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227 results for “lake morphology”
FIGURES 142–147 in Morphological and molecular characterization of twenty-five new Diploneis species (Bacillariophyta) from Lake Tanganyika and its surrounding areas
FIGURES 142–147. Diploneis tessellata sp. nov., SEM external valve views, Lake Tanganyika. 142, 144, 145. Specimen from Kiganza Bay. 143, 146, 147. Specimens from Isanga Bay. 142, 143. View of a whole valve; white arrowed uniseriate striae pattern. 144. Distal raphe ends with deflected terminal fissures. 145. Detail semi-circular shaped interalveolar fin ornamentations on the canal. 146. Central area with bent teardrop depression with proximal raphe ends. 147. Half-valve showing the raphe branch. Scale bars = 10 μm (Fig. 143), 5 μm (Figs 142, 147), 2 μm (Figs 144–146).
FIGURES 148–151 in Morphological and molecular characterization of twenty-five new Diploneis species (Bacillariophyta) from Lake Tanganyika and its surrounding areas
FIGURES 148–151. Diploneis tessellata sp. nov., SEM internal valve views, Lake Tanganyika. 148. Specimen from Mutondwe Island. 149. Specimen from Kalambo Falls Lodge. 150. Specimen from Isanga Bay. 151. Specimen from Rukoma area. 148–151. View of a whole valve, showing simple and slightly elevated raphe, alveoli covered by a thin silica layer, and closed longitudinal canal. Scale bar = 10 μm.
FIGURES 97–101 in Morphological and molecular characterization of twenty-five new Diploneis species (Bacillariophyta) from Lake Tanganyika and its surrounding areas
FIGURES 97–101. Diploneis latiuscula sp. nov., SEM external valve views, Lake Tanganyika, Jakobsen Beach. 97. Whole valve. 98. Distal raphe ends with deflected terminal fissures. 99. White arrowed uniseriate becoming biseriate striae pattern. 100. Detail areolae structure and inter-areolar thickenings with serrated fin-like silica ridges. 101. Central area with recessed proximal raphe ends. Scale bars = 10 μm (Fig. 97), 2 μm (Figs 98, 100, 101), 1 μm (Fig. 99).
FIGURES 126–131 in Morphological and molecular characterization of twenty-five new Diploneis species (Bacillariophyta) from Lake Tanganyika and its surrounding areas
FIGURES 126–131. Diploneis tumida sp. nov., SEM external (Figs 126–128) and internal (Figs 129–131) valve views, Lake Tanganyika. 126. Specimen from Mutondwe Island. 127, 128. Specimen from Kiganza Bay. 129–131. Specimen from Isanga Bay. 126. Whole valve. 127. Distal raphe ends with deflected terminal fissures and areolae opened in deep pits; note the inter-areolar fin-like silica ornamentations (white arrow). 128. Central area with extended teardrop shaped depression with proximal raphe ends. 129. Central area with slightly elevated proximal raphe ends and alveolate openings occluded by a thin silica layer. 130. View of a whole valve. 131. Distal raphe ends slightly elevated and distant from the valve apices. Scale bars = 10 μm (Fig. 130), 5 μm (Figs 126, 129, 131), 1 μm (Figs 127, 128).
FIGURES 57–60 in Morphological and molecular characterization of twenty-five new Diploneis species (Bacillariophyta) from Lake Tanganyika and its surrounding areas
FIGURES 57–60. Diploneis cristata sp. nov., SEM internal valve views, Lake Tanganyika, Isanga Bay. 57. Whole valve. 58. Central area with simple and slightly elevated proximal raphe ends. 59. Mid-valve, showing proximal raphe ends and alveolate openings covered by a thin silica layer. 60. Close view of alveoli and valvocopula with serrated advalvar edges. Scale bars = 10 μm (Fig. 57), 5 μm (Figs 58–60).
