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84 results for “Gomphonema”
Text-fig. 2. Cracked chrysophycean-cysts and nest-like accumulation of the pennate diatom Gomphonema bohemicum REICHELT et FRICKE 1902 embedded in a bituminous and clayish matrix, SEM-photograph, sample Sf (no number), seam 1 roof. in Siliceous Microfossils From The Oligocene Tripoli-Deposit Of Seifhennersdorf
Text-fig. 2. Cracked chrysophycean-cysts and nest-like accumulation of the pennate diatom Gomphonema bohemicum REICHELT et FRICKE 1902 embedded in a bituminous and clayish matrix, SEM-photograph, sample Sf (no number), seam 1 roof.
Figura 1 in Gomphonema Ehrenberg (Bacillariophyta) de córregos prístinos do Cerrado brasileiro
Figura 1. Localização dos pontos amostrais (círculos em preto) e as respectivas unidades de conservação (PNB = Parque Nacional de Brasília; PNCV = Parque Nacional da Chapada dos Veadeiros; PETR = Parque Estadual de Terra Ronca). CB = Córrego Bananal, C1 = Córrego 01, CE = Córrego Estiva, CSD = Córrego São Mateus depois da Caverna, CSA = Córrego São Mateus antes da caverna, CL = Córrego Lapa.
Figura 2-25 in Gomphonema Ehrenberg (Bacillariophyta) de córregos prístinos do Cerrado brasileiro
Figura 2-25. Gomphonema Ehrenberg de córregos prístinos do cerrado. 2-6. Gomphonema brasiliense subsp. pacificum. 7-9. Gomphonema gracile. 10,11. Gomphonema lagenula. 11-14. Gomphonema laticollum. 15. Gomphonema sp.1. 16, 17. Gomphonema pseudoaugur. 18, 19. Gomphonema pumilum. 20-22. Gomphonema sp.2. 23. Gomphonema sp. 3. 24, 25. Gomphonema sp. 4. Escalas: 10 μm.
FIGURES 27, 28 in Expended range of Gomphonema firmum (Bacillariophyceae), once considered a Lake Baikal endemic, with notes on the identity of G. lanceolatum var. maximum
FIGURES 27, 28: Gomphonema lanceolatum var. maximum, reproduced iconographs. Fig. 27. Micrograph from Proschkina-Lavrenko (1950: Fig. 5). Fig. 28. Line drawing from Poretzky and Sheshukova (1953: Fig. 10). Scale bar: 10 µm.
FIGURES 14–20 in Expended range of Gomphonema firmum (Bacillariophyceae), once considered a Lake Baikal endemic, with notes on the identity of G. lanceolatum var. maximum
FIGURES 14–20: Gomphonema firmum from Gyrgyntui, external views, SEM. Fig. 14. Frustules in valve (a) and girdle (b) views. Figs. 15, 16. Frustules from external view. Fig. 17. Headpole showing the marginal spine and plicate ribs along the junction of valve face and mantle (arrows). Fig. 18. Footpole showing terminal raphe fissure and bisected pore field, which is separated from the adjacent striae by transverse hyaline strip. Fig. 19. Detail of central portion of the valve showing proximal raphe endings, round stigma opening and scattered impressions. Fig. 20. Areolae with volate occlusions; areolae with more than one vola are indicated by arrows.
FIGURES 21–26 in Expended range of Gomphonema firmum (Bacillariophyceae), once considered a Lake Baikal endemic, with notes on the identity of G. lanceolatum var. maximum
FIGURES 21–26: Gomphonema firmum from Gyrgyntui, internal views, SEM. Fig. 21. Valve with cingulum consisting of two open valvocopulae. Fig. 22. Detail of central portion of the valve showing hemispherical central nodule, proximal raphe endings (black arrows) and slit-like stigma opening (white arrow), note the pattern of strongly silicified virgae and alveolae containing internal areolar openings. Fig. 23. Headpole showing pseudoseptum (black arrow) and distal raphe ending on helictoglossa (white arrow). Fig. 24. Footpole showing pseudoseptum (black arrow) that masks apical pore field, distal raphe ending on helictoglossa (white arrow), note very small, hardly recognizable paired stubs (small white arrows). Fig. 25. Headpole, valvocopula with septum, which masks helictoglossa (white arrow). Fig. 26. Footpole, valvocopula with septum, note porelli of the bisected pore field (arrows).
FIGURES 1–13 in Expended range of Gomphonema firmum (Bacillariophyceae), once considered a Lake Baikal endemic, with notes on the identity of G. lanceolatum var. maximum
FIGURES 1–13: Gomphonema firmum from Gyrgyntui, valve view, LM. Size diminution series including specimens shorter than previously described. Scale bar: 10 µm.
