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28 results for “Aulacoseira”
Text-fig. 5. Scattered valves of Aulacoseira distans (EHRENBERG) SIMONSEN 1979, cracked valves of Ellerbeckia arenaria (MOORE) CRAWFORD 1988 and Tetracyclus ellipticus (EHRENBERG) GRUNOW 1862 as well as broken scleres of freshwater sponges (on the right hand) are lying in a clayish matrix. SEM-photograph, sample Sf 380, seam 4. in Siliceous Microfossils From The Oligocene Tripoli-Deposit Of Seifhennersdorf
Text-fig. 5. Scattered valves of Aulacoseira distans (EHRENBERG) SIMONSEN 1979, cracked valves of Ellerbeckia arenaria (MOORE) CRAWFORD 1988 and Tetracyclus ellipticus (EHRENBERG) GRUNOW 1862 as well as broken scleres of freshwater sponges (on the right hand) are lying in a clayish matrix. SEM-photograph, sample Sf 380, seam 4.
FIGURES 20–25 in Aulacoseira principissa sp. nov., a new 'centric' diatom species from the sub- Antarctic region
FIGURES 20–25: SEM images of Aulacoseira principissa. All pictures taken from the holotype population (sample BW390). Fig. 20: Valve view of a linking valve with marginal ring of spines and regular areolae pattern. Fig. 21: Valve view of a linking valve with marginal ring of spines but irregular areolae pattern showing only open areolae near the valve margin. Fig. 22: Separation valve lacking linking spines. Fig. 23: Inside view with the narrow Ringleiste. Fig. 24: Detail of a broken valve part with the Ringleiste and the (eroded) rimoportula (see arrow). Fig. 25: Detail of a fragment showing vela from the inside. Scale bars represent 1 µm.
FIGURES 15–19 in Aulacoseira principissa sp. nov., a new 'centric' diatom species from the sub- Antarctic region
FIGURES 15–19: SEM images of Aulacoseira principissa. All pictures taken from the holotype population (sample BW390). Fig. 15: Chain of two entire frustules showing the linking spines, parts of the girdle bands and Ringleiste. Fig. 16: Frustule still enclosed in the (eroded) girdle bands. Note the fine pores in the girdle. Fig. 17: Two valves linked with bifurcated linking spines. Fig. 18: Valve showing linking spines, absence of sulcus (see arrow), parallel striae with rounded to square areolae and mantle plaques. Fig. 19: Detail of valve mantle with plaques. Scale bar represents 1 µm except for Fig. 15 where scale bar = 10 µm.
FIGURES 2–14 in Aulacoseira principissa sp. nov., a new 'centric' diatom species from the sub- Antarctic region
FIGURES 2–14: LM images of Aulacoseira principissa. All pictures taken from the holotype population (sample BW390). Figs 2–4 show girdle views whereas Figs 5–14 show valve views. Fig. 2: Chain of six entire frustules and two valves in girdle view, with clearly visible pervalvar striae. Fig. 3: Girdle view with cross-section focus. Fig. 4: Chain of two entire frustules and one valve. Figs 5–11: Decreasing size range of valve views. Note the irregular areola pattern in Figs 9–11. Figs 12–13: Valve views showing the Ringleiste. Fig. 14: Photograph taken using the method explained in Houk & Klee (2007) showing the possible position of the rimoportula (rp?). Scale bars represent 10 µm.
FIGURE 1 in Aulacoseira principissa sp. nov., a new 'centric' diatom species from the sub- Antarctic region
FIGURE 1. The Antarctic region with the location of the islands and archipelagos where Aulacoseira principissa was found. Macquarie Island, in the southern Pacific Ocean where the species might have been observed too is lacking.
FIGURE 69 in Aulacoseira huguang sp. nov., a new Lateglacial fossil diatom from South China
FIGURE 69. Variation in the relative abundances of A. huguang, A. granulata,A. Ambigua, D. stelligera and Lindavia balatonis in the sediment sequence from Huguangyan Maar lake for the period spanning the Lateglacial from 10,000 to 17,000 years ago. The ages are reported in calibrated kilo-anni before present (cal. ka BP). The asterisk (*) indicates the position of the sample selected as type material for A. huguang sp. nov.