FIGURES 67–72 in Morphological and molecular characterization of twenty-five new Diploneis species (Bacillariophyta) from Lake Tanganyika and its surrounding areas
FIGURES 67–72. Diploneis major sp. nov., SEM external (Figs 67, 68) and internal (Figs 69–72) valve views, Lake Tanganyika. 67–69, 71, 72. Specimens from Isanga Bay. 70. Specimen from Kiganza Bay. 67. View of a whole valve, showing canal structure, striae structure, and inter-areolar fin-like shaped silica ornamentations. 68. Detail mid-valve, showing shallow depression with proximal raphe ends and undistinguishable hyaline area separating the alveoli from the canal; white arrowed cribra structure. 69. Distal raphe ends with deflected terminal fissures. 70. Valve view. 71. Distal raphe endings slightly elevated and distant from the valve apices. 72. Central area with simple and slightly elevated proximal raphe ends; white arrowed thin perforated silica layer covering the alveoli. Scale bars = 10 μm (Figs 67, 70), 5 μm (Figs 68, 69, 71, 72).
FIGURES 36–40 in Morphological and molecular characterization of twenty-five new Diploneis species (Bacillariophyta) from Lake Tanganyika and its surrounding areas
FIGURES 36–40. Diploneis tanganyikae sp. nov., SEM external valve views, Lake Tanganyika. 36, 38–40. Specimen from Kiganza Bay. 37. Specimen from Mutondwe Island. 36, 37. View of a whole valve. 38. Central area with extended teardrop shaped depression with proximal raphe ends. 39. Detail valve apices, showing distal raphe ends with deflected terminal fissures and inter-areolar thickenings bearing fin-like silica ridge ornamentations; note white arrowed areolae divided by thick thickenings also bearing silica ornamentations. 40. White arrowed large round to rectangular areolae covered by cribra. Scale bars = 10 μm (Figs 36, 37), 2 μm (Figs 38–40).
FIGURES 79–84 in Morphological and molecular characterization of twenty-five new Diploneis species (Bacillariophyta) from Lake Tanganyika and its surrounding areas
FIGURES 79–84. Diploneis gigantea sp. nov., SEM external (Figs 79–81) and internal (Figs 82–84) valve views, Lake Tanganyika. 79–81. Specimen from Isanga Bay. 82–84. Specimen from Mutondwe Island. 79. Whole valve. 80. Central area with teardrop shaped depression with proximal raphe ends. 81. Distal raphe ends with deflected terminal fissures; white arrowed areola divided by thickened bars. 82. Half-valve view, showing the curved raphe placed in a depression formed by the canal. 83. Whole valve view. 84. Central area with simple slightly elevated proximal raphe ends. Scale bars = 20 μm (Fig. 79), 10 μm (Figs 82, 83), 5 μm (Figs 80, 81, 84).
FIGURES 47–52 in Morphological and molecular characterization of twenty-five new Diploneis species (Bacillariophyta) from Lake Tanganyika and its surrounding areas
FIGURES 47–52. Diploneis cristata sp. nov., LM valve views, Lake Tanganyika. 47, 49–52. Specimens from Kalambo Falls Lodge. 48. Specimen from Chituta Bay. Fig. 48. Holotype specimen. Scale bar = 10 μm.
FIGURES 2–11 in Morphological and molecular characterization of twenty-five new Diploneis species (Bacillariophyta) from Lake Tanganyika and its surrounding areas
FIGURES 2–11. Diploneis salzburgeri sp. nov., LM valve views, Lake Tanganyika. 2, 3, 5, 6, 9. Specimens from southern parts of Lake Tanganyika, Kalambo Falls Lodge. 4. Specimen from Kalya Bay. 7. Specimen from Ndole Bay. 8. Specimen from Jakobsen Beach, near Kigoma. 10, 11. Specimens from Buhingu Island. Fig. 7. Holotype specimen. Scale bar = 10 μm.
