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5 results for “Epithemia”
FIGURES 35–40 in A new species of Epithemia Kützing (Bacillariophyceae, Rhopalodiales) from the Mula river, Western Ghats, India, with comments on the phylogenetic position of Rhopalodia and Epithemia
FIGURES 35–40. Epithemia agharkarii sp. nov., SEM from the type material (AHMA #1405), external and internal views. 35, 36. Dorsal frustule showing a regularly sculptured outer surface (Fig. 35, arrows) of the valve with C-type foramina, single row of poroids on the valvocopula and cingulum elements (Fig. 35, asterisks). 37. Ventral view of valve internal with primary (arrows) and secondary fibular costae (arrows), alveolus. 38. Internal view showing the siliceous extensions of the ribs indicated by asterisks. 39. Magnified view of primary fibular costae inside with secondary fibular costae, alveolus (asterisks), C-shaped foramina (arrows), silica processes, and irregularly shaped portula with internal raphe (arrowheads) inside the canal. 40. Broken valve showing the raphe canal (arrows), portula (arrowheads) and stright distal raphe ending. Scale bar = 10 μm (Fig. 35), 2 μm (Fig. 36), 4 μm (Figs 37, 38, 40), 1 μm (Fig. 39).
FIGURES 1–28 in A new species of Epithemia Kützing (Bacillariophyceae, Rhopalodiales) from the Mula river, Western Ghats, India, with comments on the phylogenetic position of Rhopalodia and Epithemia
FIGURES 1–28. Epithemia agharkarii sp. nov., LM (DIC) from the type material (AHMA #1405). 1–28. Valves, focused on the ventral part of the valve face, showing the valve variability of the population. 4–5. Same valve showing fibular costae. 21–26. Frustule focused on the ventral girdle view of the frustule variability of the holotype population. Fig. 20 represents the holotype. Figs 3, 20, and 28. In LM view, arrows showing the raphe, extending from near the ventral margin at the apices to nearly the dorsal margin in the center. 24. In LM view, arrows indicating the terminal thickenings of the transapical costae. Scale bar = 10 μm, Figs 1–20 (Fig. 8) & 21–28 (Fig. 21).
FIGURES 266–272. Figs. 266–272. Epithemia guettingeri. Figs. 266–267. SEM external valve view. Figs. 268–270. SEM internal valve view. Fig. 271 in Diatoms (Bacillariophyta) From Artificial Substrates And Sediments In The Caribbean Sea Off Yucatan, Mexico
FIGURES 266–272. Figs. 266–272. Epithemia guettingeri. Figs. 266–267. SEM external valve view. Figs. 268–270. SEM internal valve view. Fig. 271. LM valve view. Fig. 272. SEM detail of septa. Scale bar = 1μm.
FIGURES 258–265. Fig. 258. Epithemia guettingeri. Fig. 259, 261, 264. Rhopalodia gibberula. Figs. 260, 262–263. R. acuminata. Fig. 265 in Diatoms (Bacillariophyta) From Artificial Substrates And Sediments In The Caribbean Sea Off Yucatan, Mexico
FIGURES 258–265. Fig. 258. Epithemia guettingeri. Fig. 259, 261, 264. Rhopalodia gibberula. Figs. 260, 262–263. R. acuminata. Fig. 265. Hyalosira delicatula var. gibbosa. Scale bar: figs. 258–261, 265 = 1 μm, figs. 262–264 = 10 μm.
FIGURES 29–34 in A new species of Epithemia Kützing (Bacillariophyceae, Rhopalodiales) from the Mula river, Western Ghats, India, with comments on the phylogenetic position of Rhopalodia and Epithemia
FIGURES 29–34. Epithemia agharkarii sp. nov., SEM from the type material (AHMA #1405), external views. 29. External view of the ventral frustule, raphe (arrows) and the girdle bands. 30. Valves are showing the proximal end of the raphe with a small circular opening (arrows) and arrowheads showing the absence of keel. 31. The distal raphe end deflected dorsally (arrow) and arrowheads showing the absence of keel. 32. A broken frustule is showing the striation of the external valve, and a single row of poroids (arrows) on the valvocopula. 33, 34. Valves are showing the C-type areolae foramina (arrows). Scale bar = 2 μm (Figs 29, 32), 1 μm (Figs 30–31, 33), 0.5 μm (Fig. 34).
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