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27 results for “Cyclotella”
FIGURE 1 in Towards a phylogenetic classification of species belonging to the diatom genus Cyclotella (Bacillariophyceae): Transfer of species formerly placed in Puncticulata, Handmannia, Pliocaenicus and Cyclotella to the genus Lindavia
FIGURE 1. Diagramatic representation of the arrangement of key morphological features in Cyclotella and related genera. Cyclotella sensu stricto (upper right) have a rimoportula within the ring of marginal fultoportulae and located on a costa. In Discostella (upper left), the rimoportula is also located within the ring of marginal fultoportulae, and both types of processes are located between costae. In Tertiarius (lower right), the internal opening of the rimoportula is positioned laterally on a fultoportula-bearing costa (typically, see text). Lindavia (lower left) has the synapomorphic condition that both the internal and external openings of the rimoportula are on the valve face. VM = valve mantle, C = costae, LP = rimoportula (labiate process), SP = fultoportula (strutted process).
FIGURES 34–39 in Cyclotella petenensis and Cyclotella cassandrae, two new fossil diatoms from Pleistocene sediments of Lake Petén-Itzá, Guatemala, Central America
FIGURES 34–39. Type material of fossil lacustrine diatom Cyclotella cassandrae from lake Peten Itza, SEM. (34) Internal view of the valve margin along the major axis, MFP consisting of a short tube surrounded by three cowlings and located just at the tip of the costa below the marginal lamina. (35) Internal view of the valve margin along the minor axis where MFP are rather embedded in the costae at some distance of the marginal lamina and with triangular-shaped inserted costae. (36) Oblique internal view of a broken valve showing MFP on nearly each costae, a single short costa-born RM and CFP consisting of a tube with two to three cowlings scattered indifferently on the convex and concave part of the central area. (37) Born on a costa, a detailed view of the RM consisting of a shortly stalked labium with a radially orientated slit. (38) External view of a complete corroded frustule where the two valves are attached by an open valvocopula (black arrowhead) and fragments of collapsed and eroded girdle bands. (39) Internal view of a valve with a large fragment of a stepped valvocopula, a broken RM (black arrowhead) and CFP consisting of one tube with two or three cowlings. Scale = 10μm (38–39), 2μm (36), 1μm (34–35), 500 nm (37). Abbreviations: central fultoportulae (CFP), marginal fultoportulae (MFP), rimoportula (RM).
FIGURES 23–27 in Cyclotella petenensis and Cyclotella cassandrae, two new fossil diatoms from Pleistocene sediments of Lake Petén-Itzá, Guatemala, Central America
FIGURES 23–27. Type material of fossil lacustrine diatom Cyclotella cassandrae from lake Peten Itza, LM. (23–24) Valve view at two different focus showing the elliptic shape of the valve, the slightly tangentially undulated central area with scattered puncta, short striae along the major axis, longer and apart striae along the minor axis and at some distance of the valve margin the external opening of MFP (black arrowheads). (25). Valve view with dichotomous striae along the minor axis. (26–27). Size variation of C. cassandrae: large specimen with dichotomous striae and a central area occupied by a scattered ring of puncta, some specimen are more rounded but still elliptic. Scale = 10μm. Abbreviation: central fultoportulae (CFP), marginal fultoportulae (MFP), rimoportula (RM).
FIGURES 17‒22 in Cyclotella petenensis and Cyclotella cassandrae, two new fossil diatoms from Pleistocene sediments of Lake Petén-Itzá, Guatemala, Central America
FIGURES 17‒22. Type material of fossil lacustrine diatom Cyclotella petenensis from lake Peten Itza, SEM. (17) Internal view of the valve showing near the margins partially occluded alveoli by the central lamina, an arc of CFP (white arrowheads) consisting of one tube surrounded by three satellite pori in the central area and a single sessile RM (white double arrowhead) opposite to the arc. (18) Internal detailed view of the valve margin with MFP located on each costae and a stalked rimoportula with slightly deflected labium. (19) Internal view of costae-born MFP consisting of a tube surrounded by three satellite pores and the protruding RM with an oblique slit. (20) External view of the external openings of marginal fultoportula (white arrowhead) consisting of very short tubes separated by rows of very fine areolae and granules. (21) Detailed view of a broken valve margin showing a narrow canal connecting internal MFP to their external opening. (22) External view of two valves connected by a cingulum consisting of an open valvocopula (white arrowhead) and several copulae. Scale = 10μm (17, 22), 2μm (18–21). Abbreviations: central fultoportulae (CFP), marginal fultoportulae (MFP), rimoportula (RM).
FIGURES 1‒9 in Cyclotella petenensis and Cyclotella cassandrae, two new fossil diatoms from Pleistocene sediments of Lake Petén-Itzá, Guatemala, Central America
FIGURES 1‒9. Type material of fossil lacustrine diatom Cyclotella petenensis from lake Peten Itza, LM. (1‒2) Valve view at two different focus showing striae and marginal alveoli representing the 'shadow line' and the tangentially undulated central area with CFP in an arc. (3–9) Size variation of C. petenensis with variable number of CFP related to valve diameter. (4) taken from holotype permanent slide PC0612192. Scale bar = 10μm. Abbreviations. central fultoportulae (CFP).
