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117 results for “Achnanthidium”
FIGURES 145–152 in Morphological variability within the Achnanthidium minutissimum species complex (Bacillariophyta): comparison between the type material of Achnanthes minutissima and related taxa, and new freshwater Achnanthidium species from Portugal
FIGURES 145–152. SEM micrographs with details of the type material of Achnanthes minutissima Kütz. (isotype material, Kützing's Algarum Aquae Dulcis Germanicarum, Decade VIII, no. 75, Kützing 301). 145. Apice of a rapheless valve in girdle view, with the slit-like areolae in the mantle. 146. Apice of a rapheless valve in external view, with the rounded areolae in the apice and transapically elongated areolae in the valve margin. 147. Central area of a rapheless valve in external view. 148. Central area of a rapheless valve in internal view, with the areolae covered by hymenes. 149. Central area of a raphe valve in external view, showing the straight proximal raphe pores. 150. Central area of a raphe valve in a tilted internal view, with the proximal raphe pores slightly deflected in opposite directions. 151. Apice of a raphe valve in external view, with the distal ending slightly deflected. 152. Apice of a rapheless valve in internal view, with the areolae covered by hymenes. Scale bars = 1 μm.
FIGURES 27–32 in Achnanthidium petuniabuktianum sp. nov. (Achnanthidiaceae, Bacillariophyta), a new representative of the A. pyrenaicum group from Spitsbergen (Svalbard Archipelago, High Arctic)
FIGURES 27–32. Achnanthidium petuniabuktianum sp. nov. Light and scanning electron micrographs. All pictures taken from the type population (BR-4177). 27–28. SEM external views of an entire rapheless valve. 29. SEM internal view of an entire rapheless valve. 30. SEM detail of an external rapheless valve. 31. SEM detail of an internal rapheless valve. 32. SEM view showing a frustule in girdle view. Scale bars always 10 μm, except Figs 30–31 where scale bar is 1 μm.
FIGURES 2–26 in Achnanthidium petuniabuktianum sp. nov. (Achnanthidiaceae, Bacillariophyta), a new representative of the A. pyrenaicum group from Spitsbergen (Svalbard Archipelago, High Arctic)
FIGURES 2–26. Achnanthidium petuniabuktianum sp. nov. Light and scanning electron micrographs. All pictures taken from the type population (BR-4177). 1. LM view of a frustule in girdle view. 3–11. LM views of raphe valves. 12–19. LM views of rapheless valves. 20–22. SEM external views of an entire raphe valve. 23. SEM detail of the distal raphe ending of a raphe valve. 24. SEM detail of the internal raphe valve. 25–26. SEM internal views of an entire raphe valve. Scale bars always 10 μm, except Figs 23–24 where scale bar is 1 μm and Fig. 25 where scale bar is 5 μm.
FIGURES 34–41 in Achnanthidium sinense sp. nov. (Bacillariophyta) from the Wuling Mountains Area, China
FIGURES 34–41. Achnanthidium sinense, sp. nov., SEM. 34–41. External views of middle part of raphe valve, note the stria variation around the central area. 38–41. External views of middle part of rapheless valve, note the stria variation around the central area. Scale bars = 5 μm.
FIGURES 30–33 in Achnanthidium sinense sp. nov. (Bacillariophyta) from the Wuling Mountains Area, China
FIGURES 30–33. Achnanthidium sinense, sp. nov., SEM. 30. External view of rapheless valve, note the slightly radiate striae throughout the valve. 31. Internal view of rapheless valve, note the slightly radiate striae throughout the valve. 32–33. Girdle views. 32. Proliferating cells, note the notches on the mantles. 33. A frustule with convex rapheless valve discernible. Scale bars = 10 μm.
FIGURES 2–21 in Achnanthidium sinense sp. nov. (Bacillariophyta) from the Wuling Mountains Area, China
FIGURES 2–21. Achnanthidium sinense, sp. nov., LM. 2–11. Ten raphe valves showing size reduction, note the lanceolate valve outline and distinct proximal raphe ends. 12–20. Nine rapheless valves showing size reduction, note the lanceolate valve outline. 2 and 12. Photographs of isotype specimens. 11 and 14. Photographs of holotype specimens. 21. Girdle view, note the shallow v-shaped outline. Scale bar (in Fig. 2) = 10 μm for all figures.
FIGURES 22–29 in Achnanthidium sinense sp. nov. (Bacillariophyta) from the Wuling Mountains Area, China
FIGURES 22–29. Achnanthidium sinense, sp. nov., raphe valves, SEM. 22. External view of raphe valve, note the narrow lanceolate axial area. 23. Internal view of raphe valve, note the narrow lanceolate axial area. 24–26. Details of Fig. 22, note the hooked terminal raphe fissures and parallel or slightly convergent striae at the apices. 27–29. Details of Fig. 23, note the parallel or slightly convergent striae at the apices, and curved proximal raphe endings. Scale bars = 5 μm.
FIGURES 82–88 in Achnanthidium neotropicum sp. nov., a new freshwater diatom from Lake Apastepeque in El Salvador (Central America)
FIGURES 82–88. Achnanthidium neotropicum sp. nov., SEM. 82–85. External view of raphe valve showing the linear to weakly lanceolate axial area and the central area with rectangular fascia (Figs 82, 83) or shortened, more widely spaced striae (Fig. 85). 86. Internal view of a raphe valve showing the oppositely defected proximal raphe endings and helictoglossae. 87, 88. Frustules in girdle view with slit-like areolae on the mantle.
