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36 results for “Achnanthes”
FIGURES 171–174 in Morphological variability within the Achnanthidium minutissimum species complex (Bacillariophyta): comparison between the type material of Achnanthes minutissima and related taxa, and new freshwater Achnanthidium species from Portugal
FIGURES 171–174. SEM micrographs of the type material of Achnanthes minutissima var. inconspicua Østrup (Østrup collection, 753–2). 171. External view of a raphe valve, with central area as a rectangular fascia. 172. Internal view of a raphe valve. 173. External view of raphe valve with a single row of slit-like areolae, clearly visible on the mantle. 174. External view of a rapheless valve. Scale bars = 1 μm.
FIGURES 403–466 in Morphological variability within the Achnanthidium minutissimum species complex (Bacillariophyta): comparison between the type material of Achnanthes minutissima and related taxa, and new freshwater Achnanthidium species from Portugal
FIGURES 403–466. LM micrographs of Achnanthidium lusitanicum Novais & M.Morais, sp. nov. 403–445. Janeiro de Baixo, Zêzere River (Tejo basin), 08–07–2006 (394/06), type locality; 443 is of the holotype. 446–466. Boeiro, Sertã Stream (Tejo basin), 09-07-2006 (324/06). Scale bar = 10 μm.
FIGURES 380–385 in Morphological variability within the Achnanthidium minutissimum species complex (Bacillariophyta): comparison between the type material of Achnanthes minutissima and related taxa, and new freshwater Achnanthidium species from Portugal
FIGURES 380–385. SEM micrographs of Achnanthidium pseudolineare Van de Vijver, Novais & Ector from Portela do Homem, Homem River, Cávado basin, 26-09-2007 (34/07). 380. Raphe valve in external view. 381. Raphe valve in internal view. 382. Rapheless valve in external view. 383. Rapheless valve in internal view. 384. Detail of a raphe valve in external view, with the straight, not expanded, proximal pores and distal ending. The elongated, mostly slit-like areolae on the mantle are clearly visible. 385. Detail of a raphe valve in internal view, with the straight raphe ending, terminating in a small helictoglossa. Scale bars = 1 μm.
FIGURES 390–394 in Morphological variability within the Achnanthidium minutissimum species complex (Bacillariophyta): comparison between the type material of Achnanthes minutissima and related taxa, and new freshwater Achnanthidium species from Portugal
FIGURES 390–394. SEM micrographs of Achnanthidium pseudolineare Van de Vijver, Novais & Ector from Covas, Coura River, Minho basin, 21–09–2007 (224/07). 390. Detail of the apex of a raphe valve in external view, with the straight distal raphe ending. 391. Detail of the central area of a raphe valve in external view, bordered by spaced shorter striae formed by transapically elongated areolae, and the straight, not expanded, proximal pores. 392. Detail of the apex of a raphe valve in internal view, with the raphe ending in a small helictoglossa. 393. Detail of the apex of a rapheless valve in internal view. 394. Complete frustule in girdle view, with the slit-like areolae on the mantle. Scale bars = 1 μm.
FIGURES 175–258 in Morphological variability within the Achnanthidium minutissimum species complex (Bacillariophyta): comparison between the type material of Achnanthes minutissima and related taxa, and new freshwater Achnanthidium species from Portugal
FIGURES 175–258. LM micrographs of the type material and several populations of Achnanthidium nanum (F.Meister) Novais & Jüttner, comb. nov. from Portugal, Nepal, Scotland and Switzerland. 175–214. Côja, Alva River, Mondego basin, Portugal, 11-06-2007 (325/07). 215–238. Himalayan streams, Nepal, M62, K52, Helan 16 (NMW.C.2007.006.M62, NMW.C.2007.006.K52, NMW.C.2007.006.He16). 239–248. Foveran Burn, Mill of Newburgh, Scotland (NMW.C.2011.050.SEPA.1810037). 249–258. Achnanthes nana F.Meister (F. Meister collection, #2432), Riffelsee, Switzerland. Scale bar = 10 μm.
