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84 results for “Gomphonema”
FIGURES 28–31. Gomphonema bicepiformis, SEM. Internal view. 28 in Gomphonema bicepiformis sp. nov., a new diatom species (Bacillariophyta) from a stream in Zhejiang, China
FIGURES 28–31. Gomphonema bicepiformis, SEM. Internal view. 28. Whole valves, showing pseudosepta at both ends and helictoglossae. 29. Central portion of the valve showing deflected central raphe endings, and internal opening of the stigma. 30. Interior view of the headpole showing the small helictoglossa. 31. Internal view of footpole showing the helictoglossa, pseudoseptum and raphe slit. Scale bars = 10 μm(Fig. 28), 2 μm(Figs 29–31).
FIGURES 1–14 in Gomphonema bicepiformis sp. nov., a new diatom species (Bacillariophyta) from a stream in Zhejiang, China
FIGURES 1–14. Light microscopy of Gomphonema bicepiformis W. Zhang & Kociolek, valve views showing the size diminution series. Scale bar = 10 μm.
FIGURES 20–27. Gomphonema bicepiformis, SEM. External view. 20–21 in Gomphonema bicepiformis sp. nov., a new diatom species (Bacillariophyta) from a stream in Zhejiang, China
FIGURES 20–27. Gomphonema bicepiformis, SEM. External view. 20–21. External view of the capitate headpole with the external distal raphe end curving onto the valve mantle. Striae uniseriate, mostly composed of slit-like, "C-" shaped or triangular areolae, occasionally biseriate. 22–24. External view of the central portion of the valve showing wide axial area with circular and irregular depressions, smallll and rectangular stigma, small marginal ridge separating the valve face from the mantle. 25. External view of the valve face between the central portion and footpole showing irregular depressions and biseriate striae. 26–27. External view of the capitate footpole with the deflected distal end of raphe, rounded porelli and irregular shaped depressions at valve terminus. Scale bars = 2 μm.
FIGURES 15–19. Gomphonema bicepiformis W in Gomphonema bicepiformis sp. nov., a new diatom species (Bacillariophyta) from a stream in Zhejiang, China
FIGURES 15–19. Gomphonema bicepiformis W. Zhang & Kociolek, SEM. Exterior view of a whole valve, showing the valve variability of the holotype, slightly undulate raphe with rounded proximal ends, gibbous central portion, round, capitate foot pole and headpole. Scale bars = 10 μm.
FIGURES 1–6 in Gomphonema wuyiensis sp. nov., a new freshwater species (Bacillariophyceae) from Wuyi Mountains, China
FIGURES 1–6. Gomphonema wuyiensis, LM, DIC. 1–6. Valve views, showing the size range of the holotype population. Scale bar = 10 μm.
FIGURES 14–19. Gomphonema wuyiensis, SEM. Internal views. Fig. 14–15 in Gomphonema wuyiensis sp. nov., a new freshwater species (Bacillariophyceae) from Wuyi Mountains, China
FIGURES 14–19. Gomphonema wuyiensis, SEM. Internal views. Fig. 14–15. Internal view of a whole valve, showing central nodule. Figs 16, 18. Headpole showing helictoglossa at the raphe terminus. Fig. 17. Central area with internally-projecting central nodule bearing slit-like stigmal opening and recurved proximal raphe ends. Fig 19. Footpole showing a small helictoglossa at the raphe terminus. Scale bars = 10 μm (Figs 14–15), 2 μm (Figs 16–19).
FIGURES 7–13. Gomphonema wuyiensis, SEM. External views. Fig. 7 in Gomphonema wuyiensis sp. nov., a new freshwater species (Bacillariophyceae) from Wuyi Mountains, China
FIGURES 7–13. Gomphonema wuyiensis, SEM. External views. Fig. 7. External view of a whole valve. Figs 8,11. Headpole showing external distal raphe end extending onto the mantle. Fig. 9. Central area show stigma opening differentiated from the areolae. Central area is narrowly rectangular in shape. Fig. 10, 13. Footpole, with bilobed apical pore field restricted to the mantle, comprised of different-sized porelli that are physically removed and differentiated from areolae. Figs 12. Note the C-shaped or round openings of the areolae. Scale bars = 10 μm (Fig. 7), 2 μm (Figs 8, 9), 1 μm (Figs 10–12), 0.5 μm (Fig. 13)
FIGURES 34–55 in New diatom species from the Gomphonema subtile group in Southeast Asia
FIGURES 34–55: Gomphonema dalatica Glushchenko, Kulikovskiy & Kociolek sp. nov. LM. Size diminution series, valve views. Figure 39 is of the holotype. Scale bar = 10 μm.
FIGURES 64–75 in New diatom species from the Gomphonema subtile group in Southeast Asia
FIGURES 64–75: Gomphonema prowsei Glushchenko, Kulikovskiy & Kociolek sp. nov. LM. Size diminution series, valve views. Figure 66 is of the holotype.
