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Dataset results
7 results for “Bicudoa”
FIGURES 40–54 in Bicudoa amazonica gen. nov. et sp. nov. (Bacillariophyta)-a new freshwater diatom from the Amazon basin with a complete raphe loss in the Eunotioid lineage
FIGURES 40–54. SEM of several eunotioid elements: Figs 40–41 Perforated and opened valvocopula and detail of short internal raphe slit of Eunotia ventriosa var. brevis. Rimoportulae not visible; note the alternating short striae at the dorsal valve mantle and the thick apical cell wall; Fig. 42 Detail of internally uncovered areolae of E. ventriosa var. brevis; Figs 43–45 Bicudoa amazonica: Fig. 43 Detail of external uncovered areolae; Fig. 44 Transversal view of the valve face showing areolae aperture not covered and thick silicified cell wall; Fig. 45 Apex detail of B. amazonica with no external raphe nor apical pore field; Fig. 46 Detail of E. ventriosa var. brevis in oblique external view showing well developed raphe branch and perforated connective bands; Figs 47–54 SEM of different Eunotia species from the Brazilian Amazon showing distinct external and internal evolutionary patterns of raphe system: Fig. 47 Eunotia siolii Hustedt—Holotype (AM 1310). Raphe located mainly on the ventral valve mantle; Fig. 48 Eunotia synedraeformis Hustedt. Prominent "J" shaped raphe with dilated distal and proximal ends; rimoportulae aperture distinct; Fig. 49 Eunotia tapacumopsis Metzeltin & Lange-Bertalot. Large raphe slit located on the valve mantle and valve face; Fig. 50 Eunotia sp. from the Rio Negro with prominent spines and areolae covered externally by velum; Figs 51–52 Eunotia waimiriorum C.E. Wetzel. Reduced raphe system (white arrows) and poorly developed helictoglossae; Fig. 53 Eunotia bidens Ehrenberg. Note internal arrangement of the striae areolae aligned in a narrow "ditch" as in Fragilariforma hamiltonii; Fig. 54 Eunotia sp. showing a well developed helictoglossa. Scale bars: Figs 40–41, 45–47 and 53–54: 5 µm; Figs 42–44: 0.5 µm; Fig. 48: 2 µm; Fig. 49: 3 µm; Figs 50–52: 1 µm..
FIGURES 21–27 in Bicudoa amazonica gen. nov. et sp. nov. (Bacillariophyta)-a new freshwater diatom from the Amazon basin with a complete raphe loss in the Eunotioid lineage
FIGURES 21–27. SEM micrographs of Bicudoa amazonica in external view. Fig. 21 Whole frustule in valvar view showing irregular silica deposition along the central part of the valve; central valve face with somewhat concentrated silica deposition at the apical axis; Fig. 22 Valve face apex detail showing the complete absence of raphe aperture system; small foramina forming the striae; Figs 23–24 Detail of both extremities showing reduced slightly radiate striae; note the absence of apical pore fields and external raphe openings on the mantle; axial area narrow, more or less eccentric; Fig. 25 Apex detail with small wart-like silicate on the valve edges (arrow); Fig. 26 Detail of apical valve outline in oblique view; Fig. 27 Detail of one valve and the cingulum in girdle view showing perforated Eunotia-like open copulae (white arrows) with multiporoid striae. Note the numerous open connective bands. Scale bars: Fig. 21: 10 µm; Figs 22–25: 2 µm; Figs 26–27: 5 µm.
FIGURES 7–20 in Bicudoa amazonica gen. nov. et sp. nov. (Bacillariophyta)-a new freshwater diatom from the Amazon basin with a complete raphe loss in the Eunotioid lineage
FIGURES 7–20. LM micrographs (bright field optics) of Bicudoa amazonica (Figs 7–14). Holotype population from the Rio Negro hydrographical basin, Brazil (SP–400.477). Fig. 7 Large cell showing slight dorsiventrality and irregular pattern of striae; Fig. 8 Holotype specimen; Figs 7–13 Micrographs illustrating size reduction series in the type population; Fig. 14 Two cells in connective view; Figs 15–17 Three Eunotia species similar in size and shape: Fig. 15 Eunotia pileus var. guianense (Ehrenberg) E. Reichardt; Fig. 16 Eunotia coringii Metzeltin & Lange-Bertalot; Fig. 17 Eunotia ventriosa R.M. Patrick. Note the helictoglossae present and visible on all Eunotia species (black arrow); Figs 18–20 Size reduction series of Fragilariforma hamiltonii Metzeltin & Lange-Bertalot. All specimens from the Rio Negro basin. Scale bar: 10 µm.
