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28 results for “Planothidium”
FIGURES 20–31 in Taxonomy, distribution and autecology of Planothidium bagualensis sp. nov. (Bacillariophyta) a common monoraphid species from southern Brazilian rivers
FIGURES 20–31: Planothidium bagualensis SEM views. Fig. 20. External view of rapheless valve. Fig. 21. Internal view of rapheless valve with prominent cavum. Fig. 22. External view of raphe valve. Fig. 23. Internal view of raphe valve. Fig. 24. External detail of central area showing expanded and ligulated proximal raphe endings. Reduced striae forming a rounded wide central area. Striae composed (usually) 3–4 rows of small areolae. Fig. 25. Internal detail of raphe valve showing proximal raphe ends. Fig. 26. External detail of valve extremity of rapheless valve. Striae usually triseriate, interrupted at valve mantle junction. Groups of 4–6 areolae present on mantle at end of each striae. Figs 27–28. Detail of cavum aperture. Note the extremities of the border attached to neighbour striae. Figs 29–30. Terminal raphe ending. Note the higher number of areoale in the raphe valve with striae composed of rows with 4–5 round poroids, irregularly placed toward the ends. Areolae very scarce in valve mantle. Fig. 31. Internal view of rapheless valve areaolae. Scale bars: Figs 20–23, 26 = 5 µm; Figs 24–25, 28–30 = 3 µm; Figs 27 = 2 µm; Fig. 31 = 1 µm.
FIGURES 2–19 in Taxonomy, distribution and autecology of Planothidium bagualensis sp. nov. (Bacillariophyta) a common monoraphid species from southern Brazilian rivers
FIGURES 2–19: Planothidium bagualensis LM views. Figs 2–19. Valve views. Figs 2–10. Rapheless valves. Figs 11–19. Raphe valves. Rio Pardinho hydrographical basin, Rio Grande do Sul, Brazil. BR-4315. Fig. 4. Rapheless valve of designated holotype, BR- 4316. Scale bar represents 10 µm.
FIGURE 1 in Taxonomy, distribution and autecology of Planothidium bagualensis sp. nov. (Bacillariophyta) a common monoraphid species from southern Brazilian rivers
FIGURE 1: (A) Confirmed presence of Planothidium bagualensis in southern Brazil according to published and illustrated literature (see Table 1 for details). 1 = Lange-Bertalot & Krammer (1989); 2 = Rodrigues & Moreira Filho (1990); 3 = Krammer & Lange- Bertalot (1991); 4 = Ludwig & Flores (1995); 5 = Burliga et al. (2005); 6 = Ludwig & Bigunas (2006); 7 = Ferrari & Ludwig (2007); 8 = Leandrini et al. (2010); 9 = Bes et al. (2012); 10 = Fontana & Bicudo (2012); 11 = Bartozek et al. (2013). (B) Rio Pardo hydrographical basin in the State of Rio Grande do Sul (RS), Brazil, with location of sampling sites in the Rio Pardinho (S1-S6) and Rio Pardo sub-basins (S7 and S9) sampled during the years 2001–2004 (n=129).
FIGURE 32 in Taxonomy, distribution and autecology of Planothidium bagualensis sp. nov. (Bacillariophyta) a common monoraphid species from southern Brazilian rivers
FIGURE 32: Boxplot of relative abundance (%) of Planothidium bagualensis in the Rio Pardo hydrographical basin, RS, Brazil and relationships between phosphates (PO 3−; mg L−1), chemical oxygen demand (COD; mg L−1), total dissolved solids (TDS; mg L−1) and 4 pH. Percentages based in counting of at least 600 valves per sample (n=129). Dashed lines indicate weighted average optima.
FIGURES 12–20 in Planothidium lagerheimii comb. nov. (Bacillariophyta, Achnanthales) a forgotten diatom from South America
FIGURES 12–20. SEM images of Planothidium lagerheimii comb. nov. Fig. 12. External view of rapheless valve. Fig. 13. Internal view of raphe valve. Fig. 14. External view of raphe valve. Fig. 15. Internal view of rapheless valve. Fig. 16. Detail of well-developed helictoglossa. Fig. 17. Detail of rapheless valve showing conspicuous grooves and multiseriate striae. Fig. 18. Internal detail of thick silicified virgae of rapheless valve. Fig. 19. Internal detail of uniseriate striae of raphe valve. Fig. 20. Internal detail of rapheless valve showing a well-developed cavum.
FIGURES 1–11. Planothidium lagerheimii comb. nov. Figs 1–6 in Planothidium lagerheimii comb. nov. (Bacillariophyta, Achnanthales) a forgotten diatom from South America
FIGURES 1–11. Planothidium lagerheimii comb. nov. Figs 1–6: Reproduction of original drawings. Figs 1–2. Cocconeis lagerheimii Cleve (1894b, pl. 3, figs 21–22). Figs 3–4. Cocconeis rudis Frenguelli (1953, pl. 1, figs 11–12). Figs 5–6. Achnanthes salvadoriana Hustedt (1953, fig. 1). Figs 7–11. LM images of Planothidium lagerheimii population from southern Brazil (Rio Grande do Sul, Santa Cruz do Sul, Preto Stream, Rio Pardo hydrographical basin).
FIGURE 1 in Planothidium galaicum sp. nov. (Bacillariophyta, Achnanthidiaceae), a new diatom species from Galician coast, Spain
FIGURE 1. Geographic location of the type locality.
FIGURES 1–35 in Planothidium africanum sp. nov., a new freshwater diatom (Bacillariophyta) species from Tanzania
FIGURES 1–35. Planothidium africanum Van de Vijver, Gogne, Hoogsteyns, Van de Velde, Vlaminck, Kabota, Teunen & C.E.Wetzel, sp. nov. LM and SEM pictures taken from the holotype slide (BR-4778, Brook near Morogoro, Tanzania, sample L10 Stone). Figs 1–14. LM diminution series of the rapheless valve. Figs 15–28. LM diminution series of the raphebearing valve. Fig. 29. SEM external view of an entire rapheless valve. Fig. 30. SEM internal view of an entire rapheless valve. Fig. 31. SEM external view of an entire raphebearing valve. Fig. 32. SEM internal view of an entire raphe-bearing valve. Fig. 33. SEM external detail of the valve apex of a rapheless valve showing the structure of the striae. Note the mantle striae composed of irregular groupings of areolae. Fig. 34. SEM external detail of the girdle. Fig. 35. SEM internal detail of the cavum spanning the neighboring striae. Scale bars represent 10 µm except for Figs 33–35 where scale bar = 1 µm.
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