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32 results for “Cymbellales”
FIG. 5 in Encyonema keshrii, sp. nov.: a new diatom species (Cymbellales, Bacillariophyceae) from the Indian subcontinent
FIG. 5. — Light microscopy of Encyonema keshrii, sp. nov., represented from the Sharavathi River sample: A-M, valve views showing the size diminution series; N, girdle view. Scale bar: A-N, 10 µm.
FIG. 4 in Encyonema keshrii, sp. nov.: a new diatom species (Cymbellales, Bacillariophyceae) from the Indian subcontinent
FIG. 4. — Scanning electron micrographs of girdle view of Encyonema keshrii, sp. nov.: A, dorsal side; B, ventral side of whole valve, showing mantle areolae and girdle bands; C, valve apex covered with girdle bands and transapical areolae present on the valve mantle; D, central area showing the mantle areolae, ribbed valve margin and layers of girdle bands. Scale bars: A-D, 1 μm.
FIG. 3 in Encyonema keshrii, sp. nov.: a new diatom species (Cymbellales, Bacillariophyceae) from the Indian subcontinent
FIG. 3. — Scanning electron micrographs of valve interior of Encyonema keshrii, sp. nov.: A, B, whole valve view, with raphe and striation pattern; C, E valve apices, with small helictoglossae; D, central area, showing proximal raphe ends. Scale bars: A, B, 5 μm; C-E, 1 μm.
FIG. 2 in Encyonema keshrii, sp. nov.: a new diatom species (Cymbellales, Bacillariophyceae) from the Indian subcontinent
FIG. 2. — Scanning electron micrographs of valve exterior of Encyonema keshrii, sp. nov.: A, B, whole valve showing slightly dorsiventral, lanceolate to linearlanceolate valves, raphe and striation pattern; C, showing unique lineolate areolus; D, F, details of marginal and apical pole showing distal raphe ends, mantle poroids; E, middle portion of the valve showing proximal raphe ends. Scale bars: A, B, 5 µm; C, 0.25 µm; D-F, 1 µm.
FIG. 6 in Encyonema keshrii, sp. nov.: a new diatom species (Cymbellales, Bacillariophyceae) from the Indian subcontinent
FIG. 6. — Scanning electron micrographs of Encyonema keshrii, sp. nov., represented from the Sharavathi River sample: A-C, valve exterior ultrastructures; D-F, valve interior ultrastructures. Scale bars: A-F, 1 μm.
FIG. 5 in A new species of Placoneis Mereschkowsky (Bacillariophyceae: Cymbellales) from wet soils in southern Vietnam
FIG. 5. — Phylogenetic position of Placoneis asymmetricus Glushchenko, Kezlya, Kulikovskiy & Kociolek, sp. nov. (indicated in bold) within the Bacillariophyceae Haeckel based on Bayesian analysis of 60 partial rbcL and partial 18S rDNA genes sequences. Values above the horizontal lines are bootstrap support from ML analyses (<50 are not shown); values below the horizontal lines are Bayesian posterior probabilities (<90 are not shown). All sequences have strain numbers (if available) and GenBank numbers. Species from Rhopalodiaceae (Karsten) Topachevs'kyj & Oksiyuk were used as an outgroup. * is 100% statistical support.
FIG. 2 in A new species of Placoneis Mereschkowsky (Bacillariophyceae: Cymbellales) from wet soils in southern Vietnam
FIG. 2. — Placoneis asymmetricus Glushchenko, Kezlya, Kulikovskiy & Kociolek, sp. nov.: A-I, live cells with chloroplast structure; J-S, cleaned cells from strain VP57, slide no. 06728; T-Z, valves from a natural sample, slide no. 07219; A-E, J-Z, valve face; F-I, girdle views. P represents the holotype. Scale bar: 10 μm.
FIG. 3 in A new species of Placoneis Mereschkowsky (Bacillariophyceae: Cymbellales) from wet soils in southern Vietnam
FIG. 3. — SEM external views of Placoneis asymmetricus Glushchenko, Kezlya, Kulikovskiy & Kociolek, sp. nov. (strain VP57): A, entire valve; B, detail, central area; C, valve apex. Scale bars: A, 2 μm; B, C, 1 μm.
FIG. 4 in A new species of Placoneis Mereschkowsky (Bacillariophyceae: Cymbellales) from wet soils in southern Vietnam
FIG. 4. — SEM internal views of Placoneis asymmetricus Glushchenko, Kezlya, Kulikovskiy & Kociolek, sp. nov. (strain VP57): A, entire valve; B, detail, central area; C, valve apex. Scale bars: A, 2 μm; B, 1 μm; C, 0.5 μm.
