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84 results for “Gomphonema”
FIGURES 274–279. SEM. 274 in The diatom genus Gomphonema Ehrenberg in Lake Baikal. II. Revision of taxa from Gomphonema acuminatum and Gomphonema truncatum-capitatum complexes
FIGURES 274–279. SEM. 274. Gomphonema angusticephalum. External view of footpole, showing deflected distal raphe end bisecting bilobed pore field. Porelli are differentiated from C-shaped areolae. 275–279. Gomphonema laticollum. 275–278. External viws. 279. Internal view. 275, 276. Whole valve views showing outline of the valves. 277. Central area with undulate raphe dilated proximal raphe ends and round stigma opening evident. C-shaped areolae dominate the valve. 278. Headpole showing C-shaped areolae and hooked distal raphe end. 279. Valve view with central nodule, helictoglosae and note presence of pseudosepta. Scale bars = 1 μm in Fig. 274, 2 μm in Figs 277, 278; 5 μm in Figs 275, 276, 279.
FIGURES 228–255 in The diatom genus Gomphonema Ehrenberg in Lake Baikal. II. Revision of taxa from Gomphonema acuminatum and Gomphonema truncatum-capitatum complexes
FIGURES 228–255. LM. 228–236. Gomphonema capitatum. 237–243. Gomphonema microcapitatum sp. nov. Fig. 238 is of the holotype. 244–255. Gomphonema cf. capitatum. Scale bar = 10 μm.
FIGURES 46–87 in The diatom genus Gomphonema Ehrenberg in Lake Baikal. II. Revision of taxa from Gomphonema acuminatum and Gomphonema truncatum-capitatum complexes
FIGURES 46–87. LM. 46–75. Gomphonema pseudacuminatum sp. nov. Fig. 48 is of the holotype. 76–87. Gomphonema sp. Scale bar = 10 μm.
FIGURES 298–301. SEM. 298 in The diatom genus Gomphonema Ehrenberg in Lake Baikal. II. Revision of taxa from Gomphonema acuminatum and Gomphonema truncatum-capitatum complexes
FIGURES 298–301. SEM. 298. Gomphonema capitatum, external view, footpole with apical pore field restricted almost entirely to the valve mantle. Pore field bisected by deflected distal raph end. C–shaped areolae evident. 299–301. Gomphonema cf. capitatum, external views. 299. General valve view. 300. Headpole with distal raphe end deflected onto mantle. Striae with C-shaped areolae continue from valve all around the mantle. 301. Central area. Undulate raphe is distinct. Striae formed of C-shaped areolae. Scale bars = 2 μm in Figs 298, 300, 301; 5 μm in Fig. 299.
FIGURES 292–297. SEM. 292 in The diatom genus Gomphonema Ehrenberg in Lake Baikal. II. Revision of taxa from Gomphonema acuminatum and Gomphonema truncatum-capitatum complexes
FIGURES 292–297. SEM. 292. Gomphonema cf. truncatum. External views. Footpole, with deflected distal raphe end and apical pore field mostly on the valve mantle. Porelli are physically separated from and morphologically differentiated from C-shape areolae. 293. Valve view with undulate raphe and C-shaped areolae distinct. 294. Gomphonema paracapitatum sp. nov., external view. Girdle view showing wedge-shaped frustule and extension of striae from valve view onto mantle. 295–297. Gomphonema capitatum, external views. 295. General valve view. 296. Central area with distinct C-shaped areolae. Proximal raphe ends are dilated weakly. 297. Headpole, Cshaped areolae evident. Scale bars = 1 μm in Fig. 292; 5 μm in Figs 293, 294; 10 μm in Fig. 295; 2 μm in Figs 296, 297.