FIGURES 163–170 in Morphological variability within the Achnanthidium minutissimum species complex (Bacillariophyta): comparison between the type material of Achnanthes minutissima and related taxa, and new freshwater Achnanthidium species from Portugal
FIGURES 163–170. SEM micrographs with details of the type material of Achnanthes minutissima var. cryptocephala Grunow in Van Heurck (Van Heurck Types du Synopsis 238). 163. Apice of a raphe valve in external view, showing rounded areolae at the extremity and slit-like areolae in the valve margin. 164. Apice of a raphe valve in internal view, with the transapically elongated areolae in the valve margin. 165. Apice of a rapheless valve in external view, with the slit-like areolae in the valve margin and in the mantle. 166. Apice of a rapheless valve in internal view, with the transpically elongated areolae in the valve margin. 167. Central area of a rapheless valve in external view, with elliptical shape and bordered by alternating shorter and longer striae. 168. Central area of a rapheless valve in internal view, with elliptical shape and bordered by shorter striae. 169. Central area of a raphe valve in external view, showing the rectangular fascia and the straight not expanded proximal pores. 170. Central area of a raphe valve in internal view, showing the rectangular fascia and the proximal raphe pores slightly deflected into opposite directions. Scale bars = 1 μm.
FIGURES 395–398 in Morphological variability within the Achnanthidium minutissimum species complex (Bacillariophyta): comparison between the type material of Achnanthes minutissima and related taxa, and new freshwater Achnanthidium species from Portugal
FIGURES 395–398. SEM micrographs of Achnanthidium duriense Novais & Ector, sp. nov. from A-do-Bispo, Torto River, Douro basin, 18-08-2007 (129/07). 395. Raphe valve in external view. 396. Raphe valve in internal view. 397. Rapheless valve in external view. 398. Rapheless valve in internal view. Scale bars = 1 μm.
FIGURES 145–152 in Morphological variability within the Achnanthidium minutissimum species complex (Bacillariophyta): comparison between the type material of Achnanthes minutissima and related taxa, and new freshwater Achnanthidium species from Portugal
FIGURES 145–152. SEM micrographs with details of the type material of Achnanthes minutissima Kütz. (isotype material, Kützing's Algarum Aquae Dulcis Germanicarum, Decade VIII, no. 75, Kützing 301). 145. Apice of a rapheless valve in girdle view, with the slit-like areolae in the mantle. 146. Apice of a rapheless valve in external view, with the rounded areolae in the apice and transapically elongated areolae in the valve margin. 147. Central area of a rapheless valve in external view. 148. Central area of a rapheless valve in internal view, with the areolae covered by hymenes. 149. Central area of a raphe valve in external view, showing the straight proximal raphe pores. 150. Central area of a raphe valve in a tilted internal view, with the proximal raphe pores slightly deflected in opposite directions. 151. Apice of a raphe valve in external view, with the distal ending slightly deflected. 152. Apice of a rapheless valve in internal view, with the areolae covered by hymenes. Scale bars = 1 μm.
FIGURES 45–51. Achnanthes trachyderma. Individuals from Society Archipelago, SEM. 45 in Achnanthes citronella, A. trachyderma comb. nov. (Bacillariophyta) and allied taxa pertaining to the same morphological group
FIGURES 45–51. Achnanthes trachyderma. Individuals from Society Archipelago, SEM. 45. SV external side, with narrow sternum. 46. Apices with areolae (arrowhead). 47. Valvocopulae system lacking fimbriae (arrowhead). 48. SV internal side, with open SVVC (arrow) and no fimbriae (arrowheads). 50. Internal SV areolae pattern and no areolae on apices. 49. Detail of the cingulum composed of the two valvocopulae (SVVC and RVVC) and a supplementary copula (C). 51. Detail of the internal structure of the SV areolae. Scale bars = 5 μm (Figs 45–48, 50); 1 μm (Figs 49, 51).