FIGURES 22–27 in Gomphonema supersaprophilum sp. nov., a new diatom species (Gomphonemataceae, Bacillariophyceae) from Flemish rivers (Belgium)
FIGURES 22–27. Gomphonema supersaprophilum Van de Vijver & E.Reichardt, sp. nov. SEM images taken from the holotype sample (BR-4831, Devebeek, Ingelmunster, Wet-Vlaanderen, Belgium, sample APM23-73). 22. SEM external view of an entire valve in oblique view showing the valve mantle. 23. SEM external detail of the central area showing the isolated pore (arrow) and the slit-like areolae. 24. SEM external detail of the footpole with the apical pore field bisected by the terminal raphe fissure. 25. SEM internal view of an entire valve. 26. SEM internal detail of the central area showing the isolated pore (arrow) and the hooked central raphe endings. Note the reduced silica struts. 27.SEM internal detail of the footpole with the helictoglossa. Scale bars = 10 µm (Figs 22, 25) = 1 µm (Figs 23, 24, 26, 27).
FIGURES 17–20 in Gomphonema beaugerianum, a new Gomphonema species (Bacillariophyta) found in a historic William Smith sample from the Auvergne (France)
FIGURES 17–20. Gomphonema beaugerianum Van de Vijver, sp. nov. LM and SEM images taken from the holotype sample (BR-4847, Lac de Guéry, Auvergne, France, sample W. Smith). 17. SEM external view of an entire valve in oblique view showing the valve mantle. 18. SEM external detail of the central area showing the isolated pore and the depressed areolae with the reniform siliceous flaps. Note also the shallow depressions in the axial area. 19. SEM internal view of an entire valve. 26. SEM internal detail of the central area showing the slit-like isolated pore and the hooked central raphe endings. Note the absence of silica struts separating the areolae. Scale bars = 10 µm (Figs 17–19) = 1 µm (Fig. 20).
FIGURES 1–16 in Gomphonema beaugerianum, a new Gomphonema species (Bacillariophyta) found in a historic William Smith sample from the Auvergne (France)
FIGURES 1–16. Gomphonema beaugerianum Van de Vijver, sp. nov. LM and SEM images taken from the holotype sample (BR-4847, Lac de Guéry, Auvergne, France, sample W. Smith). 1. LM view of a frustule in girdle view. 2–15. LM views of the population arranged in decreasing length. 16. SEM external view of an entire valve. Scale bars = 10 µm.
FIGURES 15–34 in Two new species of the genus Gomphonema (Bacillariophyceae) from Guayabo Waterfall, Cuba
FIGURES 15–34. Gomphonema curatorum sp. nov. LM and SEM images from the type population. 15–27. LM images. 15. Initial valve. 18. Holotype specimen. 27. Girdle view. 28–34. SEM images. 28. Internal view of an entire valve. 29. External view of an entire frustule, tilted 40°. 30. External view of footpole with pore field. 31. Internal view of valve centre showing alveoli without stubs or struts and curved proximal raphe fissures. 32. External view of the central part of a valve tilted 40° showing foramina and depressions near the central raphe endings. 33. External view of the central part of a valve lacking depressions in the central area. 34. External view of headpole, foramina at the border of the axial area strongly C-shaped. Scale bar (SEM) = 2 μm, except Figs. 28 & 29, scale bar = 10 μm.
FIGURES 9–14 in Two new species of the genus Gomphonema (Bacillariophyceae) from Guayabo Waterfall, Cuba
FIGURES 9–14. Gomphonema guayabense sp. nov. SEM images from the type population. 9. External view of the central part of a valve with the central raphe endings. 10. External view showing foramina on valve mantle, small granula on the interstriae at the junction of valve mantle/face and the otherwise unornamented mantle. 11. Internal view of an entire valve with pseudosepta at both poles. 12. External view of foramina on valve face and granula at the junction of valve face/mantle. 13. External view of footpole with pore field, tilted 40°. 14. Internal view of valve centre showing alveoli, central nodule and proximal raphe fissures. Scale bar = 2 μm, except Figs. 9 & 11, scale bar = 10 μm.
FIGURES 1–8 in Two new species of the genus Gomphonema (Bacillariophyceae) from Guayabo Waterfall, Cuba
FIGURES 1–8. Gomphonema guayabense sp. nov. LM images from the type population. 1. Holotype specimen. 8. Girdle view.