FIGURES 1–25 in New diatom species from the Gomphonema subtile group in Southeast Asia
FIGURES 1–25: Gomphonema pantropicum Reichardt. LM. Size diminution series, valve views. Scale bar = 10 μm.
FIGURES 56–63 in New diatom species from the Gomphonema subtile group in Southeast Asia
FIGURES 56–63: Gomphonema dalatica Glushchenko, Kulikovskiy & Kociolek sp. nov. SEM. Figs 56, 58, 60, 62 are external views; 57, 59, 61, 63 are internal views. Fig. 56. Whole valve illustrating valve shape. Fig. 57. Whole valve, showing small pseudoseptum at each pole. Fig. 58. Valve center with slightly dilated proximal raphe ends, small, round stigma opening and areolae occluded by flaps that create C-shaped openings. Fig. 59. Valve center with small central nodule bearing recurved proximal raphe ends and slit-like stigmal opening. Striae are in troughs, with thickened rims around each areola. Fig. 60. Headpole, with the hooked-shaped distal raphe end curving onto the valve mantle. C-shaped areolar openings are evident. Fig. 61. Headpole, showing prominent helictoglossa and pseudoseptum. Fig. 62. Footpole, with round porelli positioned mostly on the valve mantle, physically separated, and morphologically distinct from the areolae. Fig. 63. Footpole, with large helictoglossa and pseudoseptum evident. Porelli are occluded internally. Small siliceous projections can be seen around the areolae. Scale bars = 5 μm (Figs 56, 57); 1 μm (Figs 58–60, 62); 0.5 μm (Figs 61, 63).
FIGURES 26–33 in New diatom species from the Gomphonema subtile group in Southeast Asia
FIGURES 26–33: Gomphonema pantropicum Reichardt. SEM. Figs 26, 28, 30, 32 are external views; 27, 29, 31, 33 are internal views. Fig. 26. Whole valve illustrating valve shape, with characteristic headpole and footpole. Fig. 27. Whole valve, showing small pseudoseptum at each pole, and prominent central nodule. Fig. 28. Valve center with slightly dilated proximal raphe ends, small, round stigma opening and areolae occluded by flaps. Fig. 29. Valve center with undulate central nodule bearing bent proximal raphe ends and ovoid stigma opening. The striae occur in trough-like structures. Fig. 30. Headpole, with the hooked-shaped distal raphe end curving onto the valve mantle. Occluded areolae are evident. Fig. 31. Headpole, showing prominent helictoglossa and pseudoseptum. Fig. 32. Footpole, with round porelli physically separated and morphologically distinct from the areolae. Fig. 33. Footpole, with large helictoglossa and pseudoseptum evident. Scale bars = 5 μm (Figs 26, 27); 1 μm (Figs 28–33).
FIGURES 76–83 in New diatom species from the Gomphonema subtile group in Southeast Asia
FIGURES 76–83: Gomphonema prowsei Glushchenko, Kulikovskiy & Kociolek sp. nov. SEM. Figs 76, 78, 80, 82 are external views; 77, 79, 81, 83 are internal views. Fig. 76. Whole valve illustrating valve shape, with characteristic headpole and footpole. Fig. 77. Whole valve with distinctly punctate striae evident. Fig. 78. Headpole, with the hooked-shaped distal raphe end curving onto the valve mantle. C- and E-shaped areolar openings are evident. Fig. 79. Headpole, showing prominent helictoglossa, septum and pseudoseptum. Helictoglossa is offset to one side. Fig. 80. Valve center with slightly dilated proximal raphe ends, round stigma opening and areolae occluded by flaps that create C- or irregularly-shaped openings. Fig. 81. Valve center with small central nodule bearing recurved proximal raphe ends and slit-like stigma opening. Striae are in troughs, with thickened rims around each areola. Fig. 82. Footpole, with round porelli positioned mostly on the valve mantle, physically separated, and morphologically distinct from the areolae. Fig. 83. Footpole, with large helictoglossa and pseudoseptum evident. Porelli are occluded internally. Small siliceous projections can be seen around the areolae. Scale bars = 10 μm
FIGURES 28–33 in Two multi-stigmate Gomphonema species of Africa: Gomphonema kalahariense (nom. nov., stat. nov.) and Gomphonema chemeron (sp. nov.)
FIGURES 28–33. SEM images of Gomphonema chemeron. Figs. 28, 29. External views. Fig. 28. Girdle view at the apex with uniseriate rows of areolae comprising striae evident. Fig. 29. Valve view of central area with numerous (4) stigmata present. Figs 30-33. Internal views. Fig. 30. Entire valve view. Central nodule has 5 stigmata openings and recurved proximal raphe ends. Fig. 31. Central area to headpole, with central nodule bearing 3 stigmata openings and recurved proximal raphe ends. At the headpole, both a septum and pseudoseptum are present. Fig. 32. Footpole with prominent pseudoseptum evident, covering the helictoglossa. Fig. 33. Entire valve, with central nodule bearing 4 stigmata openings and proximal raphe ends barely visible. Striae can be seen extending onto the mantle. A remnant pseudoseptum is present at the headpole. Scale bars are indicated in the images.