FIGURES 2–70 in Achnanthidium neotropicum sp. nov., a new freshwater diatom from Lake Apastepeque in El Salvador (Central America)
FIGURES 2–70. Achnanthidium neotropicum sp. nov., LM. 2–32. Rapheless valve. 33–35. Frustules in girdle view. 36–70. Raphe valve.
FIGURES 89–99 in Achnanthidium neotropicum sp. nov., a new freshwater diatom from Lake Apastepeque in El Salvador (Central America)
FIGURES 89–99. Original material of Achnanthidium lineare from the Van Heurck Collection in Meise (SEM). 89–94. Rapheless valve. 95–99. Raphe valve.
FIGURES 71–81 in Achnanthidium neotropicum sp. nov., a new freshwater diatom from Lake Apastepeque in El Salvador (Central America)
FIGURES 71–81. Achnanthidium neotropicum sp. nov., SEM. 71–76. External view of rapheless valve. 77–81. Internal view of rapheless valve. 81. Internal detail of central part of a rapheless valve showing the occluded areolae.
FIGURES 1–21 in Achnanthidium palmeti (Bacillariophyta, Achnanthidiaceae), a new freshwater species from Réunion Island
FIGURES 1–21. LM. Scale bar: 10 µm. 1–14, Grand Etang site in Ravine de l'Etang. 15–21, Marsouins river at Bébour site.
FIGURES 330 in Taxonomy and ecology of Achnanthidium (Bacillariophyta, Achnanthidiaceae) from southeastern Brazil with the description of six new species
FIGURES 330. Schematic representation of the main morphological differences (arrows) in the valve outlines and their distribution along the PCA axes.
FIGURES 329 in Taxonomy and ecology of Achnanthidium (Bacillariophyta, Achnanthidiaceae) from southeastern Brazil with the description of six new species
FIGURES 329. Stacked outlines showing the shape variation of valve outline accessing the superimposed images and the range of shapes as reflected in PC1 and PC2s (A. acutum sp. nov.: 18 valves; A. brasiliense sp. nov.: 20 valves; A. lineare: 20 valves; A. minutissimum: 13 valves.
FIGURES 328 in Taxonomy and ecology of Achnanthidium (Bacillariophyta, Achnanthidiaceae) from southeastern Brazil with the description of six new species
FIGURES 328. PCA of EFDs for valve outlines of A. acutum sp. nov. type material (red), A. lineare type material (blue), A. brasiliense sp. nov. type material (purple) and A. minutissimum type material (green).
FIGURES 317–327 in Taxonomy and ecology of Achnanthidium (Bacillariophyta, Achnanthidiaceae) from southeastern Brazil with the description of six new species
FIGURES 317–327. LM images of Achnanthidium sp. from Serraria reservoir, São Paulo state (SP-469204). 317–321. LM views of raphe valves. 322–327. LM views of the rapheless valves. Scale bar = 10 μm.
FIGURES 311–316 in Taxonomy and ecology of Achnanthidium (Bacillariophyta, Achnanthidiaceae) from southeastern Brazil with the description of six new species
FIGURES 311–316. SEM images of Achnanthidium vandevijveri sp. nov. from the type (SP-469485) from Garças Lake, São Paulo state. 311–313. SEM external view of raphe valves showing the range of areolae number per stria. 314–316. SEM external view of the rapheless valves. SEM scale bars indicated in each figure.
FIGURES 215–237 in Taxonomy and ecology of Achnanthidium (Bacillariophyta, Achnanthidiaceae) from southeastern Brazil with the description of six new species
FIGURES 215–237. LM and SEM images of Achnanthidium saprophilum from Rio Grande reservoir, São Paulo state (SP427898). 215–222. LM views of raphe valves. 223–231. LM views of rapheless valves. 232–234. SEM external view of raphe valves showing striation pattern, axial and central areas. 235. SEM internal view of the raphe valve. 236. SEM external view of the rapheless valve showing striation pattern, axial and central areas. 237. SEM internal view of the rapheless valve. LM scale bar = 10 μm. SEM scale bars indicated in each figure.
FIGURES 276–310 in Taxonomy and ecology of Achnanthidium (Bacillariophyta, Achnanthidiaceae) from southeastern Brazil with the description of six new species
FIGURES 276–310. LM and SEM images of Achnanthidium vandevijveri sp. nov. from the type (SP-469485) from Garças Lake, São Paulo state. Figure 282 corresponds to the holotype. 276–291. LM views of raphe valves. 292–306. LM views of rapheless valves. 307, 308. SEM external view of raphe and rapheless valve showing striation pattern, axial and central areas. 309. SEM internal view of the raphe valve. 310. SEM internal view of the rapheless valve. LM scale bar = 10 μm. SEM scale bars indicated in each figure.
FIGURES 117–143 in Taxonomy and ecology of Achnanthidium (Bacillariophyta, Achnanthidiaceae) from southeastern Brazil with the description of six new species
FIGURES 117–143. LM and SEM images of Achnanthidium paulistanum sp. nov. from the type (SP-255724) from a small lake, São Pedro city, São Paulo state. Figure 118 corresponds to the holotype. 117–126. LM views of raphe valves. 127–134. LM views of rapheless valves. 135–137. Girdle views of the new taxon. 138–140. SEM external view of raphe valves showing striation pattern, axial and central areas, the terminal raphe fissures deflected and the row of slit-like areolae on mantle. 141. SEM internal view of the raphe and rapheless valves. 142, 143. SEM external view of the rapheless valves showing striation pattern, axial and central areas. LM scale bar = 10 μm. SEM scale bars indicated in each figure.
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