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17 results for “Gomphosphenia”
FIG. 6 in Rise of subgen. Rhoicosphenula Lange-Bert. to the genus level, and description of a new Gomphosphenia s.s. species from Puerto Rico
FIG. 6. — SEM micrographs of Gomphosphenia patrickiana Cantonati, Lange-Bert., Kociolek & A.A.Saber, sp. nov.: A, B; close-up views of the internal pole regions of the valve showing relatively large helictoglossae; C-E, wedge-shaped girdle view of the frustules showing details of the valve mantle and cingulum bands; apical pore fields absent. F, G, external, with window due to fracture (F), and internal (G) view of a whole theca + parts of the valvocopula; pseudosepta and septa absent. Scale bars: A, B, 1 μm; C-G, 3 μm.
FIG. 4. — A-U in Rise of subgen. Rhoicosphenula Lange-Bert. to the genus level, and description of a new Gomphosphenia s.s. species from Puerto Rico
FIG. 4. — A-U, Light micrographs of Gomphosphenia patrickiana Cantonati, Lange-Bert., Kociolek & A.A.Saber, sp. nov., depicting the valve size-diminution series and girdle view of the holotype specimens. Scale bar: 10 μm.
FIG. 5 in Rise of subgen. Rhoicosphenula Lange-Bert. to the genus level, and description of a new Gomphosphenia s.s. species from Puerto Rico
FIG. 5. — SEM micrographs of Gomphosphenia patrickiana Cantonati, Lange-Bert., Kociolek & A.A.Saber, sp. nov.: A, B, external views of whole valves showing the striation pattern; central area slightly broader in larger specimens (B); unilateral fascia might be present (A); C, internal view of a whole theca + parts of the valvocopula; pseudosepta and septa absent; D, close-up view on the internal valve mid-section, depicting the slightly elevated central nodule and the T-shaped proximal raphe endings. Scale bars: A-C, 3 μm; D, 1 μm.
FIG. 3 in Rise of subgen. Rhoicosphenula Lange-Bert. to the genus level, and description of a new Gomphosphenia s.s. species from Puerto Rico
FIG. 3. — SEM micrographs of the generitype species (R. paradoxa) of Rhoicosphenula Lange-Bert., Kociolek, A.A.Saber & Cantonati, stat. nov. External views (A, B); internal views (C-H): A, complete frustule (note the slit-like areole on valve face and mantle); B, hypovalve (left) with footpole immersed in the six girdle bands, which appear totally hyaline; they are alternately open and closed at each pole; C, valve with apposed valvocopula and a further copula; D, headpole; the valvocopula forms a septum; the valve pseudoseptum is thus mostly covered, only a triangle remains visible; E, valve footpole with pseudoseptum and open valvocopula (no further copula); F, exposed fracture of the right valve margin: the transapical ribs and the alveoli covered by hymenes become visible; G, exposed fracture at the pseudoseptum; H, the corroded hymenes allow a view of the areolae which are more numerous and differently shaped than the slit-like external foramina. Scale bars: A, C, 2 μm; B, D-H, 1 μm. From Lange-Bertalot (1995) mod.
FIG. 2 in Rise of subgen. Rhoicosphenula Lange-Bert. to the genus level, and description of a new Gomphosphenia s.s. species from Puerto Rico
FIG. 2. — LM micrographs of the generitype species (R. paradoxa) of Rhoicosphenula Lange-Bert., Kociolek, A.A.Saber & Cantonati, stat. nov., depicting the valve size-diminution series in valve (A-F) and girdle view (G-I); G undergoing division process) of the holotype specimens. Note the pseudosepta at the head- and footpole, the proximal raphe pores which are well separated and broadened (A-F) whilst the internal endings are closer to each other (see e.g., bright contours in B). Scale bar: 10 μm. From Lange-Bertalot (1995) mod.