FIGURES 2–55 in Aulacoseira huguang sp. nov., a new Lateglacial fossil diatom from South China
FIGURES 2–55. LM images of Aulacoseira huguang sp. nov., taken from the holotype population (sample HGY-A5-189) under bright field and DIC (except for Figs 10–11, taken under phase contrast). 2–25. Valve views, each specimen is seen under two different focus plans. 26–31. Girdle views of single valves showing the range in mantle height. 32–51. Girdle views of complete frustules, each specimen seen under two or three different focus plans. 54–55. Short chain composed of two frustules in girdle view. Scale bar = 5 µm. Figs 45–47 correspond to the holotype specimen.
FIGURE 68 in Aulacoseira huguang sp. nov., a new Lateglacial fossil diatom from South China
FIGURE 68. Relationship between diameter and mantle height in Aulacoseira huguang and similar species of Aulacoseira. The list of the images derived from the literature is given in Table 2.
FIGURE 1 in Aulacoseira huguang sp. nov., a new Lateglacial fossil diatom from South China
FIGURE 1. Geographical position of the Huguangyan maar lake in southeast China (a) and bathymetric map of its basin (b). The yellow star indicates the coring location from which the material investigated in this study was retrieved.
FIGURES 56–67 in Aulacoseira huguang sp. nov., a new Lateglacial fossil diatom from South China
FIGURES 56–67. SEM images of Aulacoseira huguang, taken from the holotype population (sample HGY-A5-189) Fig. 56. Oblique view of a single valve showing from the top to the bottom of the valve: the row of spines that occurs around the circumference of the valve face, the pervalvar rows of areolae slightly dextrorse, the smooth collum with tiny nodules, the ringleist, projecting deep into the valve interior. Fig. 57. Mantle view of a single valve showing the pervalvar rows of areolae slightly dextrorse, the smooth collum with tiny nodules and external opening of one rimoportula (arrow). Fig. 58. Oblique view of a complete frustule, showing the pervalvar rows of areolae slightly dextrorse, the smooth collum with tiny nodules and external opening of one rimoportula (arrow). Fig. 59. Oblique view showing the valve face with evenly spaced areolae, decreasing in size from the edges to the centre of the valve. An areola is positioned between each spine. Figs 60–62. External views of partly corroded valves showing round areolae of various size. Fig. 63. Ringleist view. Fig. 64. Girdle view showing conical spines, stout at the base and bluntly rounded at the tip, raised from two ribs on the mantle. Siliceous nodules are visible on the collum at the basis of each rib, with more nodules on the ribs. Fig. 65. Internal view of a broken valve. The internal opening of one rimoportula (arrow) is visible on the ringleist. Fig. 66. External view of a broken frustule. In the broken valve, both rimoportulae are visible. They are placed in opposite positions on the perimeter of the valve (arrows). Fig. 67. Internal view of a broken valve showing the internal openings of two rimoportulae (arrows) which are visible on the ringleist. The two rimoportulae are placed in opposite positions on the perimeter of the valve. Scale bars = 3µm.
FIGURE 9 in Three novel species of Bacillariophyta (Diatoms) belonging to Aulacoseira and Lindavia from the Pliocene Hadar Formation, Afar Depression of Ethiopia
FIGURE 9. Scanning electron micrographs of Aulacoseira helianthus (left) and A. agassizii var. malayensis (right). Note the spine morphology originating from two mantle costae, location of the separation furrow in relation to the separation spine, and spine distribution.
FIGURE 5 in Three novel species of Bacillariophyta (Diatoms) belonging to Aulacoseira and Lindavia from the Pliocene Hadar Formation, Afar Depression of Ethiopia
FIGURE 5. Diminution size reduction series pictures of A. jewsonii taken at two focal heights to examine the diameter accurately (A–C, E–G). Three valves in a filament (D, H) the top valve is a separation valve while the bottom two are linking valves. The holotype is shown at different focal heights (I–L).
