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7 results for “Pleurosigmataceae”
FIGURES 7–18 in New Arcuatasigma species (Bacillariophyta, Pleurosigmataceae) from Guam and Belize, and the taxonomic identities of Toxonidea challengeriensis and its variety
FIGURES 7–18. Arcuatasigma arenicolum Lobban, sp. nov. Figs 7–12 DIC, Figs 14–18 SEM. Figs 7, 8. Live cell in valve and girdle view, showing plastids. Fig. 9. Holotype. Fig. 10. Another cell; arrowhead indicates position of twist in the frustule. Fig. 11. Detail of central part of cell in valve view. Fig. 12. Detail of apex in girdle view. Fig. 13. Portion of frustule showing exterior and interior of valve and the non-rotated apex. Fig. 14. Detail of central area showing overlapping raphe pores. Fig. 15. Detail of valve surface showing smooth surface and V-shaped openings of paired areolae (arrows). Fig. 16. Apex of frustule. Fig. 17. Detail of internal central area. Fig. 18. Internal aspect of apex showing helictoglossa. Scale bars: 10 μm (Figs 7–13), 2 μm (Figs 16–18), 500 nm (Figs 14, 15).
FIGURES 1–6 in New Arcuatasigma species (Bacillariophyta, Pleurosigmataceae) from Guam and Belize, and the taxonomic identities of Toxonidea challengeriensis and its variety
FIGURES 1–6. Arcuatasigma marginale Lobban, sp. nov. Figs 1, 2. Holotype in LM (differential interference contrast). Fig. 3. Twisted pole in SEM. The raphe on the valve face can be seen rolling around to the lower side, while the valve surface at the apex has rolled up from below. Fig. 4. Central portion of valve and valvocopula, oriented with poles curved to left (inset). Showing the non-overlapping raphe branches, areolae in the proximal rows joined apically (arrowheads) vs. those in the distal rows joined transapically (arrows). Also showing the longitudinal striae parallel to the sternum on the left, slightly angled on the right. Fig. 5. Detail of valve showing areola slit orientation trends in different rows (double-headed arrows) and joined areolae in the marginal rows (arrows). Fig. 6. Detail of frustule at apex. Scale bars: 10 μm (Figs 1–3), 2 μm Figs 4, 6), 1 μm (Fig. 5).
FIGURES 16–23 in Typification and taxonomy of Gyrosigma tenuissimum (W. Sm.) J.W. Griffith & Henfr., comparison with Gyrosigma coelophilum N. Okamoto & Nagumo and description of two new taxa: Gyrosigma tenuissimum var. gundulae var. nov. and Gyrosigma baculum sp. nov. (Pleurosigmataceae, Bacillariophyta)
FIGURES 16–23. Gyrosigma tenuissimum, additional populations, SEM images. Fig. 16. general view, internal. Bar = 20 µm. Fig. 17. Apex, internal. Bar = 4 µm. Fig. 18. centre, internal. Bar = 4µm. Fig. 19. apex, internal. Bar = 4 µm. Fig. 20. general view, external. Bar = 20 µm. Fig. 21. apex, external. Arrow marks apical pore. Bar = 3 µm. Fig. 22. centre, external. Bar = 3 µm. Inset: detail (2x enlargement) showing raphe fissure ends. Fig. 23. apex, external. Arrow marks apical pore. Bar = 3 µm.
FIGURES 11–15 in Typification and taxonomy of Gyrosigma tenuissimum (W. Sm.) J.W. Griffith & Henfr., comparison with Gyrosigma coelophilum N. Okamoto & Nagumo and description of two new taxa: Gyrosigma tenuissimum var. gundulae var. nov. and Gyrosigma baculum sp. nov. (Pleurosigmataceae, Bacillariophyta)
FIGURES 11–15. Gyrosigma tenuissimum, additional populations, LM images. Fig. 11. Specimen from BRM ZU8/73, Sicily. Stitch of 3 stacks of 9, 6, and 9 images respectively. Bar = 10 µm. Fig. 12. Another specimen from BRM ZU 8/73, stitch of 2 stacks of 6 and 7 images respectively. Bar = 10 µm. Fig. 13. LM specimen from BRM ZU 8/35, Sardinia. Stitch of 3 stacks of 14, 12 and 9 images respectively. Bar = 20 µm. Inset: detail of striation, bar = 2 µm. Fig. 14. LM of another specimen from BRM ZU 8/35, Sardinia. Stitch of 2 stacks of 17 and 16 images respectively. Bar = 20 µm. Fig. 15. LM of specimen from Hvar, Adriatic Sea. Stitch of 3 stacks of 14, 10 and 12 images respectively. Bar = 20 µm.
FIGURES 28–36. Gyrosigma tenuissimum var. gundulae, type material. Figures 28, 30, 31 in Typification and taxonomy of Gyrosigma tenuissimum (W. Sm.) J.W. Griffith & Henfr., comparison with Gyrosigma coelophilum N. Okamoto & Nagumo and description of two new taxa: Gyrosigma tenuissimum var. gundulae var. nov. and Gyrosigma baculum sp. nov. (Pleurosigmataceae, Bacillariophyta)
FIGURES 28–36. Gyrosigma tenuissimum var. gundulae, type material. Figures 28, 30, 31. LM images. Fig. 28. Holotype, general view. Stitch of 5 stacks of 15–20 images each. Bar = 30 µm. Fig. 30. Enlargement showing centre, note resolution of vestigial (upper) and continuous (lower) central bars. Bar = 1 µm. Fig. 31. Apex showing irregular striation. Bar = 3 µm. Figures 29, 32–36. SEM images. Fig.29. General view. Bar = 30 µm. Fig. 32. Apex, external view. Arrow indicates small accessory pore. Bar = 3 µm. Fig. 33. Centre, external view. Bar = 3 µm. Inset: 1.5x enlargement of Fig. 33 showing overlapping central raphe fissures. Fig. 34. Apex, internal view. Bar = 3 µm. Fig 35. Centre, internal view. Note sideways twisting of raphe fissures. Bar = 3 µm. Inset: 1.5x enlargement showing vestigial central bars. Fig. 36. Vestigial central bars of another specimen. Bar = 1.5 µm.
Supplementary material 2 from: Du F-C, Li Y-H, Xu K-D (2023) Morphology and molecular phylogeny of Pleurosigma pacificum sp. nov. (Pleurosigmataceae), a new tropical pelagic species from the Western Pacific Ocean. PhytoKeys 227: 99-108. https://doi.org/10.3897/phytokeys.227.103890
Maximum parsimony (MP) phylogenetic trees based on the concatenated SSU rDNA and rbcL gene sequences
Supplementary material 1 from: Du F-C, Li Y-H, Xu K-D (2023) Morphology and molecular phylogeny of Pleurosigma pacificum sp. nov. (Pleurosigmataceae), a new tropical pelagic species from the Western Pacific Ocean. PhytoKeys 227: 99-108. https://doi.org/10.3897/phytokeys.227.103890
GenBank accession of SSU rDNA and rbcL gene sequences
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