FIG. 1 in Rise of subgen. Rhoicosphenula Lange-Bert. to the genus level, and description of a new Gomphosphenia s.s. species from Puerto Rico
FIG. 1. — Box-and-whisker plots for selected physical and chemical variables for the two study streams.
FIGURES 2–25 in Gomphosphenia vallei (Bacillariophyta), a new diatom species from a stream in the "Réserve Naturelle Nationale de la Vallée de Chaudefour", Massif Central (France)
FIGURES 2–25. LM images of Gomphosphenia vallei. Type population from Pérouse Stream. 2–19: Valve view; 20–25: Girdle view. Scale bar = 5 μm.
FIGURE 1 in Gomphosphenia vallei (Bacillariophyta), a new diatom species from a stream in the "Réserve Naturelle Nationale de la Vallée de Chaudefour", Massif Central (France)
FIGURE 1. Map of the studied stream. a: map of Europe; b: map of France; c: location of the sampling site (star); d: photograph of the sampling site in the Chaudefour Valley taken from the upper part of the cirque; e: photograph of the sampling site in the Chaudefour Valley taken from the access road to the Reserve; f: photograph of the Pérouse Stream taken in July 2021.
FIGURES 26–33 in Gomphosphenia vallei (Bacillariophyta), a new diatom species from a stream in the "Réserve Naturelle Nationale de la Vallée de Chaudefour", Massif Central (France)
FIGURES 26–33. SEM images of Gomphosphenia vallei. Type populationfrom Pérouse Stream.26–30:External view of entire valve showing the raphe structure and the striae.31: Internalview of an entire valve showing the raphe structure and the striae:32–33:Girdle view of the frustule. Scale bar = 5 μm (Figs 29–31), 4 µm (Figs 27, 32), 3 µm (Figs 26, 33) and 2 µm (Fig. 28).
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 43–62 in Gomphosphenia plenkoviciae sp. nov. A new species from Crveno jezero, Croatia
FIGURES 43–62. Gomphosphenia plenkoviciae Gligora Udovič & Žutinić sp. nov. LM and SEM pictures of small-sized specimens. Figs 43–56. Small sized specimens with longer striae. Fig. 57. Girdle view of entire frustule showing the mantle striae composed of series of 2–4 small round areolae. Fig. 58. Frustules in girdle view. Mantle striae are composed of a single areola. Figs 59, 60. External view of the whole valve. Fig. 61. Internal view of the whole valve. Fig. 62. Detailed view of the mid-valve showing the occluded striae and proximal raphe endings. LM scale bar = 10 μm. SEM scale bar in Figs 57, 59–61 = 5 μm in Figs 58, 62 = 2 μm.
FIGURES 37–42 in Gomphosphenia plenkoviciae sp. nov. A new species from Crveno jezero, Croatia
FIGURES 37–42. Gomphosphenia plenkoviciae Gligora Udovič & Žutinić sp. nov. SEM pictures of large and medium sized specimens. Figs 37, 39, 40. External view of the whole valve. Fig. 38. Girdle view showing the mantle striae and perforated girdle bands. Fig. 41. Internal valve view. Fig. 42. Detailed view of the mid-valve showing the occluded striae and proximal raphe endings. Scale bar in Figs 37–41 = 10 μm, in Fig. 42 = 2 μm.
FIGURES 2–36 in Gomphosphenia plenkoviciae sp. nov. A new species from Crveno jezero, Croatia
FIGURES 2–36. Gomphosphenia plenkoviciae Gligora Udovič & Žutinić sp. nov. LM pictures of large and medium sized specimens. Valve views showing size diminution series. Scale bar = 10 μm.
FIGURES 27–41 in A new species of an unexplored diatom genus: Gomphosphenia minima sp. nov. (Cymbellales, Rhoicospheniaceae)
FIGURES 27–41. LM micrographs. 27–30. Eunotia minor. 31–41. Sellaphora nigri. Scale bar = 10 µm.
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