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109 results for “Cocconeis”
FIGURES 12–21 in Cocconeis tortilis: a new marine diatom (Bacillariophyta, Cocconeidaceae) from Japan
FIGURES 12–21: Cocconeis tortilis, SEM (12–19, 21) and TEM (20), raphid valves (RV). Figs 12, 14, 15, 18, 19, 21: External views. Figs 13, 16, 17: Internal views. Figs 12, 13: Whole valves. Figs 14, 16: Distal raphe ends in terminal area. Arrow indicates helictoglossa. Figs 15, 17: Proximal raphe ends in central area. Figs 18, 19: Central areas extending laterally to the valve margin, forming the stauros (asterisks). Figs 20, 21: Areolae occluded by the hymenes with linear perforations in a centric array.
FIGURES 32–37 in Cocconeis sawensis sp. nov. (Bacillariophyceae) from a saline lake (Sawa Lake), South Iraq: comparison with allied taxa
FIGURES 32–37. SEM micrographs of Cocconeis sawensis sp. nov. Figs 32–33, tilted views showing opening of the sternum valve valvocopula, connecting band and raphe valve valvocopula (beneath). Figs 34–37, small pores or concave filled structures distributed near valve apices and in the middle of the internal side of sternum valve (white arrows).
FIGURES 26–31 in Cocconeis sawensis sp. nov. (Bacillariophyceae) from a saline lake (Sawa Lake), South Iraq: comparison with allied taxa
FIGURES 26–31. SEM micrographs of Cocconeis sawensis sp. nov. Fig. 26, raphe valve valvocopula fimbriae in abvalvar side, note that they are formed of three knob-like silica thickenings and arranged alternately with rows of areolae. Fig. 27, raphe valve fimbriae lying on virgae. Fig. 28, internal side of raphe valve showing valvocopula in place, fimbriae and areolae with hymenes. Figs 29–30, sternum valve valvocopula with short fimbriae (in advalvar side, Fig. 29 and abvalvar side, Fig. 30). Fig. 31, abvalvar side of the sternum valve valvocopula.
FIGURES 22–25 in Cocconeis sawensis sp. nov. (Bacillariophyceae) from a saline lake (Sawa Lake), South Iraq: comparison with allied taxa
FIGURES 22–25. SEM micrographs of Cocconeis sawensis sp. nov. Fig. 22, external sternum valve areolae occluded by hymenes positioned below the surface of the valve and showing very fine transverse slits. Fig. 23, tilted view of sternum valve areolae with eroded hymenes. Figs 24,25 areolae of external side of raphe valve occluded by hymenes positioned below the surface of the valve and showing short radial slits.
FIGURES 16–21 in Cocconeis sawensis sp. nov. (Bacillariophyceae) from a saline lake (Sawa Lake), South Iraq: comparison with allied taxa
FIGURES 16–21. SEM micrographs of the raphe valve of Cocconeis sawensis sp. nov. Fig. 16 shows the internal side with the marginal rim composed of silicified irregular segments around the valve. Fig. 17 shows external side with straight raphe, note the eccentric raphe endings. Fig. 18, shows the central nodules ending in different directions and the slightly raised and round central area. Fig. 19, Tilted view of the internal side of the valve showing valve curvature, raised central area and the silicified rim. Fig. 20, internal view of apex showing small helictogloss. Fig. 21, external view of apex.
FIGURES 10–15 in Cocconeis sawensis sp. nov. (Bacillariophyceae) from a saline lake (Sawa Lake), South Iraq: comparison with allied taxa
FIGURES 10–15. SEM micrographs of the sternum valve of Cocconeis sawensis sp. nov. Fig. 10, external view of the SV. Fig. 11, internal view of the valve with the raised and thick sternum. Figs 12,13 external view showing valve curvature, and vestigial raphe structures. Fig. 14, enlarged part of the internal side showing slightly elevated axial area. Fig. 15, internal side with the valvocopula still attached. Note the presence of a pore-like structure on one apex and the eccentric valvocopula opening.
FIGURES 2–9 in Cocconeis sawensis sp. nov. (Bacillariophyceae) from a saline lake (Sawa Lake), South Iraq: comparison with allied taxa
FIGURES 2–9: Light micrographs of Cocconeis sawensis sp. nov. Figs 2–4 valves with slightly different shapes. Figs 5–7 showing sternum valves. Fig. 8 shows variation in size of raphe valve. Fig. 9 shows variation in size of sternum valve.