FIGURES 25–32. 25, 26. Achnanthes citronella. Individuals from type slide 43609 in Achnanthes citronella, A. trachyderma comb. nov. (Bacillariophyta) and allied taxa pertaining to the same morphological group
FIGURES 25–32. 25, 26. Achnanthes citronella. Individuals from type slide 43609, labelled as 'Jolo Jolo, Sulu, Philippine Islands, 3-17' (see Fig. 34), A. Mann's collection, housed in US. Lemon-shaped SV with an elliptic SV sternum (Fig. 25, arrowhead) and rectangular areolae without axial arrangement, RV finely striated, detached open valvocopula without fimbriae (Fig. 26, arrow) and a short butterflyshaped stauros. 27–32. Achnanthes trachyderma. 27–29. Individuals from Meister's slides collection, housed in Z. Frustule from slide 3409001 showing a large RV stauros and fine RV striae (Fig. 27), and SV coarse striation (Fig. 28). 29. Illustration of the lectotype. A RV from slide 309008, with a fine striation and a narrow extended stauros. 30–32. Achnanthes trachyderma. Individuals from Society Archipelago, South Pacific, with relatively large stauros (Fig. 30, arrowheads), SV striae parallel, only slightly radiate at the apices, narrow sternum (Fig. 31). 32. RV with fine striae and large and thin stauros. Scale bars = 10 μm.
FIGURES 1–24. 1. Stauroneis apiculata. 2, 3. Cocconeis apiculata. 4 in Achnanthes citronella, A. trachyderma comb. nov. (Bacillariophyta) and allied taxa pertaining to the same morphological group
FIGURES 1–24. 1. Stauroneis apiculata. 2, 3. Cocconeis apiculata. 4. Stauroneis(?) obesa. 5. Cocconeis robusta. 6. Rhaphoneis mammalis. 7–9. Achnanthes mammalis. 10. Achnanthes mammalis var. reticulata according to Foged (see text, reproduced with permission of E. Schweizerbart). 11. Achnanthes (Actinoneis) mammalis var. reticulata. 12. Unnamed individual in Schmidt et al. (1895, pl. 198, fig. 40). 13, 14. Cocconeis citrina. 15–17. Cocconeis citronella. 18. Cocconeis sabangi. 19, 20. Cocconeis trachyderma. 21, 22. Achnanthes schmidtii. 23, 24 Achnanthes schmidtii (reproduced with permission of E. Schweizerbart). Scale bars = 20 μm.
FIGURES 39–44. Achnanthes citronella. 39, 40 in Achnanthes citronella, A. trachyderma comb. nov. (Bacillariophyta) and allied taxa pertaining to the same morphological group
FIGURES 39–44. Achnanthes citronella. 39, 40. Large oblong-elliptic individuals with coarse SV striation. 41. Small-celled individual with dense SV striation (see text). 42. Slide 2202 from A. Mann collection labelled as 'C. citronella Mann nom. nov.'. 43. Slide 2201 from H.W. Henshaw collection labelled as 'C. citronella Mann nom. nov.'. 44. Slide 3905 from A. Mann collection labelled as 'C. citronella Mann 1/2 normal size'. Scale bars = 10 μm.
FIGURES 58–67. 58–61. Achnanthes apiculata comb. nov. 62–64 in Achnanthes citronella, A. trachyderma comb. nov. (Bacillariophyta) and allied taxa pertaining to the same morphological group
FIGURES 58–67. 58–61. Achnanthes apiculata comb. nov. 62–64. Achnanthes cf. mammalis. 65–67. Achnanthes obesa comb. nov. 58. Individual from BM 1753, note the SV oblong rectangular areolae (arrow) and the position of the underlying RV extended and narrow stauros (arrowheads). 59. Apical areolae (arrow). 60. Laciniate marginal striae around the stauros (arrows). 60, 61. RV strongly radiate striae (arrowheads). 62, 63. Individual from BM 2887 with biseriate SV striae (arrowheads). 62. Apices free of areolae. 64. RV striae strongly radiate, stauros extended and high, reaching half valve width. 65, 66. Individual from BM 2593. 67. Individual from BM 2736, note the lateral gibbosities. 65. SV rectangular areolae. 66. RV striae strongly bent on apices (arrowhead). 67. Butterfly RV stauros (arrowheads) and striae radiate and thin (arrow). Scale bars = 10 μm.
