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FIGURES 25–29. Planothidium sheathii SEM views. Fig. 25 in Planothidium sheathii a new monoraphid diatom species from rivers in California, USA

FIGURES 25–29. Planothidium sheathii SEM views. Fig. 25. Internal view of RV areolae. Figs 26, 27. Detail of cavum aperture. Note the boarders of the aperture attached to neighbor virgae. Fig. 28. External view of SV periphery and mantle. Striae 5–6 seriate, interrupted at valve mantle junction. Note the separated groups of 8–13 rounded areolae, bordered by 2 elongated areolae on mantle in oblique position to each areola group (arrows). Fig. 29. External view of RV periphery and mantle. Striae 5–6 seriate, interrupted at valve mantle junction. Note the separated groups of 7 rounded areolae on mantle (arrows). All figures from the type locality San Joaquin River, California, USA. All scale bars: 1 μm.

FIGURES 33–36 in Ninastrelnikovia lateritica sp. nov., a new and rare freshwater diatom species from the rocky pools of the Western Ghats, India with a note on the genus Ninastrelnikovia Lange-Bertalot & A.Fuhrmann (Bacillariophyta)

FIGURES 33–36. Close up of internal valves of Ninastrelnikovia lateritica sp. nov. (SEM). 33. Proximal raphe ends strongly deflected onto the same side and internally open areolae. 34 & 35. Distal raphe end ending in helictoglossae. 36. Straight or rudimentarily developed proximal raphe end found in a intermediate valve which attached with another valve by interdigitating, long spatulate spines (arrows). (All scale bars represent 1 μm).

FIGURES 20–28 in Ninastrelnikovia lateritica sp. nov., a new and rare freshwater diatom species from the rocky pools of the Western Ghats, India with a note on the genus Ninastrelnikovia Lange-Bertalot & A.Fuhrmann (Bacillariophyta)

FIGURES 20–28. Detail of the external views of Ninastrelnikovia lateritica sp. nov. frustules (SEM). 20 & 21. Apices showing distal raphe ends of terminal and intermediate valves respectively. 22. Girdle view of the apex of a frustule showing pseudospines (arrows), spatulate spines (arrowheads) with distal raphe end curving towards the mantle. 23. Middle part of the terminal valve showing fully developed raphe system. 24. Middle part of the intermediate valve showing rudimentary raphe. 25. Girdle view of the middle part of a frustule showing pseudospines (arrow), linking spines (arrowhead) and silica granules (round pointer). 26 & 27. Apices showing distal raphe ends of terminal and intermediate valves respectively. 28. Another broken frustule apex showing raphe slit (arrow). (All scale bars represent 1 μm).

FIGURES 15–19 in Ninastrelnikovia lateritica sp. nov., a new and rare freshwater diatom species from the rocky pools of the Western Ghats, India with a note on the genus Ninastrelnikovia Lange-Bertalot & A.Fuhrmann (Bacillariophyta)

FIGURES 15–19. External views of Ninastrelnikovia lateritica sp. nov. frustules (SEM). 15 & 16. Face views of cell colony terminating valves bearing longitudinally oriented siliceous slat system. 17 & 18. Face views of intermediate valves of cell colony showing linking spatulate spines and wedge shaped pluriseriate areolae. 19. Girdle view of cell colony terminating frustule. (All scale bars represent 2 μm).

FIGURES 1–14 in Ninastrelnikovia lateritica sp. nov., a new and rare freshwater diatom species from the rocky pools of the Western Ghats, India with a note on the genus Ninastrelnikovia Lange-Bertalot & A.Fuhrmann (Bacillariophyta)

FIGURES 1–14. LM-micrographs of Ninastrelnikovia lateritica sp. nov., from the type population; valve views showing the size diminution series. Holotype depicted in Fig. 11. 3 & 4. Frustules in valve view with high and low focusing showing distinct raphe and central nodule. 8 & 9. Showing reduced raphes with wider spaced central endings (Scale bar represents 10 μm).