FIGURES 38–41 in Cocconeis sawensis sp. nov. (Bacillariophyceae) from a saline lake (Sawa Lake), South Iraq: comparison with allied taxa
FIGURES 38–41. SEM micrographs of Cocconeis sawensis sp. nov. teratologic forms of raphe valve (Figs 38, 39) and sternum valve (Figs 40, 41).
FIGURES 47–54 in Cocconeis tsara sp. nov., C. santandrea sp. nov. and allied taxa pertaining to the new section Loculatae
FIGURES 47–54. Cocconeis santandrea sp. nov. SEM (Rapa Archipelago). RV in internal view, with a marginal raised rim with regularly spaced lateral warts facing each marginal biseriate stria (47–48, 50). Helictoglossa simple (48), central area small elliptic (49). RV hymenate occlusions in internal view, with radiate short slits perpendicular to the frame (51). RVVC still in place with irregularly spaced fimbriae, up to each 4 virgae (52, arrowhead). Detail of the papillae with furrows (53–54, arrowheads). Scale bars = 5 µm (47, 52), 2 µm (54), 1 µm (48–50, 53), 500 nm (51).
FIGURES 18–25 in Cocconeis tsara sp. nov., C. santandrea sp. nov. and allied taxa pertaining to the new section Loculatae
FIGURES 18–25. Cocconeis tsara sp. nov. SEM (Anakao, West coast of Madagascar). RV in external view (18–25). Radiate striae, regularly spaced, uniseriate even after the marginal hyaline rim (18). Valve concave with a narrow cingulum (19). Round apices. RVVC open (20, arrowheads), second copula with a ligula (20, twin arrows). Apex void of areolae (21, arrow). Terminal raphe ending roundish. Marginal row of RV areolae enlarged (22, arrow) or axially split (20, arrow). Central area small (23, arrow), RV areolae externally concave (24, arrow). Proximal raphe endings roundish and close to each other (25). Scale bars = 4 µm (19), 3 µm (18), 2 µm (21), 1 µm (20, 22–23, 25), 700 nm (24).
FIGURES 34–39 in Cocconeis tsara sp. nov., C. santandrea sp. nov. and allied taxa pertaining to the new section Loculatae
FIGURES 34–39. Cocconeis santandrea sp. nov. SEM (Marquesas and Rapa Archipelagos). SV in external views. Valve largely elliptical. Regularly spaced, slightly radiate striae, large squared areolae in regular axial rows (34–35), loculate areolae with regular X-cross (decussate cross), striae multiseriate (up to tetra-seriate) on one quarter of the valve (34). Loculate areolae strongly concave in external side (35). Loculate areolae with short regular pegs, often ornamented with warts (37, arrowheads; 39, black arrowheads). Loculate areola hymen with pores (39, arrow). Broken SV showing the SVVC in advalvar view (36). Detail of Fig. 36, with the digitate SVVC fimbriae with undulated basis, RVVC with oblong papillae with furrows (38, arrow). Scale bars = 7 µm (36), 5 µm (34), 2 µm (35, 38), 1 µm (37), 300 nm (39). Long arrow in Fig. 37 indicates position of valve apex.
FIGURES 55–58 in Cocconeis tsara sp. nov., C. santandrea sp. nov. and allied taxa pertaining to the new section Loculatae
FIGURES 55–58. Cocconeis sp. 1. SEM (Anakao, West coast of Madagascar). SV external view with diamond-like loculate areolae (55– 57, arrow indicates the position of the valve apex). Entire broken frustule (57), RV biseriate on a short marginal section (58, arrowhead), RVVC with short fimbriae every three virga, oblong papillae without furrows (58, framed arrow), SVVC with short fimbriae (57, arrow). Scale bars = 3 µm (55), 2 µm (57), 700 nm (58), 500 nm (56).
FIGURES 42–46 in Cocconeis tsara sp. nov., C. santandrea sp. nov. and allied taxa pertaining to the new section Loculatae
FIGURES 42–46. Cocconeis santandrea sp. nov. SEM (Rapa Archipelago). RV in external view. Regularly spaced and uniseriate radiate striae, small round areolae and marginal hyaline area (42, 45, arrowhead), becoming biseriate with alternate areolae (in ears of wheat) from the rim to the margin (43–44, arrows). Note the row if bigger and deep areolae close to the rim (44, arrow). Central area reduced and proximal raphe endings close to each other (46). Scale bars = 5 µm (42, 45), 1 µm (43–44, 46).