FIGURES 33–38. Achnanthes citronella. 33 in Achnanthes citronella, A. trachyderma comb. nov. (Bacillariophyta) and allied taxa pertaining to the same morphological group
FIGURES 33–38. Achnanthes citronella. 33. Details of the SV striation. 34. Type slide 43609. 35. RV central area with the short and high/thick stauros (arrowheads). 36. Marginal dense RV striae (arrowhead). 37. RV apex with curved striae regularly spaced. 38. SV apex lacking areolae. Scale bars = 10 μm.
FIGURES 52–57. Achnanthes trachyderma. Individuals from Society Archipelago, SEM. 52 in Achnanthes citronella, A. trachyderma comb. nov. (Bacillariophyta) and allied taxa pertaining to the same morphological group
FIGURES 52–57. Achnanthes trachyderma. Individuals from Society Archipelago, SEM. 52. RV external side with laciniate stauros reaching almost the margin. 53. RV internal side with the stauros marginally delineated by very short striae (arrow), low helictoglossa (arrowhead). 54. RV external side with large stauros (arrowheads). 55. Detail of the central area in internal side, with areola domed hymenes (arrowhead). 56. RV apex with strongly bent striae with a marginal row of larger areolae. 57. Terminal raphe fissure continuing on the mantle. Scale bars = 5 μm (Figs 52–54); 1 μm (Figs 55–57).
TABLE 1 in A new freshwater species Achnanthes licunese sp. nov. (Achnanthaceae, Bacillariophyta) from pebbles of Licun River, Shandong Province, China
<p><b>TABLE 1.</b> Comparison of morphological characteristics of <i>Acnanthes licunese sp.nov.</i> and closely related taxa.</p><table><tbody><tr><th>Species/feature</th><th>Dimension Length(µm)</th><th>Width(µm)</th><th>Valve outline</th><th>center</th><th>Apices</th><th>Striae in 10 µm on RV</th><th>Striae in 10 µm on ARV</th><th>Spines</th><th>Marginal ridge</th><th>Terminal orbiculi on ARV</th><th>Habitat</th><th>Sources</th></tr></tbody><tbody><tr><th><i>A. licunese sp.nov.</i></th><td>38.0–53.5</td><td>10.0–12.5</td><td>linear to linear-lanceolate</td><td>slightly constricted</td><td>obtuse</td><td>9–10</td><td>9–10</td><td>cone-shaped, distributed along the margin on the ARV</td><td>absent</td><td>absent</td><td>Freshwater</td><td>This study</td></tr><tr><th><i>A. secretitaeniata</i> K.Toyoda & Ji. Tanaka</th><td>18.0–67.0</td><td>9.0–13.0</td><td>lanceolate to linear-lanceolate</td><td>slightly constricted</td><td>broadly rounded</td><td>9–11</td><td>8–10</td><td>plate-like, at each apex</td><td>present</td><td>absent</td><td>Brackish water</td><td>Heudre <i>et al.</i>, 2020</td></tr><tr><th><i>A. sinaensis</i> (Hustedt) Levkov, Tofilovska & Wetzel</th><td>32.5–43.0</td><td>8.5–11.5</td><td>linear to linear-lanceolate</td><td>slightly broad</td><td>broadly rounded to trunctate</td><td>10–11</td><td>10–11</td><td>absent</td><td>present</td><td>present</td><td>Freshwater</td><td>Tofilovska <i>et al.</i>, 2014</td></tr><tr><th><i>A. prominula</i> Levkov & Tofilovska</th><td>18.5–43.0</td><td>8.5–10.5</td><td>linear-lanceolate or elliptic-lanceolate</td><td>slightly broad</td><td>attenuated and narrowly rounded</td><td>11–12</td><td>10–12</td><td>absent</td><td>present</td><td>present</td><td>Freshwater</td><td>Tofilovska <i>et al.</i>, 2014</td></tr><tr><th><i>A</i>. <i>coarctata</i> (Brébisson & Smith) Grunow</th><td>29.0–44.5</td><td>7.0–9.5</td><td>biundulate</td><td>constricted</td><td>attenuated and narrowly rounded or rostrate and rounded</td><td>12–14</td><td>12–14</td><td>absent</td><td>present</td><td>present</td><td>Freshwater</td><td>Tofilovska <i>et al.</i>, 2014</td></tr></tbody></table>
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