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16 results for “Gomphonema acuminatum”
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.
FIGURES 274–279. SEM. 274 in The diatom genus Gomphonema Ehrenberg in Lake Baikal. II. Revision of taxa from Gomphonema acuminatum and Gomphonema truncatum-capitatum complexes
FIGURES 274–279. SEM. 274. Gomphonema angusticephalum. External view of footpole, showing deflected distal raphe end bisecting bilobed pore field. Porelli are differentiated from C-shaped areolae. 275–279. Gomphonema laticollum. 275–278. External viws. 279. Internal view. 275, 276. Whole valve views showing outline of the valves. 277. Central area with undulate raphe dilated proximal raphe ends and round stigma opening evident. C-shaped areolae dominate the valve. 278. Headpole showing C-shaped areolae and hooked distal raphe end. 279. Valve view with central nodule, helictoglosae and note presence of pseudosepta. Scale bars = 1 μm in Fig. 274, 2 μm in Figs 277, 278; 5 μm in Figs 275, 276, 279.
FIGURES 228–255 in The diatom genus Gomphonema Ehrenberg in Lake Baikal. II. Revision of taxa from Gomphonema acuminatum and Gomphonema truncatum-capitatum complexes
FIGURES 228–255. LM. 228–236. Gomphonema capitatum. 237–243. Gomphonema microcapitatum sp. nov. Fig. 238 is of the holotype. 244–255. Gomphonema cf. capitatum. Scale bar = 10 μm.
FIGURES 46–87 in The diatom genus Gomphonema Ehrenberg in Lake Baikal. II. Revision of taxa from Gomphonema acuminatum and Gomphonema truncatum-capitatum complexes
FIGURES 46–87. LM. 46–75. Gomphonema pseudacuminatum sp. nov. Fig. 48 is of the holotype. 76–87. Gomphonema sp. Scale bar = 10 μm.
FIGURES 298–301. SEM. 298 in The diatom genus Gomphonema Ehrenberg in Lake Baikal. II. Revision of taxa from Gomphonema acuminatum and Gomphonema truncatum-capitatum complexes
FIGURES 298–301. SEM. 298. Gomphonema capitatum, external view, footpole with apical pore field restricted almost entirely to the valve mantle. Pore field bisected by deflected distal raph end. C–shaped areolae evident. 299–301. Gomphonema cf. capitatum, external views. 299. General valve view. 300. Headpole with distal raphe end deflected onto mantle. Striae with C-shaped areolae continue from valve all around the mantle. 301. Central area. Undulate raphe is distinct. Striae formed of C-shaped areolae. Scale bars = 2 μm in Figs 298, 300, 301; 5 μm in Fig. 299.
FIGURES 292–297. SEM. 292 in The diatom genus Gomphonema Ehrenberg in Lake Baikal. II. Revision of taxa from Gomphonema acuminatum and Gomphonema truncatum-capitatum complexes
FIGURES 292–297. SEM. 292. Gomphonema cf. truncatum. External views. Footpole, with deflected distal raphe end and apical pore field mostly on the valve mantle. Porelli are physically separated from and morphologically differentiated from C-shape areolae. 293. Valve view with undulate raphe and C-shaped areolae distinct. 294. Gomphonema paracapitatum sp. nov., external view. Girdle view showing wedge-shaped frustule and extension of striae from valve view onto mantle. 295–297. Gomphonema capitatum, external views. 295. General valve view. 296. Central area with distinct C-shaped areolae. Proximal raphe ends are dilated weakly. 297. Headpole, Cshaped areolae evident. Scale bars = 1 μm in Fig. 292; 5 μm in Figs 293, 294; 10 μm in Fig. 295; 2 μm in Figs 296, 297.
FIGURES 268–273. Gomphonema angusticephalum, external views. 268, 271. General valve views. 269, 273 in The diatom genus Gomphonema Ehrenberg in Lake Baikal. II. Revision of taxa from Gomphonema acuminatum and Gomphonema truncatum-capitatum complexes
FIGURES 268–273. Gomphonema angusticephalum, external views. 268, 271. General valve views. 269, 273. Central area with dilated proximal raphe ends and small, round stigma opening evident. 270, 272. Headpole, with distal raphe ends hooked onto valve mantle. Areolae appear C-shaped. Sclae bars = 5 μm in Figs 268, 271; 1 μm in Figs 269, 270, 272, 273.
FIGURES 1–24 in The diatom genus Gomphonema Ehrenberg in Lake Baikal. II. Revision of taxa from Gomphonema acuminatum and Gomphonema truncatum-capitatum complexes
FIGURES 1–24. LM. 1–21. Gomphonema acuminatum. 22–24. Gomphonema brebissonii. Scale bar = 10 μm.
FIGURES 25–45 in The diatom genus Gomphonema Ehrenberg in Lake Baikal. II. Revision of taxa from Gomphonema acuminatum and Gomphonema truncatum-capitatum complexes
FIGURES 25–45. Gomphonema acuminatum. LM. Scale bar = 10 μm.
FIGURES 119–166 in The diatom genus Gomphonema Ehrenberg in Lake Baikal. II. Revision of taxa from Gomphonema acuminatum and Gomphonema truncatum-capitatum complexes
FIGURES 119–166. LM. 119–166. Gomphonema angusticephalum. Scale bar = 10 μm.
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