FIGURES 26–29 in Cocconeis tsara sp. nov., C. santandrea sp. nov. and allied taxa pertaining to the new section Loculatae
FIGURES 26–29. Cocconeis tsara sp. nov. SEM (Anakao, West coast of Madagascar). RV in internal view (26–29). Raised marginal rim, proximal raphe ending bent in opposite sides, marginal areolae axially split in two parts (26, arrow). RVVC with fimbriae with hammerlike endings (27, arrows) and oblong and smooth papilla (27, framed arrowhead). Hammer-like fimbriae (28, arrowheads), fimbriae each two virgae. No areolae on apex (29, arrow), vestigial fimbriae (29, arrowheads) between each virga, helictoglossa discreet (29). Scale bars = 3 µm (26), 700 nm (28–29), 500 nm (27).
FIGURES 1–8 in Cocconeis tsara sp. nov., C. santandrea sp. nov. and allied taxa pertaining to the new section Loculatae
FIGURES 1–8. Cocconeis tsara sp. nov. LM (Anakao, West coast of Madagascar). SV with round-elliptical areolae, multiseriate on the margin, RV with dense striation and well-marked hyaline rim close to the margin (1). RVs with distinct areolae and discreet central area (2–3). SVs with round to square areolae in more or less regular axial rows (4–6). SVVC closed with digitate fimbriae not always regularly disposed (7). RVVC open with short and peged fimbriae irregularly arranged (8). Scale bars = 10 µm (phase-contrast: 1, 7–8; Nomarski interference contrast: 2–6).
FIGURES 70–75 in Cocconeis tsara sp. nov., C. santandrea sp. nov. and allied taxa pertaining to the new section Loculatae
FIGURES 70–75. Original drawings of C. japonica A.Schmidt (70), C. scutellum var. japonica Skvortzow (71), C. scutellum var. ornata Grunow (in Peragallo & Peragallo 1897) (72), C. scutellum var. pulchra Missuna (73), C. speciosa W.Gregory (75), C. scutellum var. schmidtii (schmidti) Frenguelli (74). Scale bars = 10 µm.
FIGURES 30–33 in Cocconeis tsara sp. nov., C. santandrea sp. nov. and allied taxa pertaining to the new section Loculatae
FIGURES 30–33. Cocconeis cf. tsara. SEM ('Océane' Chelonia mydas, Moorea, Society Archipelago). SV in external view (30–33). Valve narrow-elliptic. Regularly spaced and slightly radiate striae, round-squared areolae (30, 32), loculate areolae with irregular cross, primary bar sometime double (33, arrowheads), secondary bar sometime arborescent or in zig-zag (33, arrows). Note the vestigial raphe on apices (30, 31, circles). Scale bars = 2 µm (30, 32), 1 µm (31), 500 nm (33).
FIGURES 9–12 in Cocconeis tsara sp. nov., C. santandrea sp. nov. and allied taxa pertaining to the new section Loculatae
FIGURES 9–12. Cocconeis tsara sp. nov. SEM (Anakao, West coast of Madagascar). SV in external view (9–12), regularly spaced and strongly radiate striae, round-square areolae in irregular axial rows (9, 12), loculate areolae with irregular cross, sometime incomplete (10, arrowhead). Each sector of the loculate areolae externally closed by hymenes with slits, perpendicular to the frame of the sector (10–11, arrows indicate the position of the valve apex). Scale bars = 4 µm (9, 12), 400 nm (10–11).
FIGURES 40–41 in Cocconeis tsara sp. nov., C. santandrea sp. nov. and allied taxa pertaining to the new section Loculatae
FIGURES 40–41. Cocconeis santandrea sp. nov. SEM (Marquesas). SV in internal view. Narrow sternum, round foramina (40). Each loculate areola has an internal domed center with pores (41, arrow). Long arrow indicates the position of the valve apex. Scale bars = 5 µm (40), 300 nm (41).
Figs 21–26. Cocconeis diaphana W in Cocconeis molesta Kütz., C. diaphana W.Sm. and C. dirupta W.Greg. (Bacillariophyta): type material, ambiguities and possible synonymies
Figs 21–26. Cocconeis diaphana W.Sm. var. diaphana from BM 23161, "Jersey, Pontac". 23. Lectotype illustration. SV sternum narrow and straight (21–22), SV central area small (21, arrow), SV axial rows in a zig-zag pattern (21–22, 26). RV striation easily discernible and beaded (23, arrowhead), RV central area transapically enlarged but short (24, arrows), proximal raphe endings robust and close (25). Scale bars = 10 µm (21–25), 5 µm (26).
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