FIGURES 11‒16 in Cyclotella petenensis and Cyclotella cassandrae, two new fossil diatoms from Pleistocene sediments of Lake Petén-Itzá, Guatemala, Central America
FIGURES 11‒16. Type material of fossil lacustrine diatom Cyclotella petenensis from lake Peten Itza, SEM. (11) External view of the valve face with a small central area and CFP positionned in an arc (white arrowheads), striae crossed by a 'shadow line' corresponding to the centripetal occlusion of the alveoli by the central lamina. (12) Oblique view of the valve showing two bands of the cingulum (white arrow). (13) Eroded part of the marginal area showing the limit between the central lamina and alveoli openings, erected ribs (costae) covered by the perforated silica layer with large areolae near the central area. (14) Side view of the valve with a gently sloping mantle, the dashed lines represent the interstriae/costae in depressions whereas the mid-part of striae is slightly elevated. (15) Details of striation near the valve margin (white arrows and dashed lines delineated the ribs), each striae being formed by two lateral rows of areolae separated by a narrow row of very fine areolae. (16) Detailed view of striation (dashed lines delineated the ribs): near the valve centre above the ribs rows of four to five large areolae separated by hyaline strips perforated by very fine areolae, on the valve face the rows of large areolae dividing up in two rows of smaller areolae arranged in quiqunx, the striae (between dashed lines) formed by two lateral rows of medium sized areolae separated by a finely perforated hyaline strip. Halfway the mantle the external openings of MFP (white arrowhead) and a larger rounded opening (double white arrowhead) representing the external expression of the RM slightly above the ring of MFP. Below the ring of external openings (MFP and RM) four to five rows of granules up to the valve margin. Scale = 10μm (11 ‒12), 5μm (14), 2μm (13, 15–16). Abbreviations. central fultoportulae (CFP), marginal fultoportulae (MFP), rimoportula (RM).
FIGURES 1–22 in Cyclotella deceusteriana, a new centric diatom species (Bacillariophyta) from the sub-Antarctic Region
FIGURES 1–22. Cyclotella deceusteriana Van de Vijver & Dessein sp. nov. Figures 1–14 taken from the Iles Kerguelen type population (sample BW424), figs 15–22 taken from the Ile de la Possession (Crozet Archipelago) population (sample BW513). Figs 1–22. LM photographs of valves in diminishing size range. Note the different number of central fultoportulae related to a decreasing valve diameter. The arrows indicate the marginal fultoportulae. Scale bar represents 10 μm.
FIGURES 23–29 in Cyclotella deceusteriana, a new centric diatom species (Bacillariophyta) from the sub-Antarctic Region
FIGURES 23–29. Cyclotella deceusteriana Van de Vijver & Dessein sp. nov. All SEM pictures taken from the Iles Kerguelen type population (sample BW424). Fig. 23. External scanning electron microscopy image of an entire valve showing the smooth, flat central area, the central fultoportulae, the undulating marginal structure, the marginal spines and the marginal fultoportulae. The arrows indicate the marginal depressions, split in several small, rounded pores. Figs 24–26. External views of several valves showing a variable number of central fultoportulae, the variability within the marginal spines and the clearly smooth central area. Fig. 27. Internal SEM image of an entire valve showing the smooth, flat central area, the marginal fultoportulae located on each costa, the rimoportula and the central marginal fultoportulae. The arrows indicate unbroken spines. Fig. 28. SEM external detail of the marginal part of a valve showing clearly the spines, the openings of the marginal fultoportulae (double-headed arrows) and the hyaline furrows between the raised striae (arrows). Fig. 29. Internal SEM detail of the rimoportulae and several costae bearing marginal fultoportulae. Note also the very finely areolated striae between the costae. Scale bar represents, 5 μm for figs 24–26 and 1 μm for figs 23, 27–29.
FIGURES 2–19 in Cyclotella horstii sp. nov. (Bacillariophyta) from Ivankovskoe reservoir (Volga reservoirs, Russia)
FIGURES 2–19: Cyclotella horstii sp. nov. Figs 2–18: Valve view. Fig. 19: External view of initial valve (1–16: LM; 17–19: SEM). Scale bars = 10 µm.
FIGURES 26–34 in Cyclotella horstii sp. nov. (Bacillariophyta) from Ivankovskoe reservoir (Volga reservoirs, Russia)
FIGURES 26–34: Cyclotella horstii sp. nov. SEM images, all internal views. Figs 26–32: Internal view of valve. Fig. 32: part of internal view of valve, white arrows indicates marginal fultoportulae. Fig. 33: Internal view of initial valve. Fig. 34: Internal view of part of initial valve, white arrow indicates marginal furtoportulae, black arrow indicates rimoportula. Scale bars = 10 µm (Figs 26–31, 33, 34), = 1 µm (Fig. 32).
FIGURES 70–71 in Morphology of some fossil lacustrine centric species from the western United States assigned to the genus Cyclotella (Bacillariophyta), including four described as new
FIGURES 70–71: Cyclotella jonesii. LM. Figure 70 is of Morphotype 1. Figure 71 is of Morphotype 2. Scale bars = 10 µm.