FIGURES 42–46. SEM micrographs. 42–43. Planothidium frequentissimum. 42. Internal valve view showing the roundish cavum with the narrow opening. 43 in A new species of an unexplored diatom genus: Gomphosphenia minima sp. nov. (Cymbellales, Rhoicospheniaceae)
FIGURES 42–46. SEM micrographs. 42–43. Planothidium frequentissimum. 42. Internal valve view showing the roundish cavum with the narrow opening. 43. External view showing the striae composed of three rows of small rounded areolae, and straight raphe branches with expanded drop–like proximal raphe endings. 44–45. Sellaphora nigri. 44. External valve view showing the bow tie-shaped central area and the 'tear-drop' shaped proximal ends of the raphe. 45. External valve view showing the areoles closest to the raphe being larger and slightly angular, square or nearly rounded, while the marginal areoles become smaller and more circular. 46. Eunotia minor, girdle view. Scale bar = 3 µm.
FIGURES 20–26 in A new species of an unexplored diatom genus: Gomphosphenia minima sp. nov. (Cymbellales, Rhoicospheniaceae)
FIGURES 20–26. SEM micrographs of Gomphosphenia minima C. Delgado, S. Blanco, L. González-Paz & S.F.P. Almeida sp. nov. 20. Internal valve view showing the raphe ending and the transapical uniseriate striae. 21. External view of the central area showing the raphe ending slightly expanded into drop-like pores. 22. Internal view of the central area showing the raphe ending curved to one side. 23. External view of the valve showing the striae composed of a single areola. 24. Girdle view of the entire frustule showing the mantle striae composed by row of individual pores (elongated in the pervalvar direction). 25. External valve showing the narrowly rounded headpole. 26. External valve showing the narrowly rounded footpole. Scale bar = 1 μm (Figs 20–26).
FIGURES 2–19 in A new species of an unexplored diatom genus: Gomphosphenia minima sp. nov. (Cymbellales, Rhoicospheniaceae)
FIGURES 2–19. LM micrographs. 2–7. Gomphosphenia minima C. Delgado, S. Blanco, L. González-Paz & S.F.P. Almeida sp. nov. 8–15. Planothidium lanceolatum. 16–19. Planothidium frequentissimum. Scale bar = 10 µm.
FIGURE 1 in A new species of an unexplored diatom genus: Gomphosphenia minima sp. nov. (Cymbellales, Rhoicospheniaceae)
FIGURE 1. Map of Portugal with the municipality of Coimbra highlighted in grey. Location of the study stream (grey circle) in Candal stream, Lousã Mountain, Central Portugal.
FIGURES 17–24 in New species of the genus Encyonema (Cymbellales, Bacillariophyta) from the Descoberto River Basin, Central-western Brazil
FIGURES 17–24. Encyonema candangense sp. nov. 17–21. Valve view, LM. 22, 23. External valve view, SEM. 24. Broken frustule, showing external and internal valve surfaces and the arrangement of alveolae of the hypovalve. Scale bars: Figs 17–21 = 10 μm; Figs 22, 23 = 2 μm; Figs 24 = 1μm.
FIGURES 2–16 in New species of the genus Encyonema (Cymbellales, Bacillariophyta) from the Descoberto River Basin, Central-western Brazil
FIGURES 2–16. Encyonema menezesiae sp. nov. 2–8. Valve view, LM. 9–12. External valve view, SEM. 13, 14. Ends in external valvar view, SEM, showing hooked external terminal fissure of the raphe. 15, 16. Internal valvar view in SEM. Scale bars: Figs 2–8 = 10 μm; Figs 9–12, 15, 16 = 2 μm; Figs 13, 14 = 1μm.
FIGURES 24–29 in Encyonema bonapartei sp. nov.: a new freshwater diatom species (Cymbellales, Bacillariophyceae) in canals of Great East region (France)
FIGURES 24–29. Encyonema bonapartei SEM views (type material from Sampigny). 24. Valve in external view. 25. Valve in internal view. 26. Close up on proximal raphe endings in external view. 27. Close-up of proximal raphe endings in internal view. 28. Close-up of apex in external view. 29. Close-up of apex in internal view showing distal raphe fissure ending in helictoglossae. Scale bars = 2 μm.
FIGURE 1 in Encyonema bonapartei sp. nov.: a new freshwater diatom species (Cymbellales, Bacillariophyceae) in canals of Great East region (France)
FIGURE 1. Sampling sites (black triangle) in Great East region (France) where Encyonema bonapartei has been recorded, with the location of type locality (black star).
FIGURES 54–63 in Three new species of Cymbellales (Bacillariophyceae) from Réunion Island
FIGURES 54–63. Encyonopsis palmeti LM. Scale bar: 10 µm. Valve views of the holotype population from Ravine de l'Etang à Grand Etang showing variation in size.
FIGURES 68–72 in Three new species of Cymbellales (Bacillariophyceae) from Réunion Island
FIGURES 68–72. Encyonopsis palmeti SEM. Scale bars: 1 µm (Figs 68, 69 and 71), 100 nm (Figs 70 and 72).
FIGURES 47–51 in Three new species of Cymbellales (Bacillariophyceae) from Réunion Island
FIGURES 47–51. Encyonopsis cilaosensis SEM. Scale bars: 1 µm (Figs 47, 48 and 51), 100 nm (Figs 49 and 50).
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