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8 results for “Stephanodiscus”
FIGURES 24–30 in Stephanodiscus Ehr. species from Holocene sediments in the Faiyum Depression (Middle Egypt)
FIGURES 24–30. Stephanodiscus galileensis, LM. Fig. 25. External convex valve note irregular spines and sub-marginal silica ring. Fig. 25. Internal convex valve with rimoportula arrowed. Fig. 26. Detail of same valve showing central area ring of fultoportulae with two or three satellite pores. Fig. 27. External concave valve with ring of spines and raised interfascicular ribs. Fig. 28. Internal concave valve showing ring of sub-marginal fultoportulae and rimoportulae (arrowed). Fig. 29. Similar showing detail of a rimoportula, a submarginal fultoportula with two satellite pores and marginal fultoportulae. Fig. 30. Detail of a sub-marginal fultoportula with three satellite pores and surrounding domed cribra. Scale bars = 10 µm (Figs 24, 25, 27, 28), 1 µm (Figs 26, 29), and 0.5 µm (Fig. 30).
FIGURES 15–18. Stephanodiscus neoaegypticus v. fekrii, SEM. Fig. 15. External valve with a convex central area. Fig. 16 in Stephanodiscus Ehr. species from Holocene sediments in the Faiyum Depression (Middle Egypt)
FIGURES 15–18. Stephanodiscus neoaegypticus v. fekrii, SEM. Fig. 15. External valve with a convex central area. Fig. 16. Internal valve showing two rimoportulae (arrowed). Fig. 17. Detail of internal marginal zone showing fultoportulae with either three or four satellite pores. Fig. 18. Internal central area fultoportula with two satellite pores. Scale bars = 2 µm (Fig. 15), 5 µm (Fig. 16), and 1 µm (Figs 17, 18).
FIGURE 31 in Stephanodiscus Ehr. species from Holocene sediments in the Faiyum Depression (Middle Egypt)
FIGURE 31. Size distributions for diatom valve diameters (see text). Fig. 31a: Stephanodiscus neoaegypticus sensu lato from material at 430 cm depth in core GARK1. Fig. 31b. Stephanodiscus galileensis Hakansson & Ehrlich from material at 1930 cm depth in core QARU9.
FIGURES 19–23 in Stephanodiscus Ehr. species from Holocene sediments in the Faiyum Depression (Middle Egypt)
FIGURES 19–23. Stephanodiscus galileensis, LM. Fig. 19. Convex valve showing a distinct sub-marginal hyaline ring in focus. Fig. 20. Similar showing marginal ring of spines and valve central area in focus. Fig. 21. Concave valve showing finer fascicle structure (see S. galileensis morphotype B, Hakansson & Locker 1987) and valve face fultoportulae (arrowed). Fig. 22. Similar showing valve central area in focus. Fig. 23. Similar, but valve is more strongly silicified. Scale bars = 5 µm (Figs 19–23).
FIGURES 3–8 in Stephanodiscus Ehr. species from Holocene sediments in the Faiyum Depression (Middle Egypt)
FIGURES 3–8. Stephanodiscus neoaegypticus, LM. Fig. 3. Valve showing an indistinct sub-marginal hyaline ring and broad interfascicular ribs. Fig. 4. Valve focused to show the valve face-mantle zone with occasional bifurcating interfascicular ribs (arrowed). Fig. 5. A strongly silicified valve. Fig. 6. A part dissolved valve with eroded margin and diminished interfascicular ribs. Figs 7–8. S. neoaegypticus v. fekrii LM. Fig. 7. Whole valve focused to show the broad interfascicular ribs and marginal bifurcations (arrowed). Fig. 8. The same whole valve (Fig. 7) focused to show the central area. Scale bars = 5 µm (Figs 3–8)
FIGURE 2 in Stephanodiscus Ehr. species from Holocene sediments in the Faiyum Depression (Middle Egypt)
FIGURE 2. Gross sediment stratigraphies of the three cores, QARU9, QARU10 and GARK1 (see text for sediment descriptions). Note the basal sands below finely laminated diatom marl sediment in QARU9 & 10.
FIGURES 9–14. Stephanodiscus neoaegypticus, SEM. Fig. 9. Iconotype, external valve showing small concentric convex undulation with out spines. Fig. 10 in Stephanodiscus Ehr. species from Holocene sediments in the Faiyum Depression (Middle Egypt)
FIGURES 9–14. Stephanodiscus neoaegypticus, SEM. Fig. 9. Iconotype, external valve showing small concentric convex undulation with out spines. Fig. 10. External valve showing small concentric concave undulation and external rimoportula opening (arrowed). Fig. 11. Internal valve showing sub-marginal rimoportulae (arrowed). Fig. 12. Detail of the same valve showing two sub-marginal rimoportulae and marginal ring fultoportulae. Fig. 13. Detail of the central ring of fultoportulae (each with two satellite pores). Stephanodiscus neoaegypticus v. fekrii SEM. Fig. 14. Iconotype, external valve with a concave central area, marginal ring of fultoportula apertures and external opening of a rimoportula (arrowed). Scale bars = 10 µm (Figs 9–11, 14), 1 µm (Fig. 12), and 2 µm (Fig. 13).
FIGURE 1 in Stephanodiscus Ehr. species from Holocene sediments in the Faiyum Depression (Middle Egypt)
FIGURE 1. Lake Qarun situated in northern part of the Faiyum Depression, Egypt. Three terrestrial sediment core locations are shown with QARU9 and 10 on the southern shore of the lake and GARK1 in the Gharak region of south west Faiyum. Note diatomite exposures are indicated to the west and northeast of the modern lake.
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