FIGURES 268–273. Gomphonema angusticephalum, external views. 268, 271. General valve views. 269, 273 in The diatom genus Gomphonema Ehrenberg in Lake Baikal. II. Revision of taxa from Gomphonema acuminatum and Gomphonema truncatum-capitatum complexes
FIGURES 268–273. Gomphonema angusticephalum, external views. 268, 271. General valve views. 269, 273. Central area with dilated proximal raphe ends and small, round stigma opening evident. 270, 272. Headpole, with distal raphe ends hooked onto valve mantle. Areolae appear C-shaped. Sclae bars = 5 μm in Figs 268, 271; 1 μm in Figs 269, 270, 272, 273.
FIGURES 23–30. Gomphonema shanghaiensis, SEM. Internal view. 23–28 in Gomphonema shanghaiensis sp. nov., a new diatom species (Bacillariophyta) from a river in Shanghai, China
FIGURES 23–30. Gomphonema shanghaiensis, SEM. Internal view. 23–28. Internal center. Deflected central raphe endings, internal openings of the stigmata. 29. Interior view of the headpole showing the large helictoglossae and pseudosepta. 30. Internal view of footpole showing the helictoglossae, pseudosepta and raphe slit. Scale bars = 2 μm.
FIGURES 1–8 in Gomphonema shanghaiensis sp. nov., a new diatom species (Bacillariophyta) from a river in Shanghai, China
FIGURES 1–8. Light microscopy of Gomphonema shanghaiensis, valve views showing the size diminution series. Scale bar = 10 μm.
FIGURES 9–14. Gomphonema shanghaiensis W in Gomphonema shanghaiensis sp. nov., a new diatom species (Bacillariophyta) from a river in Shanghai, China
FIGURES 9–14. Gomphonema shanghaiensis W. Zhang & Kociolek, SEM. External and internal views. 9–11. Exterior view of a whole valve, showing the valve variability, straight raphe with rounded proximal ends, gibbous center portion, round foot pole and rostrate to narrow round headpole. 12–14. Interior view of differently shaped whole valves, showing pseudosepta at both ends and offset helictoglossae. Scale bars = 10 μm.
FIGURES 15–22. Gomphonema shanghaiensis, SEM. External view. 15–20 in Gomphonema shanghaiensis sp. nov., a new diatom species (Bacillariophyta) from a river in Shanghai, China
FIGURES 15–22. Gomphonema shanghaiensis, SEM. External view. 15–20. Centre of valve exterior of six different specimens. Slightly expanded and dilated proximal raphe ends, striae composed of "C" shaped or round areolae. 21. External view of the headpole with the external distal raphe end curving onto the valve mantle. 22. Exterior of valve showing the deflected apical end of raphe and rounded porelli. Scale bars = 2 μm (Figs 15–21) and 1μm (Fig. 22).
FIGURES 1–10 in One new Gomphonema (Bacillariophyta) species from Yunnan Province, China
FIGURES 1–10. Gomphonema tumida Liu & Kociolek sp. nov. LM pictures. Valve views showing size diminution series. Figure 3 is of the holotype. Scale bar=10 μm.
FIGURES 18–22 in One new Gomphonema (Bacillariophyta) species from Yunnan Province, China
FIGURES 18–22. Gomphonema tumida Liu & Kociolek sp. nov. SEM pictures, Internal view. Figure 18: The whole valve; Figures 19–20: Central area, showing the internal opening of the stigma and proximal raphe ends; Figure 21: Magnification of part of the valve, showing the internal opening of the areolae; Figure 22: Footpole, showing the helictoglossa, and pseudosepta.
FIGURES 11–17 in One new Gomphonema (Bacillariophyta) species from Yunnan Province, China
FIGURES 11–17. Gomphonema tumida Liu & Kociolek sp. nov. SEM pictures, External view. Figures 11: The whole valve; Figures 12–13: Headpole, showing the terminal fissures, and C-shaped areolae; Figures 14–15: Central area, showing the stigma, and the proximal raphe ends; Figures 16–17: Footpole, showing the terminal fissures and the apical pore field.
