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6 results for “Scoliotropidaceae”
FIGURES 27–29 in External ultrastructure of Progonoia diatreta sp. nov. (Bacillariophyta, Scoliotropidaceae) differs from P. musca and P. intercedens comb. nov.
FIGURES 27–29. Progonoia diatreta, sp. nov., internal SEM. 27. General view of valve. 28. Detail of apex showing terminal raphe ending and internal aspect of alveoli, with partial transverse walls and a series of small pores around the inner edge of one, the outer edge of the other, and the apical end of the last alveolus (arrow). Some of the pores of the external surface can be seen where the inner membrane has broken away (arrowhead). 29. Detail of central area showing the double helictoglossa (arrow) and the partial transverse walls extending into each alveolus from the longitudinal wall (arrowhead). Scale bars: Fig. 27 = 10 μm, Figs 28, 29 = 2 μm.
FIGURES 7–13 in External ultrastructure of Progonoia diatreta sp. nov. (Bacillariophyta, Scoliotropidaceae) differs from P. musca and P. intercedens comb. nov.
FIGURES 7–13. Progonoia intercedens, LM (Figs 7–10 DIC) and external SEM (Figs 11–13). 7, 8. Oblique frustule at two focal planes. 9. Valve. 10. Frustule in girdle view, showing the striae on the copulae. 11. Valve, external view. 12. Detail of areolae showing contrasting structure of longitudinal rows: a hymen near the surface in the middle rows (arrowhead), probably unbroken in life, and the deeper pits of the inner and marginal areolae (arrows). Notice also the small pores with structure similar to the middle rows. 13. Detail of marginal areolae, showing the deeper membranes with small marginal perforations (arrow). Scale bars: Figs 7–10 = 10 μm, Fig. 11 = 5 μm, Figs 12, 13 = 1 μm.
FIGURES 4–6 in External ultrastructure of Progonoia diatreta sp. nov. (Bacillariophyta, Scoliotropidaceae) differs from P. musca and P. intercedens comb. nov.
FIGURES 4–6. Comparison of stria detail in differential interference contrast illumination, focus on the outer surfaces of the valves. 4. Authentic Navicula musca from BM 1557 (detail of 3); arrow indicates the large pores. 5. Progonoia intercedens from Guam; arrow indicates the large pores in the striae and arrowhead the rib separating the two alveoli. 6. Progonoia diatreta from Guam (detail of holotype); arrow indicates the rings of small pores around the edges of the alveoli, and arrowhead the wide, sculpted rib between the two alveoli. Scale bars = 2 μm.
FIGURES 18–26 in External ultrastructure of Progonoia diatreta sp. nov. (Bacillariophyta, Scoliotropidaceae) differs from P. musca and P. intercedens comb. nov.
FIGURES 18–26. Progonoia diatreta, sp. nov., LM (Figs 18–20) and external SEM (Figs 21–26). 18. Stacked image (DIC) of holotype frustule. 19, 20. Valve at two focal planes, brightfield. 21, 22. Two valves in SEM, showing size and shape variation. 23, 24. Details of a frustule in a whole-mount preparation. 23. Half of a frustule showing deflection of terminal raphe ending and porate copulae. 24. Detail of central portion of valve showing central raphe endings, excavated areas between the two alveoli (arrow) and adjacent to raphe branches, and external pore patterns of the alveolae, including a curved slit at the inner edge of the inner alveolus and a large round pore at the outer end of the marginal alveolus. 25, 26. Details of longer frustule in 22 showing valve and copula features, including row of puncta in the middle of the areolae as well as around the edges. Scale bars: Figs 18–22 = 10 μm, Figs 23, 25, 26 = 5 μm, Fig. 24 = 2 μm.
FIGURES 1–3. Navicula musca. 1 in External ultrastructure of Progonoia diatreta sp. nov. (Bacillariophyta, Scoliotropidaceae) differs from P. musca and P. intercedens comb. nov.
FIGURES 1–3. Navicula musca. 1. Greville's drawing in Gregory 1857. Photo from an original copy courtesy of Friedel Hinz. 2. Drawing from Schmidt's Atlas, pl. 160, fig. 10, captioned 'N. musca Greg. "typus!"' Photo by C. Lobban from the reprinted edition. 3. Specimen from BM 1557 marked by Greville as being N. musca (DIC). Scale bar on C = 10 μm.
FIGURES 14–17. Progonoia intercedens, internal SEM. 14–16 in External ultrastructure of Progonoia diatreta sp. nov. (Bacillariophyta, Scoliotropidaceae) differs from P. musca and P. intercedens comb. nov.
FIGURES 14–17. Progonoia intercedens, internal SEM. 14–16. View of entire valve with inner membranes intact, and two details. 14. Valve, showing internal ridge (arrow) (the band covering part of the valve is not from this species). 15. Detail of internal aspect of alveoli, showing the series of small pores around the inner edge of one and the outer edge of the other (arrows); also showing striae on the valvocopula. 16. Detail of central area showing double helictoglossa (arrow) and the offset in the central areolae (arrowhead). 17. Eroded cell with internal alveolar membranes missing, showing the rib between the two alveoli, also showing the porate copulae. Scale bars: Fig. 14 = 10 μm, Figs 15, 16 = 1 μm, Fig. 17 = 5 μm.
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