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27 results for “Hantzschia”
FIGURES 51–65. Hantzschia amphioxys f in Three new Hantzschia species (Bacillariophyta) from the Maritime Antarctic Region
FIGURES 51–65. Hantzschia amphioxys f. muelleri. LM and SEM observations of a population from Livingston Island (sample LIV- 16A). Figs 51–61. Light micrographs showing a reduction in valve length. Fig. 62. External view of an entire valve showing the thickened ventral hyaline border with scattered areolae. Fig. 63. External detail of the central area with the deflected, interrupted proximal raphe endings. Fig. 64. Internal detail of the central area with the thickened central nodule. Proximal raphe endings are not clearly discernible. Fig. 65. Internal view of an entire valve showing the irregularly placed fibulae. Scale bar represents 10 μm except for figs 63 & 64 where scale bar = 1 μm.
FIGURES 66–76 in Three new Hantzschia species (Bacillariophyta) from the Maritime Antarctic Region
FIGURES 66–76. Hantzschia abundans. LM and SEM observations of a population from James Ross Island (sample S1E). Figs 66–73. Light micrographs showing a reduction in valve length. Fig. 74. External view of an entire valve showing the very narrow ventral hyaline border and striae composed of rounded areolae. Fig. 75. External detail of the central area with the straight, interrupted, proximal raphe endings. Note the striae that are weakly depressed near the ventral area. Fig. 76. Internal detail of the central area with the interrupted proximal raphe endings. Scale bar represents 10 μm except for figs 75 & 76 where scale bar = 1 μm.
FIGURES 1–6 in Three new Hantzschia species (Bacillariophyta) from the Maritime Antarctic Region
FIGURES 1–6. Hantzschia australabundans. Light micrographs (LM) of the type population (Livingston Island, Byers Peninsula, sample LIV-BY16A). Scale bar represents 10 μm.
FIGURES 77–89 in Three new Hantzschia species (Bacillariophyta) from the Maritime Antarctic Region
FIGURES 77–89. Hantzschia incognita. LM and SEM observations of the type population (Livingston Island, Hurd Peninsula, sample Π1a). Figs 77–85. Light micrographs showing a rather limited morphological variability. Fig. 86. External view of an entire valve showing the thickened ventral hyaline border and the grooves with the striae. Fig. 87. External detail of the central area with the continuous proximal raphe endings and the deep stria grooves. Fig. 88. Internal detail of the central area with the continuous proximal raphe endings. Fig. 89. Internal view of an entire valve showing the irregularly placed fibulae. Scale bar represents 10 μm except for figs 87 & 88 where scale bar = 1 μm.
FIGURE 90 in Three new Hantzschia species (Bacillariophyta) from the Maritime Antarctic Region
FIGURE 90. Diagram representing length vs. width for several H. abundans populations worldwide based on literature data for the populations from Mongolia, Uruguay, Sardinia and Germany (type population). (JRI=James Ross Island, M2=Vega Island, LIV=Livingston Island).
FIGURES 35–50 in Three new Hantzschia species (Bacillariophyta) from the Maritime Antarctic Region
FIGURES 35–50. Hantzschia amphioxys. LM and SEM observations of a population from James Ross Island (sample Anna Pool). Figs 35–46. Light micrographs showing a reduction in valve length. Fig. 47. External view of an entire valve showing the irregular, narrow ventral hyaline border. Fig. 48. External detail of the central area with the deflected, interrupted proximal raphe endings. Fig. 49. Internal detail of the central area with the interrupted, deflected proximal raphe endings. The arrows indicate the small silica bars separating the areolae. Fig. 50. Internal view of an entire valve showing the irregularly placed fibulae. Scale bar represents 10 μm except for figs 48 & 49 where scale bar = 1 μm.
FIGURES 22–34 in Three new Hantzschia species (Bacillariophyta) from the Maritime Antarctic Region
FIGURES 22–34. Hantzschia zikmundiana. LM and SEM observations of the type population (Vega Island, sample VEGA-M2). Figs 22–30. Light micrographs showing a reduction in valve length. Fig. 31. External view of an entire valve showing the narrow ventral hyaline border and the shallow grooves with the rounded areolae. Fig. 32. External detail of the central area with the straight, interrupted, proximal raphe endings. Fig. 33. Internal detail of the central area with the interrupted proximal raphe endings. Fig. 34. Internal view of an entire valve showing the irregularly placed fibulae. Scale bar represents 10 μm except for figs 32 & 33 where scale bar = 1 μm.
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