FIGURE 19. Biplot data from 25 in Two multi-stigmate Gomphonema species of Africa: Gomphonema kalahariense (nom. nov., stat. nov.) and Gomphonema chemeron (sp. nov.)
FIGURE 19. Biplot data from 25-point landmark analysis showing morphologically-distinct populations of Gomphonema species at Baringo Basin and Kalahari Basin sites.
FIGURE 2 in Two multi-stigmate Gomphonema species of Africa: Gomphonema kalahariense (nom. nov., stat. nov.) and Gomphonema chemeron (sp. nov.)
FIGURE 2. Map of Africa with site locations for Mababe Basin (circle) in Botswana and Baringo Basin (square) in Kenya.
FIGURES 12–17 in Two multi-stigmate Gomphonema species of Africa: Gomphonema kalahariense (nom. nov., stat. nov.) and Gomphonema chemeron (sp. nov.)
FIGURES 12–17. SEM images of Gomphonema kalahariense. Fig. 12. External valve view. "S" indicates position of stigmata. Fig. 13. Internal valve view. "S" indicates position of stigmta and "PS" indicates evident pseudoseptum. Figs 14, 15. External views. Fig. 14. Headpole. Fig. 15. Footpole. "APF" indicates position of apical pore field. Figs 16, 17. Internal views. Fig. 16. Footpole, showing the pseudoseptum. "H" indicates the helictoglossa. Fig. 17. Headpole, with both pseudoseptum and helictoglossa evident. Scale bars are indicated in the images.
FIGURES 19–29. Gomphonema frequentiformis comb. nov. SEM. Fig. 19. External valve outline overview. Sinuous raphe and heteropolar valves. Fig. 20. Internal valve. Fig. 21 in Gomphonema frequentiformis (Metzeltin & Krammer) comb. nov. (Bacillariophyta): ecology and taxonomy of a Neotropical diatom
FIGURES 19–29. Gomphonema frequentiformis comb. nov. SEM. Fig. 19. External valve outline overview. Sinuous raphe and heteropolar valves. Fig. 20. Internal valve. Fig. 21. Detail of central area showing rounded isolated pore ('stigma') and sigmoid slit-like areolae. Striae not interrupted in the valve face-mantle junction. Proximal raphe endings rounded. Figs 22–23. Internal detail of central area showing transversely elongated isolated pore located in a long groove. Strongly hook-shaped proximal raphe ending. Areolar openings are large and round without internal occlusions, located in а deep foraminal row between strongly silicified vimines. Figs 24–27. Detail of apical (24, 25) and footpoles (26, 27) showing the presence of apical pore field on both apices. Raphe slightly curved to the same side. Figs 28–29. Internal detail of both apices showing the helictoglossae and the slit-like internal areolae openings. Note the pseudoseptum present at both apices (a silica plate extending internally from the apical portion of the valve). Scale bars = 10 µm (Figs 19, 20), 4 µm (Fig. 21), 3 µm (Figs 24–27), 2 µm (Figs 22, 23, 28, 29).
FIGURES 30–36. Fig. 30 in Gomphonema frequentiformis (Metzeltin & Krammer) comb. nov. (Bacillariophyta): ecology and taxonomy of a Neotropical diatom
FIGURES 30–36. Fig. 30. Reproduction of Gomphonema angustatum var. productum Grunow in Van Heurck (1880, pl. 24, figs 52– 55). Figs 31–36. LM and SEM of Gomphonema productum (Grunow) Lange-Bertalot & E.Reichardt (= G. angustatum var. productum ('producta') from Van Heurck) Type n° 217 showing apical pore field on both apices, sinuous raphe system and partly biseriate striae formed by round small C-like areolae. Biseriate pattern is present near the axial area. Scale bars = 10 µm.
FIGURES 37–40 in Gomphonema frequentiformis (Metzeltin & Krammer) comb. nov. (Bacillariophyta): ecology and taxonomy of a Neotropical diatom
FIGURES 37–40. Common Gomphonema species from the Rio Negro basin (BrazilianAmazon). Figs 37–38. Gomphonema frequentiformis showing external valve overview and detail of the central area with slit-like areolae and apical pore field conspicuous on the footpole. Figs 39–40. Gomphonema archaevibrio showing slight heteropolarity and dorsiventrality. Detail of the central area showing sigmoid slit-like areolae as well. Scale bars = 30 µm (Fig. 39), 10 µm (Fig. 37), 5 µm (Figs 38, 40).
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