FIGURE 6 in Bicudoa amazonica gen. nov. et sp. nov. (Bacillariophyta)-a new freshwater diatom from the Amazon basin with a complete raphe loss in the Eunotioid lineage
FIGURE 6. Sampling sites (black dots) located along the Negro River hydrographical basin, the Brazilian Amazon for (a) planktonic samples (n = 119), including tributaries and the main channel. (b) Periphytic samples collected on distinct tributaries (n = 153). Turtle sampling site area highlighted.
FIGURES 33–39 in Bicudoa amazonica gen. nov. et sp. nov. (Bacillariophyta)-a new freshwater diatom from the Amazon basin with a complete raphe loss in the Eunotioid lineage
FIGURES 33–39. Fragilariforma species from Europe (Weierbach basin, Luxembourg, Figs 33–35) and South America (Rio Negro basin, Brazilian Amazon, Figs 36–39). Fig. 33 Valve and cingulum of F. virescens (Ralfs) D.M. Williams & Round showing marginal spines, apical pore fields, rimoportulae opening (white arrow) and connective bands with one row of areolae. Striae uniseriate composed by areolae with simple closing plates; sternum centrally located; Fig. 34 F. virescens in connective view showing mantle margin with siliceous plaques, spines present on valve face/mantle border, having spathulate tips and open girdle bands and Fig. 35 Detail of rimoportula (transapically) located on the valve pole usually aligned with the striae; Figs 36–39 Fragilariforma hamiltonii Metzeltin & Lange-Bertalot; Fig. 36 Detail of apical area showing thickened marginal spines, areola structure and absence of apical pore field; central sternum clearly visible; Fig. 37 Small specimen showing no rimoportulae aperture nor apical pore fields; Figs 38–39 Oblique internal view of F. hamiltonii showing the internal arrangement of the striae with the inner openings of areolae aligned in a narrow "ditch"; apical pore field and rimoportula absent in both species. Scale bars: Figs 33–34: 10 µm; Figs 35–37: 1 µm; Figs 38–39: 3 µm.
FIGURES 1–5 in Bicudoa amazonica gen. nov. et sp. nov. (Bacillariophyta)-a new freshwater diatom from the Amazon basin with a complete raphe loss in the Eunotioid lineage
FIGURES 1–5. SEM. South American representatives of the subclass Eunotiophycideae from freshwater environments: Fig. 1 Eunotia sp. and Fig. 2 Perinotia diamantina F. Ferrari & C.E. Wetzel from the 'Chapada Diamantina' range mountains in northeastern Brazil (Bahia State)—Holotype (Sample SP–391.701), 'Instituto de Botânica', São Paulo, Brazil; Fig. 3 Actinella peronioides Hustedt, from Rio Negro basin, Brazilian Amazon—Sample SP–400.309, 'Instituto de Botânica', São Paulo, Brazil; Fig. 4 Peronia brasiliensis Hustedt from Lake Jurucuí (Pará state), Brazilian Amazon—Paratype. Sample AM1018, Hustedt Collection, Bremerhaven; Fig. 5 Actinella falcifera (Metzeltin & Lange-Bertalot) Metzeltin & Lange-Bertalot (subgenus Cultria Metzeltin & Lange-Bertalot 1998) from Ereri River, Cachimbo Mountains, in southern Pará, Brazilian Amazon—Sample AM1310, Hustedt Collection, Bremerhaven. Scale bars: Figs 1–2: 10 µm; Figs 3–5: 5 µm.
FIGURES 28–32 in Bicudoa amazonica gen. nov. et sp. nov. (Bacillariophyta)-a new freshwater diatom from the Amazon basin with a complete raphe loss in the Eunotioid lineage
FIGURES 28–32. SEM micrographs of Bicudoa amazonica in internal view. Apices details showing the absence of structures typical of Eunotiophycideae (raphe, helictoglossae and rimoportulae). Fig. 28 Valve with vestigial raphe at both extremities (arrows); Fig. 29 Detail of apex with no vestigial raphe; Figs 30–32 Vestigial slit (Figs 30–31) until the complete raphe loss (Fig. 32) in different individuals of the type population. Raphe slits rarely found. Striae interrupted and misaligned near the ventral margin. Scale bars: Figs 28–29: 10 µm; Figs 30–32: 5 µm.
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