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12 results for “Rhoicosphenia”
FIGURES 105–110 in Taxonomy of three new Rhoicosphenia (Bacillariophyta) species from California, USA
FIGURES 105–110. Type material of Rhoicosphenia californica from Big Chico Creek, Butte County, California, USA. SEM. 105–108. External views of the D-valve show the shortened raphe branches and round to lineolate areolae (105). The distal raphe end at the head pole terminates on the valve face (106) and continues onto the mantle at the foot pole (107). The proximal raphe end at the head pole is small (106) and at the foot pole is dilated (107). In girdle view, the foot pole can be seen on each valve along with a single row of simple poroids on the valvocopula (108). Internal views show the external areolae through troughs between the virgae (109). Pseudosepta are covered at each pole by the valvocopula and the raphe branches extend beyond the pseudosepta at each pole (109). The proximal raphe end at the foot pole is crook-shaped and a small aperture in the valvocopula is evident (109). In girdle view, the valvocopula are ornamented with a single row of simple poroids (110). Scale bars are 2 μm (105, 110), 1 μm (106–109).
FIGURES 98–104 in Taxonomy of three new Rhoicosphenia (Bacillariophyta) species from California, USA
FIGURES 98–104. Type material of Rhoicosphenia californica from Big Chico Creek, Butte County, California, USA. SEM. 98–101. External views of the R-valve show rounded puncta near the axial area and lineate puncta towards the margins (98, 100). At the head pole, the raphe continues onto the mantle and an open girdle band is visible (99). The central area has inflated proximal raphe ends (98, 100), and the foot pole has an apical pore field of rounded porelli (101). Internal views show the areolae through troughs between the virgae (102–104) and the proximal raphe ends are strongly crook-shaped in the same direction (103, 104). The valvocopula in modified to overlap the pseudosepta and an aperture is present in the valvocopula at the head pole (102, 104), but not at the foot pole (104). Scale bars are 5 μm (98) and 1 μm (99–104).
FIGURES 67–74 in Taxonomy of three new Rhoicosphenia (Bacillariophyta) species from California, USA
FIGURES 67–74. Type material of Rhoicosphenia lowei from Ash Creek, Lassen County, California, USA. SEM. 67–70. The external of the D-valve is characterized by the shortened raphe branches and lineolate areolae (67). The distal raphe end on D-valve terminates on valve face and the head pole (68) and continues onto the mantle at the foot pole (69). The proximal raphe ends are dilated and drop-shaped (68–69). In girdle view, the foot pole has apical pore fields on each valve and the valvocopula has a single row of round poroids (70). 71–74. Internal views of the D-valve show troughs between the virgae (72) as well as lineolate internal openings to the external areolae (71–74). Prominent pseudosepta are present at each pole (71, 73, 74) and raphe branches extend beyond the pseudosepta at each pole (71, 73). The proximal raphe ends are crook-shaped in the same direction (71, 73). Scale bars are 10 μm (67, 74), 1 μm (68–73).
FIGURES 38–58 in Taxonomy of three new Rhoicosphenia (Bacillariophyta) species from California, USA
FIGURES 38–58. Type material of Rhoicosphenia lowei from Ash Creek, Lassen County, California, USA. LM. 45. Holotype specimen. 40, 41, 44–46, 48, 50, 51, 53, 55, 57, 58. R-valves. 42, 43, 47, 49, 52, 56. D-valves. 39, 54. Girdle views. 38. Post-auxospore. Scale bar is 10 μm.
FIGURES 59–66 in Taxonomy of three new Rhoicosphenia (Bacillariophyta) species from California, USA
FIGURES 59–66. Type material of Rhoicosphenia lowei from Ash Creek, Lassen County, California, USA. SEM. 59–62. External views of R-valve show the bluntly rounded head pole, lineolate areolae, and dilated proximal raphe ends. The apical pore field has porelli that are more densely arranged, smaller, and rounder than the stria areolae (62). The distal raphe ends on R-valve continue onto the mantle (60, 62). 63–66. Internal R-valve shows the valvocopula is modified to overlap with the pseudosepta at each end of valve (63, 65, 66). The internal proximal raphe ends are strongly crook-shaped in the same direction (64). Scale bars are 10 μm (59), 1 μm (60–66).