FIGURES 17–20. Gomphonema bigutianchnensis. SEM, internal views. Fig. 17 in One new Gomphonema Ehrenberg (Bacillariophyta) species from a high mountain lake in Yunnan Province, China
FIGURES 17–20. Gomphonema bigutianchnensis. SEM, internal views. Fig. 17 Entire valve view showing distinct central nodule and striae. Scale bar = 2 μm. Fig. 18 Headpole with distinct helictoglossa and small pseudoseptum at apex. Scale bar = 1 μm. Fig. 19 Central portion of the valve show central nodule with recurved proximal raphe ends and slit-like stigma opening. Scale bar = 1 μm. Fig. 20 Footpole with prominent helictoglossa and small pseudoseptum at the apex. Structure of the apical pore field is seen just beyond the pseudoseptum. Scale bar = 1 μm.
FIGURES 13–16. Gomphonema bigutianchnensis. SEM, external views. Fig. 13 Entire valve view showing c in One new Gomphonema Ehrenberg (Bacillariophyta) species from a high mountain lake in Yunnan Province, China
FIGURES 13–16. Gomphonema bigutianchnensis. SEM, external views. Fig. 13 Entire valve view showing c-shaped areolae, undulate raphe and round stigma opening. Scale bar = 3 μm. Fig. 14 View of the headpole with distal raphe end curved on the valve mantle and striae continuous around the headpole. Scale bar = 1 μm. Fig. 15 Central portion of the valve showing proximal raphe ends and rounded stigma opening. Scale bar = 1 μm. Fig. 16 Footpole with c-shaped areolae and apical pore field porelli physically separated from areolae and morphologically distinct from the areolae. Scale bar = 1 μm.
FIGURES 1–12 in One new Gomphonema Ehrenberg (Bacillariophyta) species from a high mountain lake in Yunnan Province, China
FIGURES 1–12. Gomphonema bigutianchnensis, Light microscopy, valve views showing size diminution series for the species. Fig. 1 is the holotype. Scale bar = 10 μm for all images.
FIGURE 2–23 in Two new diatom species (Bacillariophyceae) from Brazilian floodplain: Actinella hermes-moreirae sp. nov. and Gomphonema mutunensis sp. nov.
FIGURE 2–23. Actinella hermes-moreirae sp. nov. LM. Valve view from type material. Scale bar = 10 μm.
FIGURES 24–31 in Two new diatom species (Bacillariophyceae) from Brazilian floodplain: Actinella hermes-moreirae sp. nov. and Gomphonema mutunensis sp. nov.
FIGURES 24–31. Actinella hermes-moreirae sp. nov. from type material, Mutum Island, SEM. 24. External view of valve. Scale bar = 5 μm. 25-26. Internal view of the valve. Scale bar = 5 μm. 27. Girdle view of the valve. Scale bar = 5 μm. 28. Aspect of the distal raphe end on headpole. Scale bar = 2 μm. 29-30. Headpole and footpole in internal view showing the rimoportula (arrow) and helictoglossa. Scale bar = 2 μm. 31. 29. Headpole in girdle view, showing the raphe on the mantle (arrow). Scale bar = 2 μm.
FIGURE 52–55 in Two new diatom species (Bacillariophyceae) from Brazilian floodplain: Actinella hermes-moreirae sp. nov. and Gomphonema mutunensis sp. nov.
FIGURE 52–55. Gomphonema mutunensis sp. nov. from type material, Mutum Island, SEM. 52. Girgle view. Scale bar = 10 μm. 53. Aspect of striae and areola shape. Scale bar = 2 μm. 54. Footpole in external view showing the pore field (arrow). 55. Headpole in external view. Scale bar = 1 μm.
FIGURE 48–51 in Two new diatom species (Bacillariophyceae) from Brazilian floodplain: Actinella hermes-moreirae sp. nov. and Gomphonema mutunensis sp. nov.
FIGURE 48–51. Gomphonema mutunensis sp. nov. from type material, Mutum Island, SEM. 48-51. Internal and external view of valve, respectively. Scale bar = 10 μm. 50. Internal view of axial area. 51. External view of axial area showing the central stigma (arrow). Scale bar = 2 μm.
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