FIGURES 29–32 in Ninastrelnikovia lateritica sp. nov., a new and rare freshwater diatom species from the rocky pools of the Western Ghats, India with a note on the genus Ninastrelnikovia Lange-Bertalot & A.Fuhrmann (Bacillariophyta)

FIGURES 29–32. Internal views of Ninastrelnikovia lateritica sp. nov. frustules (SEM). 29–31. Whole valve showing striae pattern, central area, proximal raphe ends and narrowly elliptical valve shape with gradually swollen centre. 32. One terminal cell (arrows) connected with another intermediate valve that showing proximal raphe end. (All scale bars represent 3 μm).

FIGURES 19–24. Planothidium sheathii SEM views. Figs 19, 20 in Planothidium sheathii a new monoraphid diatom species from rivers in California, USA

FIGURES 19–24. Planothidium sheathii SEM views. Figs 19, 20. External SV view. Fig. 21. Internal SV view with cavum. Figs 22, 23. External RV view. Note the more distant central shortened striae on secondary side (arrowheads). Fig. 24. Internal RV view. All figures from the type locality San Joaquin River, California, USA. All scale bars: 5 μm.

FIGURES 37–40 in Ninastrelnikovia lateritica sp. nov., a new and rare freshwater diatom species from the rocky pools of the Western Ghats, India with a note on the genus Ninastrelnikovia Lange-Bertalot & A.Fuhrmann (Bacillariophyta)

FIGURES 37–40. Close up of internal valves of Ninastrelnikovia lateritica sp. nov. (SEM). 37. Curved proximal raphe end found in a intermediate valve as it bears spines (arrows). 38 & 39. Curved proximal raphe end found in a terminal valve which shows slender siliceous slats (arrows). 40. A broken apical part showing strut like structures which holds the mantle. (All scale bars represent 1 μm).

FIGURES 10–13. SEM, external views. Fig. 10 in Halamphora daochengensis sp. nov., a new freshwater diatom species (Bacillariophyceae) from a small mountain lake, Sichuan Province, China

FIGURES 10–13. SEM, external views. Fig. 10. External view of an entire valve. Fig. 11. Ventral view of entire frustule with girdle bands. Fig. 12. Entire valve seen from the dorsal side in oblique view showing the dorsal mantle and girdle bands. Fig. 13. Entire valve seen from the dorsal side showing the girdle band areolae. Scale bars = 10 μm.

FIGURES 1–9 in Halamphora daochengensis sp. nov., a new freshwater diatom species (Bacillariophyceae) from a small mountain lake, Sichuan Province, China

FIGURES 1–9. LM micrographs of the type population of Halamphora daochengensis in Lake Congqiancuo. Figs 1–7. Valve views, showing the valve variability of the holotype population. Figs 8, 9. Light micrographs showing the frustule in girdle view. Scale bar = 10 μm.

FIGURES 14–19 in Halamphora daochengensis sp. nov., a new freshwater diatom species (Bacillariophyceae) from a small mountain lake, Sichuan Province, China

FIGURES 14–19. SEM, detail of external valve views. Fig. 14. View of central area with numerous girdle bands. Figs 15, 16. View of frustule end and girdle bands with rows of rounded poroids. Fig. 17. External detail of the valve centre. Fig. 18. External detail of valve apex showing the prominent raphe ledge. Fig. 19. External detail of part of the dorsal valve, valve face/mantle margin and mantle. Scale bars =2 μm (Figs 14, 17), 3 μm (Fig. 18), 5 μm (Figs 15, 16, 19).

FIGURES 20–25. SEM, internal valve views. Fig. 20 in Halamphora daochengensis sp. nov., a new freshwater diatom species (Bacillariophyceae) from a small mountain lake, Sichuan Province, China

FIGURES 20–25. SEM, internal valve views. Fig. 20. Internal view of entire valve with girdle bands. Fig. 21. Oblique view of valve. Fig. 22, 23. Internal view of valve apex with prominent helictoglossa. Fig. 24. Internal view of valve centre with girdle bands. Fig. 25. Internal view of valve centre with fused helictoglossa. Scale bars = 2 μm (Figs 22, 23), 3 μm (Fig. 25), 5 μm (Figs 20, 21, 24).