FIGURES 31–37 in Taxonomy of three new Rhoicosphenia (Bacillariophyta) species from California, USA
FIGURES 31–37. Type material of Rhoicosphenia stoermeri from Bear Creek, Los Angeles County, California, USA. SEM. 31, 33, 34. External views of the D-valve show the shortened raphe branches and lineolate areolae (31, 33). Distal raphe end on D-valve terminates on valve face at head pole (33) and continues onto mantle at foot pole (34). Proximal raphe ends on D-valve (31, 33, 34) are dilated and drop-shaped. 32, 35, 36. Internal D-valve with troughs between the virgae as well as lineolate internal openings to the external areolae (32, 35). Pseudosepta are present at each pole and raphe branches extend beyond the pseudosepta at each pole (32). Valvocopula modified to cover pseudosepta on valve interior (35, 36). Interior views of head and foot pole with crook-shaped internal proximal raphe ends (35, 36). 37. In girdle view, valve flexure is illustrated and girdle elements are each ornamented with one row of simple poroids Scale bars are 10 μm (32, 37), 5 μm (31), and 1 μm (33–36).
FIGURES 23–30 in Taxonomy of three new Rhoicosphenia (Bacillariophyta) species from California, USA
FIGURES 23–30. Type material of Rhoicosphenia stoermeri from Bear Creek, Los Angeles County, California, USA. SEM. 23, 25–27. External R-valve outline, panduriform central area, and dilated proximal raphe ends (23, 26). Distal raphe ends on the R-valve continue onto the mantle (25, 27). Apical pore fields are present only at the foot pole and porelli are linear and obliquely arranged (27). 24, 28–30. Internally, the valvocopula is modified to fit over and near entirely cover the pseudoseptum and has an aperture at the head pole (24, 28, 30). Internal valve views show panduriform central area and proximal raphe ends strongly hooked in the same direction (24, 29). The areolae can be seen in troughs between the virgae (29). Scale bars are 10 μm (23–24) and 1 μm (25–30).
FIGURES 1–22 in Taxonomy of three new Rhoicosphenia (Bacillariophyta) species from California, USA
FIGURES 1–22. Type material of Rhoicosphenia stoermeri from Bear Creek, Los Angeles County, California, USA. LM. 10. Holotype specimen. 1, 2, 4, 6, 7, 10, 12, 14, 15, 18, 20, 22. R-valves. 3, 5, 9, 11, 13, 16, 19, 21. D-valves. 8, 17. Girdle views. Scale bar is 10 μm.
FIGURES 75–97 in Taxonomy of three new Rhoicosphenia (Bacillariophyta) species from California, USA
FIGURES 75–97. Type material of Rhoicosphenia californica from Big Chico Creek, Butte County, California, USA. LM. 84. Holotype specimen. 76, 78, 81, 84–86, 88–90, 92, 94, 96. R-valves. 77, 80, 82, 83, 87, 91, 93, 97. D-valves. 75, 95. Girdle views. 79. Valvocopula. Scale bar is 10 μm.
FIGURES 12–25 in Rhoicosphenia johannessoniae (Bacillariophyceae), a new diatom from the Swedish coast of the Baltic Sea
FIGURES 12–25. SEM images of the R-valve of Rhoicosphenia johannessoniae sp. nov., Fig. 12. External side of the valve, note the position of the central area towards the base pole, Fig.13. Girdle view of the valve with a cingular band attached, Fig. 14. Tilted view of the valve showing the internal side with the central nodule and the valvocopulae on the poles, Fig.15. The central nodule and raphe proximal endings, Fig. 16. External side of the head pole showing the hooked raphe distal ending which terminate on valve mantle, Fig. 17. External side showing the central area and the isolated areola inside. Fig.18. External side of the base pole with pore field and distal raphe ending. Scale bars: 5 μm (Figs 44–47), 1 μm (Figs 48, 50, 51), 0.4 μm (Fig. 49).
FIGURES 1–11 in Rhoicosphenia johannessoniae (Bacillariophyceae), a new diatom from the Swedish coast of the Baltic Sea
FIGURES 1–11. LM images of Rhoicosphenia johannessoniae sp. nov., Figs 1–5. R-valve. Figs 6–10. D-valve (note the narrowly protracted subcapitate base poles), Fig. 11. Whole frustule. Scale bar: 10 μm.
FIGURES 19–25 in Rhoicosphenia johannessoniae (Bacillariophyceae), a new diatom from the Swedish coast of the Baltic Sea
FIGURES 19–25. SEM images of the D-valve of Rhoicosphenia johannessoniae sp. nov. Fig. 19. Internal side with pseudoseptae on the poles, note the bluntly rounded base valve apex, Fig. 20. External side showing reduced raphe branches, Fig. 21. Girdle view of the valve with a cingular band attached, Fig. 22. External side of the head pole showing slit-like areolae, Fig. 23. External side of the base pole with the reduced raphe branch and pore field, Fig. 24. External side of the head pole with very short raphe branch and slit-like areolae, Fig. 25. Internal side of the base pole with pseudoseptum and raphe branch. Scale bars 5 μm (Figs 52–54), 1 μm (Figs 55–58).
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