FIGURES 64–69 in Morphology of some fossil lacustrine centric species from the western United States assigned to the genus Cyclotella (Bacillariophyta), including four described as new
FIGURES 64–69: Cyclotella pseudokansasica. SEM. Figures 64, 65. External valve views. Prominent spines or spine bases are located about the periphery of the valves. Multiseriate fascicles alternate with thick costae. Openings of the marginal fultoportulae are located near the base of the mantle. Scale bars = 1 µm. Figures 66–69. Internal valve views. The valves have a few to several scattered central areolae, and marginal fultoportulae positioned on every second or third costa. Scale bars = 1 µm (in figs 64–66, 68, 69). Scale bar = 2µm (in fig. 67).
FIGURES 56–63 in Morphology of some fossil lacustrine centric species from the western United States assigned to the genus Cyclotella (Bacillariophyta), including four described as new
FIGURES 56–63: Cyclotella pseudokansasica. LM. Valve views showing size diminution series. Fig. 61. Holotype. Scale bar = 5 µm.
FIGURES 50–55 in Morphology of some fossil lacustrine centric species from the western United States assigned to the genus Cyclotella (Bacillariophyta), including four described as new
FIGURES 50–55: Cyclotella stoermeri. SEM. Figures 50–52. External valve views. Fascicles are comprised of 1–3 rows of small areolae. The ribs are thickened and elevated, becoming thinner on the valve mantle. The valve center has enlarged areolae. Scale bars = 10 and 3 µm, respectively. Figures 53–55, internal valve views. Complex and simple alveolae are positioned around the perimeter of the valves. Thick and thin costae are evident, and marginal fultoportulae are evident on the recessed costae. Rimportulae are positioned also on the recessed costae. Areolae with domed cribra are evident in the center of the valves. Scale bars = 3, 2 and 1 µm, respectively.
FIGURES 32–37 in Morphology of some fossil lacustrine centric species from the western United States assigned to the genus Cyclotella (Bacillariophyta), including four described as new
FIGURES 32–37: Cyclotella discostelliformica. SEM. Figures 32, 33. External views showing valves with sunken and elevated central areas, respectively. Fascicles are composed of 2–5 rows of areolae. Openings of the marginal fultoportulae are located at or near the thickened ribs. They lack tubes or thickenings. The central portion of the valves have isolated areolae, that are larger than those of the fascicles. Scale bars = 1 µm. Figures 34–37. Internal valve views showing a single central fultoportula with 3 satellite pores, and marginal fultoportulae at every costa or every second costa. The rimoportula is located on or near a costa (arrows). Scale bars = 1 µm.
FIGURES 19–24 in Morphology of some fossil lacustrine centric species from the western United States assigned to the genus Cyclotella (Bacillariophyta), including four described as new
FIGURES 19–24: Cyclotella kansasica, SEM. Figures 19–21, external views. Flat valve face has striae with 3–4 rows of areolae towards the margin, and scattered areolae in the center, usually with one enlarged depression. Openings of the marginal fultoportulae occur on every rib. Thick spines or bases are visible on the margin of the valve. Scale bars = 1 µm. Figures 22–24, internal views. Marginal fultoportulae occur on every costa. A ring of simple alveolae is present on the mantle. Central fultoportulae are wanting. Central areolae do not reflect an enlarged opening seen externally. Scale bars = 1 µm.
FIGURES 6–9 in Morphology of some fossil lacustrine centric species from the western United States assigned to the genus Cyclotella (Bacillariophyta), including four described as new
FIGURES 6–9: Cyclotella idahica. SEM. Figures 6, 7, 9. external views. Valve views showing transversely undulate central area with irregularly arranged areolae and covered by bumps. Present are external openings of areolae and short tubes of marginal fultoportulae. Spines and/or spines bases are found on the valve face/mantle junction. Scale bars = 1 µm. Figure 8, internal view. Valve view showing location of one fultoportula on the valve face. Arrow indicates position of the rimportula. Scale bar = 1 µm.
FIGURES 1–5 in Morphology of some fossil lacustrine centric species from the western United States assigned to the genus Cyclotella (Bacillariophyta), including four described as new
FIGURES 1–5: Cyclotella idahica. LM. Valve views showing highly undulate valve face. Fig. 2. Holotype. Scale bar = 10 µm.
FIGURES 40–49 in Morphology of some fossil lacustrine centric species from the western United States assigned to the genus Cyclotella (Bacillariophyta), including four described as new
FIGURES 40–49: Cyclotella stoermeri. LM. Valve views showing size diminution series. Note dissimilar lengths of striae. Fig. 40. Holotype. Scale bar = 10 µm.
FIGURES 25–31 in Morphology of some fossil lacustrine centric species from the western United States assigned to the genus Cyclotella (Bacillariophyta), including four described as new
FIGURES 25–31: Cyclotella discostelliformica. LM. Valve views showing highly undulate valve face. Fig. 31. Holotype. Scale bar = 5 µm.
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