FIGURE 8 in Three novel species of Bacillariophyta (Diatoms) belonging to Aulacoseira and Lindavia from the Pliocene Hadar Formation, Afar Depression of Ethiopia
FIGURE 8. Scanning electron micrographs of L. cohenii. Central fultoportula arrowed (A, B). A heavily dissolved specimen (C). Isometric view of a well preserved specimen exhibiting transverse undulation, spinules arrowed (D).
FIGURE 6 in Three novel species of Bacillariophyta (Diatoms) belonging to Aulacoseira and Lindavia from the Pliocene Hadar Formation, Afar Depression of Ethiopia
FIGURE 6. Scanning electron micrographs of A. jewsonii. Spatulate linking spines of two internal sister valves (A). Note the doubly punctate areolae that is typical of internal valves (E). Spatulate linking spines are also present on linking valves (B) that sometimes exhibit twisting costae (C). A filament of two frustules, one contains a separation valve (C) (far left), and a linking valve (middle left), the frustules on right contains two linking valves. A well preserved separation valve (D). Sister internal valves held together by spatulate linking spines (E). A single internal valve (F). A single separation valve (G).
FIGURE 3 in Three novel species of Bacillariophyta (Diatoms) belonging to Aulacoseira and Lindavia from the Pliocene Hadar Formation, Afar Depression of Ethiopia
FIGURE 3. Size diminution series of A. helianthus (A–L). Holotype shown (B). Ringleiste view (A, L). Scale bars are 10 μm throughout.
FIGURE 4 in Three novel species of Bacillariophyta (Diatoms) belonging to Aulacoseira and Lindavia from the Pliocene Hadar Formation, Afar Depression of Ethiopia
FIGURE 4. Scanning electron micrographs of A. helianthus. (A)Valve view of a separation valve. Note the separation furrow (arrowed). A linking valve (B) in valve view lacks separation spines and furrows. Internal view of two separation valves (C) two thickened costae are the internal structure of the separation furrow (arrowed). Two linking valves lacking separation spines (D). A filament of A. helianthus with separation furrow arrowed (E). Fimbria attach the two valves of the frustule (E), arrowed.
FIGURE 2 in Three novel species of Bacillariophyta (Diatoms) belonging to Aulacoseira and Lindavia from the Pliocene Hadar Formation, Afar Depression of Ethiopia
FIGURE 2. Simplified lithology of the NAO and NAW drill cores. NAO14-1B/1D is a composite of NAO14-1B with gaps filled in by NAO14-1D. A tephrostratigraphic tie point correlates NAO with NAW at ~75 mbs and ~50 mbs, respectively. Diatom presence from initial 32 cm sampling
FIGURES 2–22 in Aulacoseira veraluciae sp. nov. (Coscinodiscophyceae, Aulacoseiraceae): a common freshwater diatom from Brazil
FIGURES 2–22. Aulacoseira veraluciae, LM. Scale: 10 µm. Figs 2, 3. Initial cells. Figs 4, 5. Valve view of the separation cells. Figs 6, 7. Valve view of the linking cells. Fig. 8. View of the cell lumen showing the ringleiste. Figs 9‒22. Aspect of the chains.
FIGURE 1 in Aulacoseira veraluciae sp. nov. (Coscinodiscophyceae, Aulacoseiraceae): a common freshwater diatom from Brazil
FIGURE 1. Location of the sampling sites of Aulacoseira veraluciae on different Brazilian geographic regions.
FIGURES 30–35 in Aulacoseira veraluciae sp. nov. (Coscinodiscophyceae, Aulacoseiraceae): a common freshwater diatom from Brazil
FIGURES 30–35. Aulacoseira veraluciae, SEM. Scales: 2 µm (Figs 30, 31, 34), 1 µm (Figs 32, 33, 35). Figs 30, 31. External rimoportulae openings (arrows) in the separation and linking valves, respectively. Fig. 32. Internal rimoportula opening (arrow) near the valve face/ mantle junction in the separation valve. Fig. 33. Internal rimoportulae openings (arrows) on the ringleist. Fig. 34. Detail of ringleiste. Fig. 35. Aspect of the girdle bands. Note the fimbriate valvocopula (arrow).
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