal detail of valve apex with helictoglossa. LM scale bar = 10 μm (in Figs 36–50).
FIGURES 55–69 in Type analysis of Cymbella schubartii and two new Encyonopsis species (Bacillariophyceae) from southeastern Brazil
FIGURES 55–69. Type material of Encyonopsis linensis. Light and scanning electron micrographs. All pictures taken from the holotype population (SP355776). 55–65. LM views showing variation in size and valve outline. 66–67. SEM external view of entire valve showing the raphe and striae structure. 68. SEM external view of central area. Note the elongate foramina appearing as narrow slits and varied slits. 69. SEM internal view detail of areolae and central area with intermissio. LM scale bar = 10 μm (in Figs 55–65).
FIGURES 3–19 in Type analysis of Cymbella schubartii and two new Encyonopsis species (Bacillariophyceae) from southeastern Brazil
FIGURES 3–19. Type material of Encyonopsis schubartii. Light and scanning electron micrographs. All pictures taken from the holotype population (AM989). 3–12. LM views showing variation in size and valve outline. 13–15. SEM external views of entire valve showing the raphe and striae structure. 16. SEM external view of girdle bands. Note the line of small pores. 17–18. SEM internal detail of areolae and raphe. Note the areolae with struts providing structural support to the foramen. 17. SEM internal detail of valve apex with helictoglossa. 18. SEM internal detail of central area with intermissio. 19. SEM internal detail of the intermissio with small pores. LM scale bar = 10 μm (in Figs 3–12).
FIGURES 20–35 in Type analysis of Cymbella schubartii and two new Encyonopsis species (Bacillariophyceae) from southeastern Brazil
FIGURES 20–35. Encyonopsis schubartii, São Paulo populations. Light and scanning electron micrographs. 20–30. LM views showing variation in size and valve outline. 31–33. SEM external views of entire valve showing the raphe and striae structure. 34. SEM internal view of entire valve showing the raphe and striae structure. 35. SEM internal detail of areolae and central area with intermissio. Note the intermissio with small pores. LM scale bar = 10 μm (in Figs 20–30).
FIGURE 2 in Type analysis of Cymbella schubartii and two new Encyonopsis species (Bacillariophyceae) from southeastern Brazil
FIGURE 2. Position of the 20 landmarks (1–10, 15–24) and 4 semi-landmarks (11–14) on the valve outline used to perform the geometric morphometric analysis. Scale bar = 10 μm.
FIGURE 1 in Type analysis of Cymbella schubartii and two new Encyonopsis species (Bacillariophyceae) from southeastern Brazil
FIGURE 1. Sampling sites located in São Paulo State (Parana River basin) with the location of Encyonopsis schubartii type material and the species complex.
FIGURES 13–16 in Cymbella liyangensis sp. nov., a new cymbelloid species (Bacillariophyceae) from streams in North Tianmu Mountain, Jiangsu province, China
FIGURES 13–16. Cymbella liyangensis, SEM, internal valve views. Fig. 13. Internal view of a whole valve. Fig. 14. Internal view of valve centre showing internal stigma openings. Figs 15, 16. Internal view of valve ends with dorsally curved, knob-like helictoglossae and the biseriate to multiseriate striae. Scale bars = 10 μm (Fig 13), 5 μm (Fig 14), 2 μm (Figs 15, 16).
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