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6 results for “Rhoicosphenula”
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.
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