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6 results for “Petroplacus”
FIGURES 23–32. Petroplacus tectum from type material. 23–25 in Petroplacus gen. nov. (Bacillariophyta): a new genus of diatom from Lake Baikal
FIGURES 23–32. Petroplacus tectum from type material. 23–25. LM views showing variation of valve size. Figure 23 is the holotype. 26–32. SEM Petroplacus tectum from type material. 26, 28, 29. SEM external views of entire valve showing raphe and striae structure. 26. SEM external view showing the constriction in the centre of the valve (arrow). 28. SEM external detail of proximal raphe endings, expanded into T-shaped grooves, uniseriate striae. 29. SEM external detail of terminal fissure, uniseriate striae. 27, 30−32. SEM internal views of entire valve showing raphe and striae structure. 27. SEM internal view showing the constriction in the centre of the valve (arrow). 30. SEM internal detail of valve centre with proximal raphe endings, volate occlusions of pores. 31. SEM internal detail of valve apex with helictoglossa. 32. SEM internal view showing intercalary striae, round pores occluded by volae. Scale bars = 10 μm (Figs 23–27), 5 μm (Figs 28−31), 1 μm (Fig. 32).
FIGURES 13–22. Scanning electron micrographs. Petroplacus lizae from type material. 13−16 in Petroplacus gen. nov. (Bacillariophyta): a new genus of diatom from Lake Baikal
FIGURES 13–22. Scanning electron micrographs. Petroplacus lizae from type material. 13−16. SEM external views of entire valve showing raphe and striae structure. 14. SEM external detail of valve centre with proximal raphe endings expanded into T-shaped grooves, uniseriate striae. 15, 16. SEM external detail of valve apex with terminal fissures. 19–22. SEM views of entire valve showing raphe and striae structure. 20. SEM internal detail of valve centre with proximal raphe endings, volate occlusions of the areolae. 21. SEM internal detail of valve apex with helictoglossa, round pores occluded by volae. 22. SEM internal detail of broken valve showing the pores apertures. 17. SEM detail of girdle band with a single row of pores. 18. SEM detail of two girdle bands. Scale bars = 10 μm (Figs 13, 19), 3 μm (Figs 14, 20, 21), 5 μm (Figs 17–18), 2 μm (Fig.22), 1 μm (Figs 15–16).
FIGURES 1–12. Light micrographs. 1−12 in Petroplacus gen. nov. (Bacillariophyta): a new genus of diatom from Lake Baikal
FIGURES 1–12. Light micrographs. 1−12. Petroplacus lizae. LM views showing variations in size and valve outline. Fig. 1 is the holotype. Scale bar = 10 μm.
FIGURES 23–26. Petroplacus pantocsekii, SEM. 23, 24 in Notes on the genus Petroplacus (Bacillariophyceae) with new nomenclature transfer
FIGURES 23–26. Petroplacus pantocsekii, SEM. 23, 24. Details of internal valve view showing thickened raphe sternum. 24. Distal raphe ending with elongated helictoglossa (arrow). 25, 26. Internal striae arrangement in intact (25) and corroded (26) specimens showing moniliform 'flaps' coalesced together and sunk into the shallowed canals between virgae.
FIGURES 1–15 in Notes on the genus Petroplacus (Bacillariophyceae) with new nomenclature transfer
FIGURES 1–15. Petroplacus pantocsekii, LM. 1–6, 8–15. Specimens from Rybinsk reservoir showing the size diminution series. 7. The figure designated as lectotype depicting specimen from original material, Lake Onega, phot. by Wislouch and Kolbe (1916).
FIGURES 16–22. Petroplacus pantocsekii, SEM. 16 in Notes on the genus Petroplacus (Bacillariophyceae) with new nomenclature transfer
FIGURES 16–22. Petroplacus pantocsekii, SEM. 16. External valve view showing raphe branches with expanded central pores and straight terminal fissures unilaterally deflected (arrows). 17. Internal valve view showing thickened raphe sternum and central area. 18. Detail of external view of the valve center showing transversely elongated central area, proximal raphe endings with expanded central pores, and radial pattern of uniseriate striae; intercalary stria is visible (arrow). 19. Internal valve view showing thickened central nodule, straight proximal raphe endings (black arrows) connected by longitudinal depression (white arrow). 20–22. External proximal raphe endings lying in spatulate grooves and accompanied by lips-like structure.
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