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FIGURES 22–27 in Prestauroneis genkalii-a new diatom species (Bacillariophyceae: Stauroneidaceae) from Southeast Asia

FIGURES 22–27: Prestauroneis genkalii Glushchenko, Kulikovskiy & Kociolek, sp. nov. SEM. External view (Figs 22–24), internal view (Figs 25–27). Figs 22: Whole valve, raphe filiform, proximal raphe endings are slightly expanded, weakly unilaterally curved, distal raphe fissures unilaterally curved in opposite way to proximal ends. Fig. 23: Central area, proximal raphe ends, openings of areolae are variable in shape and orientation, rounded to elliptic. Fig. 24: Distal raphe fissure. Fig. 25. Raphe filiform, helictoglossae are small, the raphe located on weakly pronounced sternum-like structure, pseudoseptae are present on the mantle of each valve apex. Fig. 26: Central area, proximal raphe endings indistinct and sometimes hook-like, openings of areolae round, occluded by hymenes. Fig. 27: Pseudosepta present, openings of areolae round, occluded by hymenes. Scale bars = 5 μm (Figs 22, 25); 1 μm (Figs 23, 24, 26, 27).

opennotspecifiedAug 2019View details →

FIGURES 1–21 in Prestauroneis genkalii-a new diatom species (Bacillariophyceae: Stauroneidaceae) from Southeast Asia

FIGURES 1–21: Prestauroneis genkalii Glushchenko, Kulikovskiy & Kociolek, sp. nov. LM, DIC. Slide no 04853. Size diminution series. Figure 9 is of the holotype. Scale bar = 10 μm.

FIGURES 28–31. Gomphonema bicepiformis, SEM. Internal view. 28 in Gomphonema bicepiformis sp. nov., a new diatom species (Bacillariophyta) from a stream in Zhejiang, China

FIGURES 28–31. Gomphonema bicepiformis, SEM. Internal view. 28. Whole valves, showing pseudosepta at both ends and helictoglossae. 29. Central portion of the valve showing deflected central raphe endings, and internal opening of the stigma. 30. Interior view of the headpole showing the small helictoglossa. 31. Internal view of footpole showing the helictoglossa, pseudoseptum and raphe slit. Scale bars = 10 μm(Fig. 28), 2 μm(Figs 29–31).

FIGURES 1–14 in Gomphonema bicepiformis sp. nov., a new diatom species (Bacillariophyta) from a stream in Zhejiang, China

FIGURES 1–14. Light microscopy of Gomphonema bicepiformis W. Zhang & Kociolek, valve views showing the size diminution series. Scale bar = 10 μm.

FIGURES 20–27. Gomphonema bicepiformis, SEM. External view. 20–21 in Gomphonema bicepiformis sp. nov., a new diatom species (Bacillariophyta) from a stream in Zhejiang, China

FIGURES 20–27. Gomphonema bicepiformis, SEM. External view. 20–21. External view of the capitate headpole with the external distal raphe end curving onto the valve mantle. Striae uniseriate, mostly composed of slit-like, "C-" shaped or triangular areolae, occasionally biseriate. 22–24. External view of the central portion of the valve showing wide axial area with circular and irregular depressions, smallll and rectangular stigma, small marginal ridge separating the valve face from the mantle. 25. External view of the valve face between the central portion and footpole showing irregular depressions and biseriate striae. 26–27. External view of the capitate footpole with the deflected distal end of raphe, rounded porelli and irregular shaped depressions at valve terminus. Scale bars = 2 μm.

FIGURES 15–19. Gomphonema bicepiformis W in Gomphonema bicepiformis sp. nov., a new diatom species (Bacillariophyta) from a stream in Zhejiang, China

FIGURES 15–19. Gomphonema bicepiformis W. Zhang & Kociolek, SEM. Exterior view of a whole valve, showing the valve variability of the holotype, slightly undulate raphe with rounded proximal ends, gibbous central portion, round, capitate foot pole and headpole. Scale bars = 10 μm.

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FIGURES 2–5 in Halamphora primus (Bacillariophyta): a new diatom species from the Gulf of California, Mexico

FIGURES 2–5. LM. 3) Cingular band; 3a–5a). Different focal distances of large Halamphora primus sp. nov. with acute apices curved upward. 3a–4b) Medium size specimen with incipient acute apices. 5a–b) Small specimen with both rounded and tapering apices. Scale bar = 10 μm for all images. From holotype slide DIATOMARIO-UABCS LPSR-I!.