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109 results for “Cocconeis”
Figs 15–20 in Cocconeis molesta Kütz., C. diaphana W.Sm. and C. dirupta W.Greg. (Bacillariophyta): type material, ambiguities and possible synonymies
Figs 15–20. Cocconeis molesta Kütz. 15–17. From BM 18381 (15–16: holotype illustration); helictoglossae deflected in opposite directions (15, arrowheads), SV axial rows in a zig-zag pattern (16–17). 18–20. From IX-43-A13 (H.F. Van Heurck collection), RV striation often difficult to observe (18, arrowhead), RV fascia (19, arrowheads), SV axial rows in a zig-zag pattern (20). Scale bars = 10 µm.
FIGURE 77 in Cocconeis tsara sp. nov., C. santandrea sp. nov. and allied taxa pertaining to the new section Loculatae
FIGURE 77. Cladistic analysis.
FIGURE 76 in Cocconeis tsara sp. nov., C. santandrea sp. nov. and allied taxa pertaining to the new section Loculatae
FIGURE 76. Dichotomous tree. In red the characters and coding permitting to separate taxa.
FIGURES 45–56 in Distribution of the genus Cocconeis (Bacillariophyceae) along the Seogwipo coast of Jeju Island, South Korea
FIGURES 45–56. LM micrographs of Cocconeis species (3). Figs 45–48. Cocconeis scutellum, RV (Fig. 45) and SVs (Figs 46–48). Figs 49–52. C. shikinensis, SVs (Figs 49, 52) and RVs (Figs 50, 51). Figs 53–56. C. schmidtii, RVs (Figs 54, 56) and SVs (Figs 53, 55). Scale bar = 10 μm (Figs 45–56).
FIGURES 100–105 in Distribution of the genus Cocconeis (Bacillariophyceae) along the Seogwipo coast of Jeju Island, South Korea
FIGURES 100–105. SEM micrographs of Cocconeis species (10). Figs 100–102. Cocconeis convexa, the external view of SV (Fig. 100), the external view of RV (Fig. 101) and internal view of RV (Fig. 102). Figs 103, 104. C. stauroneiformis, the external views of SV. Fig. 105. Cocconeis conspicua, SV, the original drawing of Schmidt (1894b, pl.196, fig. 27). Scale bars = 1 μm (Fig. 103), 2 μm (Figs 100–102, 104), 10 μm (Fig. 105).
FIGURES –. Relatively rare Achnanthales (SEM, New Caledonia, Melanesia). Cocconeis margaritata Riaux-Gobin & Al-Handal, oblong SV areolae bordered by siliceous small beads (37–38), Cocconeis paucistriata Riaux-Gobin, Romero, Compère & Al-Handal (39, 40), SV striae composed of a unique areola on each side of the SV sternum (40, arrow), two (to three) marginal areolae (39, 40), simple process apertures on SV mantle (40, twin arrowheads). Cocconeis sigillata Riaux-Gobin & Al-Handal (41), low marginal crista marginalis and biseriate striae (41, arrowhead) split in two parts by an axial raised area. Achnanthidium glyphos Riaux-Gobin, Compère & Witkowski (42), naviculoïd SV shape, one row of marginal oblong SV areolae (42, arrowhead). See the RV of these taxa on their original description (refs cited above). Scale bars = 3 µm (37), 2 µm (42), 500 nm (40), 400 nm (38). in Marine Achnanthales (Bacillariophyceae) from New Caledonia (Melanesia): assemblage specificities, ultramafic environment
FIGURES –. Relatively rare Achnanthales (SEM, New Caledonia, Melanesia). Cocconeis margaritata Riaux-Gobin & Al-Handal, oblong SV areolae bordered by siliceous small beads (37–38), Cocconeis paucistriata Riaux-Gobin, Romero, Compère & Al-Handal (39, 40), SV striae composed of a unique areola on each side of the SV sternum (40, arrow), two (to three) marginal areolae (39, 40), simple process apertures on SV mantle (40, twin arrowheads). Cocconeis sigillata Riaux-Gobin & Al-Handal (41), low marginal crista marginalis and biseriate striae (41, arrowhead) split in two parts by an axial raised area. Achnanthidium glyphos Riaux-Gobin, Compère & Witkowski (42), naviculoïd SV shape, one row of marginal oblong SV areolae (42, arrowhead). See the RV of these taxa on their original description (refs cited above). Scale bars = 3 µm (37), 2 µm (42), 500 nm (40), 400 nm (38).
FIGURES 61–69 in Cocconeis tsara sp. nov., C. santandrea sp. nov. and allied taxa pertaining to the new section Loculatae
FIGURES 61–69. SV loculate areolae from Cocconeis pertaining to the Loculatae section (61–68), compared to SV areola occlusions in C. scutellum Ehrenberg (69). All images at the same scale. Cocconeis scutellum cf. f. decussata (61), C. scutellum cf. var. posidoniae (62), C. tsara sp. nov. (63), C. sp. 1 (64), C. nosybetiana (65), C. sp. 2 (large specimens) (66), C. santandrea sp. nov. (67), C. scutellum cf. var. sullivanensis (68), C. scutellum (69). Arrows indicate the pole/apex of the valve. Scale bars = 300 nm.
FIGURES 59–60 in Cocconeis tsara sp. nov., C. santandrea sp. nov. and allied taxa pertaining to the new section Loculatae
FIGURES 59–60. Cocconeis cf. scutellum var. sullivanensis De Stefano. SEM (Sansego, Croatia, Grunow collection, N° 869). SV external view with strongly radiate striae and complex rectangular loculate areolae (59). Detail of grid-like loculate areola with corroded occlusion (60). Scale bars = 5 µm (59), 2 µm (60).
FIGURES 13–17 in Cocconeis tsara sp. nov., C. santandrea sp. nov. and allied taxa pertaining to the new section Loculatae
FIGURES 13–17. Cocconeis tsara sp. nov. SEM (Anakao, West coast of Madagascar). SV in internal view (13–15, 17), with roundelliptical to square foramina (13–15), narrow straight sternum. SVVC with digitate fimbriae locating on each virga (15). SVVC detached, with irregularly arranged fimbriae (14). Each fimbria with an irregular apex (16, arrowheads). Detail of each loculate areola, with an axial primary thin bar (17, arrowheads) and a perpendicular secondary bar on the bottom of the loculate areola (17, arrow indicates the position of the valve apex). Scale bars = 5 µm (14), 4 µm (13, 15), 1 µm (16), 700 nm (17).
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