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30 results for “Mastogloia”
FIGURES 45–52 in Comparison of two new species of Mastogloia (Bacillariophyceae) with other small members of section Ellipticae
FIGURES 45–52. Mastogloia stellae, SEM, (45–50; DISVAR-ANS9SP31). (45) External view of valve showing sinuous raphe branches and irregular quincunx stria pattern; (46) External view of central region showing proximal raphe endings and sunken rounded areolae; (47) External view of apex showing distal raphe ending with no terminal fissure; (48) Internal valve view showing bilobed partecta (arrowhead) up to the apex; (49) Internal view of central region showing raised central nodule; (50) Internal view of apex showing helictoglossa and partecta with linear rows of fine pores. (51, 52) SEM, type material, (DISVAR-ANSH15SP31). (51) External view of tilted frustule showing partectal pores; (52) External view of valve margin showing sunken rounded areolae, with none present on mantle.
FIGURES 15–20 in Comparison of two new species of Mastogloia (Bacillariophyceae) with other small members of section Ellipticae
FIGURES 15–20. Mastogloia crucicula var. alternans, SEM (DISVAR-ANS3SP4A, Siladen, Indonesia). (15) External view of valve showing straight raphe branches and thin fascia; (16) External view of valve center showing proximal raphe endings and areolae with crescentic edges; (17) Internal view of valve center showing areolae and proximal raphe endings; (18) Internal valve view showing two bilobed partecta (arrowhead) in opposite quadrant; (19) External view of tilted specimen showing one partectal pore; (20) Internal view of tilted valve showing raised raphe-sternum and one partectal pore.
FIGURES 37–44 in Comparison of two new species of Mastogloia (Bacillariophyceae) with other small members of section Ellipticae
FIGURES 37–44. Mastogloia matthaei, SEM, type material (SEM stub DISVAR-ANS7SP46, Siladen, Indonesia). (37) External view of valve showing sinuous raphe branches and thickened longitudinal stria pattern (arrowhead); (38) External view of central region showing proximal raphe endings and quadrangular areolae; (39) External view of apex showing distal raphe ending with no terminal fissure; (40) Internal valve view showing bilobed partecta (arrowhead) up to the apex and longitudinal stria pattern; (41) Internal view of central region showing raised central nodule; (42) Internal view of valve showing partecta with linear rows of fine pores; (43) External view of tilted valve showing longitudinal stria pattern with no areolae on mantle; (44) External view of tilted valve showing partectal pores.
FIGURES 65, 66 in Comparison of two new species of Mastogloia (Bacillariophyceae) with other small members of section Ellipticae
FIGURES 65, 66. Mastogloia emarginata, LM, lectotype specimen from Hustedt collection' slide Zt2/65 (finder 433.5), Miang Besar, Borneo. (65) Valve showing four bilobed partecta on each side of the margin. (66) Valve showing finely transapically elongated areolate striae.
FIGURES 29–36 in Comparison of two new species of Mastogloia (Bacillariophyceae) with other small members of section Ellipticae
FIGURES 29–36. Mastogloia ovulum, SEM (DISVAR-ANS4SP32, Siladen, Indonesia). (29) External view of valve showing sinuous raphe branches; (30) External view of central region showing proximal raphe endings and apically elongated areolae; (31) External view of apex showing distal raphe ending with no terminal fissure; (32) Internal valve view showing bilobed partecta (arrowhead) up to the apex; (33) Internal view of central region showing raised central nodule; (34) Internal view of apex showing partecta with linear rows of fine pores; (35) External view of tilted specimen showing quincunx pattern of striae and no areolae on mantle (arrowhead); (36) External view of tilted valve showing partectal pores.
FIGURES 9–14 in Comparison of two new species of Mastogloia (Bacillariophyceae) with other small members of section Ellipticae
FIGURES 9–14. Mastogloia crucicula, SEM (DISVAR-ANS7SP4, Siladen, Indonesia). (9) External view of valve showing straight raphe branches and thin fascia; (10) External view of apex showing distal raphe ending with no terminal fissure; (11) Internal view of valve showing bilobed partectum ornamented with linear rows of fine pores; (12) Internal valve view showing one bilobed partectum (arrowhead) in each valve quadrant; (13) Internal view of tilted valve showing partectal pore (arrowhead); (14) External view of tilted valve showing areolae protected by siliceous vela with crescentic edges.
FIGURES 14–21 in Mastogloia jahniae sp. nov., a new diatom (Bacillariophyceae) from the Baltic Sea coast of Sweden
FIGURES 14–21. SEM micrographs of Mastogloia jahniae sp. nov. Fig. 14. External view of the valve showing sinuous raphe branches and central area (arrowhead). Fig. 15. External view of the central area showing the elongated areolae around the central area. Fig. 16. External view of apex with hyaline area and hooked terminal raphe fissure. Fig. 17. Internal valve view showing partectal ring, siliceous ribs and partectal ducts (arrowhead). Fig. 18. Internal view showing central nodule. Fig. 19. Internal view of apex showing cleft and lacuna. Fig. 20. Partectal ring showing ornamentations and crater-like pore (arrowhead). Fig. 21. Internal view of apex showing septum. Scale bars in Figs 14–17, 5 µm, Figs 18, 20, 1 µm, Figs 19, 21, 2 µm.
FIGURES 22–25 in Mastogloia jahniae sp. nov., a new diatom (Bacillariophyceae) from the Baltic Sea coast of Sweden
FIGURES 22–25. SEM micrographs of Mastogloia jahniae sp. nov. Fig. 22. Tilted view of the external valve side showing girdle band (arrowhead). Fig. 23. Areolae structure and arrangement. Fig. 24. Internal valve side showing central nodule, raphe branches, siliceous ribs, septa and silicified costa-like interstriae. Fig. 25. Internal valve side showing silicified costa-like virgae and areola on the valve internal surface. Scale bars in Figs 22, 24, 5 µm, Figs 23, 25, 1 µm.
Figs 6–11 in Morphology of two Mastogloia species (Bacillariophyta) from Lac de Guiers (Senegal) and comparison with the type material of M. braunii
Figs 6–11. Mastogloia braunii Grunow. Scanning electron micrographs (SEM) of valves from the type population (Grunow 23583 – capsule 0645, Vienna, Austria). 6. SEM external view of an entire valve showing the shallow depressions in the axial area, the undulating external raphe branches and the terminal raphe fissures. 7. SEM external detail of the central area. The arrows indicate one row of irregularly scattered rounded pseudoloculi. 8. SEM internal detail of the central area. 9. SEM detail of the valve mantle showing the mantle striae with near the mantle edge, their typical biseriate character. 10. SEM internal view of the striae with the arrangement of the inner areolae. 11. SEM internal detail of the valve apex with the pseudoseptum. Scale bars: 6–9 = 10 µm; 10–11 = 1 µm.
FIGURES 2–13 in Mastogloia jahniae sp. nov., a new diatom (Bacillariophyceae) from the Baltic Sea coast of Sweden
FIGURES 2–13. Light micrographs of Mastogloia jahniae sp. nov. in different focal planes. Acid cleaned material showing valve shape variant, striations and partectal rings. Scale bar10 µm.
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