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8 results for “Psammodiscus”
FIGURES 32–36 in Morphology and taxonomy of Psammodiscus Round & Mann (Bacillariophyceae: Rhaphoneidales) with a description of the new species Psammodiscus calceatus
FIGURES 32–36. Psammodicus calceatus sp. nov., areolae structure. Figs 32–34. External views. Fig. 32. Areola (A), rotae (R) with two broken spokes (S) total = 5. Fig. 33. Rotae broken (spokes appear to = 7). Fig. 34. Areola without rota, showing ring structure (Ri). Note knob-like projections are traces of spokes (S, as a 'tree stump'). Fig. 35. Internal view of areola (A) and rota (R), with fin-like projections (F; rather than spokes). Fig. 36. Internal view of areola fracture (A), spoke (S) connecting to rota between fin-like projections (F). Note spokes located behind ring structure (Ri) and fin-like projections. Scale bars = 0.5 µm.
FIGURES 23–31 in Morphology and taxonomy of Psammodiscus Round & Mann (Bacillariophyceae: Rhaphoneidales) with a description of the new species Psammodiscus calceatus
FIGURES 23–31. Psammodicus calceatus sp. nov. (SEM). Fig. 23. External view of theca; square (a) enlarged view in fig. 24; square (b) enlarged view in fig. 25. Fig. 24. Valve face and mantle, areolae (A) occluded by plated rotae (R) with 3–10 spokes (S). Note areolae elongate with small number of spokes at the mantle. Fig. 25. External opening of rimoportula (Ri). Fig. 26. External view of theca, square enlarged view in fig. 27. Fig. 27. Valve lacking small pore and rimoportulae. Fig. 28. Internal valve view, arrowhead indicating rimoportula (Ri). Fig. 29. Internal opening of rimoportula (Ri), areolae (A) occluded by plated rotae (R), spokes not seen in internal views. Fig. 30. Areolae (A) occluded by plated rotae (R) on valve face and mantle. Fig. 31. Lips of rimoportula (Ri). Scale bars = 10 µm (Figs 23, 26, 28), 1 µm (Figs 24, 27, 30), 0.5 µm (Figs 25, 31).
FIGURES 5 in Morphology and taxonomy of Psammodiscus Round & Mann (Bacillariophyceae: Rhaphoneidales) with a description of the new species Psammodiscus calceatus
FIGURES 5. Psammodiscus nitidus (CLSM). Each row (A, B, C) taken at valve surface, shallow and deep focuses, respectively. Note numerous discoid plastids. Column I, DIC; Column II, autofluorescence of plastids; Column III, DAPI stained nucleic acid. P = plastid; N = nucleus. Scale bar = 10 µm.
FIGURES 52 in Morphology and taxonomy of Psammodiscus Round & Mann (Bacillariophyceae: Rhaphoneidales) with a description of the new species Psammodiscus calceatus
FIGURES 52. Schematic drawing of epitheca of Psammodiscus calceatus. A, areola; EV, epivalve; Ri, rimoportula; 2B, second band; 3B, third band; 4B, fourth band; L2B, ligula of 2B; L3B, ligula of 3B; L4B, ligula of 4B; Pores, P; VC, valvocopula; arrowheads, openings of bands.
FIGURES 1–4 in Morphology and taxonomy of Psammodiscus Round & Mann (Bacillariophyceae: Rhaphoneidales) with a description of the new species Psammodiscus calceatus
FIGURES 1–4. Psammodiscus nitidus (LM). Figs 1a, b: Solitary cells attached to sand grains, living cells from TW153 (BF), solitary attached cells (two circles in fig. 1b) to a sand grain (figs 2a and b are the same image at different focal depths). Figs 2–4. Valves (BF): Fig. 2 from TW166, figs 3 and 4 from TW159. Scale bars = 50 µm (Fig. 2), 10 µm (Figs 3–5).
FIGURES 6–18 in Morphology and taxonomy of Psammodiscus Round & Mann (Bacillariophyceae: Rhaphoneidales) with a description of the new species Psammodiscus calceatus
FIGURES 6–18. Psammodiscus nitidus (SEM). Fig. 6. Complete frustule, view of hypovalve (HV), square is enlarged view in fig. 7. Fig. 7. Valve face, external openings of rimoportula (Ri) and small pore (SP), note small pore located near valve centre. Fig. 8. Mantle, areolae (A) occluded by plated rotae (R) with 2–3 spokes (S). Fig. 9. External view of large valve, note valves in figs 9 and 12 generated from the same cell; rectangle (a) is enlarged view in fig. 10; rectangle (b) is enlarged view in fig. 11. Fig. 10. External openings of small pore (SP) and rimoportula (Ri). Fig. 11. External view of fractured valve; areolae (A) occluded by plated rotae (R) with 3 spokes (S). Fig. 12. Internal view of large valve, rectangle (a) is enlarged view in fig. 13; rectangle (b) is enlarged view in fig. 14. Fig. 13. First rimoportula (Ri1), note rimoportula located near margin. Fig. 14. Second rimoportula (Ri2) and small pore (SP), note both rimoportula and small pore are located near the margin. Fig. 15. Complete frustule, note small pore (SP) located near centre of hypovalve (HV); no rimoportula; square (a) is enlarged view in fig 16; square (b) is enlarged view in fig 18. Fig. 16. Valvocopula (VC) opening (OVC) occluded by ligula (L2B) of second band (2B); epivalve (EV). Fig. 17a. Opposite view from fig. 16; hypovalve (HV), valvocopula (VC) opening (OVC), ligula (L2B) of second band (2B), third band (3B). Fig.17b. Schematic drawing of fig. 17a; Pores (P), note pores of second band are circular holes, pores of third band are triangle. Fig. 18. Second band (2B) opening (O2B); valvocopula (VC) and third band (3B). Note third band either in formation or is eroded. Scale bars = 10 µm (Figs 9, 12, 15), 5 µm (Fig. 6), 1 µm (Figs 7, 8, 10, 11, 16– 18), 0.5 µm (Figs 13, 14).
FIGURES 19–22 in Morphology and taxonomy of Psammodiscus Round & Mann (Bacillariophyceae: Rhaphoneidales) with a description of the new species Psammodiscus calceatus
FIGURES 19–22. Psammodicus calceatus sp. nov. (LM. BF); Fig. 20 = holotype. Scale bar = 10 µm.
FIGURES 37–51 in Morphology and taxonomy of Psammodiscus Round & Mann (Bacillariophyceae: Rhaphoneidales) with a description of the new species Psammodiscus calceatus
FIGURES 37–51. Psammodicus calceatus sp. nov., epicingulum.
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