FIGURES 281–285. SEM. 280–281. Gomphonema laticollum, internal views. 280 in The diatom genus Gomphonema Ehrenberg in Lake Baikal. II. Revision of taxa from Gomphonema acuminatum and Gomphonema truncatum-capitatum complexes
FIGURES 281–285. SEM. 280–281. Gomphonema laticollum, internal views. 280. Footpole, raphe terminating in helictoglossa. There is a pseudoseptum present. 282–285. Gomphonema microlaticollum sp. nov., external views. 282, 284. Whole valve views. 283, 285. Central areas with biseriate striae, round stigma opening and dilated proximal raphe ends evident. Scale bars = 1 μm in Figs 280, 281, 283, 285; 2 μm in Figs 282, 284.
FIGURES 187–227 in The diatom genus Gomphonema Ehrenberg in Lake Baikal. II. Revision of taxa from Gomphonema acuminatum and Gomphonema truncatum-capitatum complexes
FIGURES 187–227. LM. 191–213. Gomphonema cf. truncatum. 214–227. Gomphonema paracapitatum sp. nov. Fig. 214 is of the holotype. Scale bar = 10 μm.
FIGURES 286–291. SEM. 286–288 in The diatom genus Gomphonema Ehrenberg in Lake Baikal. II. Revision of taxa from Gomphonema acuminatum and Gomphonema truncatum-capitatum complexes
FIGURES 286–291. SEM. 286–288. Gomphonema microlaticollum sp. nov. Internal views. 286. Whole valve view showing outline. 287. Headpole with helictoglossa and narrow pseudoseptum present. 288. Footpole showing offset helictoglossa and pseudoseptum. 289–291. Gomphonema cf. truncatum, external views. 289. Whole valve view. 290. Central area. Biseriate striae become uniseriate near the axial area. Areolae are C-shaped. Dilated proximal raphe ends and small, round stigma opening are evident. Raphe is undulate. 291. Headpole with striae and deflected distal raphe end evident. Scale bars = 5 μm in Figs 286, 289; 1 μm in Fig. 287; 0.5 μm in Fig. 288; 2 μm in Figs 290, 291.
FIGURES 262–267. SEM. 262–267 in The diatom genus Gomphonema Ehrenberg in Lake Baikal. II. Revision of taxa from Gomphonema acuminatum and Gomphonema truncatum-capitatum complexes
FIGURES 262–267. SEM. 262–267. Gomphonema pseudacuminatum sp. nov., external views. 262, 267. Headpole with distal raph branch deflected onto mantle. 263, 266. Footpole with apical pore fields almost entirely on mantle. Porelli of the bilobed pore field are differentiated from C-shaped areolae. 264. General valve view showing outline of valve. 265. Central area. Proximal raphe ends are straight and stigma opening is small, elliptical. Areolae are C-shaped. Scale bars = 5 μm in Fig. 264, 1 μm for Figs 262, 263, 265–267.
FIGURES 167–186 in The diatom genus Gomphonema Ehrenberg in Lake Baikal. II. Revision of taxa from Gomphonema acuminatum and Gomphonema truncatum-capitatum complexes
FIGURES 167–186. LM. 167–175. Gomphonema laticollum. 176–190. Gomphonema microlaticollum sp. nov. Fig. 178 is of the holotype. Scale bar = 10 μm.
FIGURES 88–118 in The diatom genus Gomphonema Ehrenberg in Lake Baikal. II. Revision of taxa from Gomphonema acuminatum and Gomphonema truncatum-capitatum complexes
FIGURES 88–118. LM. 88–106. Gomphonema pseudopusillum. 107–118. Gomphonema cf. pseudopusillum. Scale bar = 10 μm.
FIGURES 256–261. SEM. 256–261. Gomphonema acuminatum. External views. 256 in The diatom genus Gomphonema Ehrenberg in Lake Baikal. II. Revision of taxa from Gomphonema acuminatum and Gomphonema truncatum-capitatum complexes
FIGURES 256–261. SEM. 256–261. Gomphonema acuminatum. External views. 256. External view of central area to headpole. Proximal and distal ends evident. 266. Central area with dilated proximal raphe ends and small, round stigma opening evident. 258. Headpole showing protracted apex and hooked distal raphe end. 259. Footpole with deflected distal raphe end bisecting apical pore field on the valve mantle. 260, 261. Gomphonema pseudacuminatum sp. nov., external views. 260. Entire valve view showing valve proportions. 261. Central area with dilated proximal raphe ends, small elliptical stigma opening and occlusion of areolae resulting in C-shaped openings. Scale bars = 5 μm in Figs 256, 260, 2 μm in Fig. 258, 1 μm in Figs 257, 259, 261.
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