FIGURES 53–56 in Morphological and molecular characterization of twenty-five new Diploneis species (Bacillariophyta) from Lake Tanganyika and its surrounding areas
FIGURES 53–56. Diploneis cristata sp. nov., SEM external valve views, Lake Tanganyika. 53, 55. Specimen from Isanga Bay. 54, 56. Specimen from Ndole Bay. 53. Whole valve. 54. Close view of striae structure; arrowed areola divided by thick thickenings bearing fin-like silica ridges. 55. Central area with extended teardrop shaped depressions with proximal raphe ends. 56. Distal raphe ends with deflected terminal fissures. Scale bars = 10 μm (Fig. 53), 5 μm (Figs 55, 56), 2 μm (Fig. 54).
FIGURES 108–125 in Morphological and molecular characterization of twenty-five new Diploneis species (Bacillariophyta) from Lake Tanganyika and its surrounding areas
FIGURES 108–125. Diploneis tumida sp. nov., LM valve views, Lake Tanganyika. 108, 116–125. Specimens from Ndole Bay. 109, 112–115. Specimens from Mahale National Park. 110. Specimen from Kalambo Falls Lodge. 111. Specimen from Mutondwe Island. Fig. 109. Holotype specimen. Scale bar = 10 μm.
FIGURES 24–35 in Morphological and molecular characterization of twenty-five new Diploneis species (Bacillariophyta) from Lake Tanganyika and its surrounding areas
FIGURES 24–35. Diploneis tanganyikae sp. nov., LM valve views, Lake Tanganyika. 24–26, 28, 30, 32, 33, 35. Specimens from Kiganza Bay. 27, 29, 31. Specimens from Jakobsen Beach, near Kigoma. 34. Specimen from Ndole Bay. Fig. 34. Holotype specimen. Scale bar = 10 μm.
FIGURES 61–66 in Morphological and molecular characterization of twenty-five new Diploneis species (Bacillariophyta) from Lake Tanganyika and its surrounding areas
FIGURES 61–66. Diploneis major sp. nov., LM valve views, Lake Tanganyika. All specimens are from the type material, Isanga Bay. Fig. 65. Holotype specimen. Scale bar = 10 μm.
FIGURES 102–107 in Morphological and molecular characterization of twenty-five new Diploneis species (Bacillariophyta) from Lake Tanganyika and its surrounding areas
FIGURES 102–107. Diploneis latiuscula sp. nov., SEM internal valve views, Lake Tanganyika, Jakobsen Beach. 102, 105, 106. View of a whole valve, showing raphe structure and alveoli structure. 103. Detail of mid-valve, showing simple and slightly elevated proximal raphe ends. 104. Distal raphe ends simple and slightly elevated. 107. Close view of the alveoli opening covered by a thin silica layer. Scale bars = 10 μm (Fig. 105), 5 μm (Figs 102, 106), 2 μm (Figs 103, 104, 107).
FIGURES 41–46 in Morphological and molecular characterization of twenty-five new Diploneis species (Bacillariophyta) from Lake Tanganyika and its surrounding areas
FIGURES 41–46. Diploneis tanganyikae sp. nov., SEM internal valve views, Lake Tanganyika. 41, 44. Specimen from Kiganza Bay. 42, 43, 45, 46. Specimen from Mutondwe Island. 41, 42. View of a whole valve. 44. Detail alveolate openings covered by thin silica layers. 45. Central area with simple and slightly elevated proximal raphe ends. Fig. 43. Distal raphe ends slightly elevated and distant from the valve apices. 46. Broken valve, showing the alveoli structure and chambered wall externally occluded by cribra. Scale bars = 20 μm (Fig. 42), 10 μm (Fig. 41), 5 μm (Figs 43, 45), 2 μm (Figs 44, 46).
FIGURE 1 in Morphological and molecular characterization of twenty-five new Diploneis species (Bacillariophyta) from Lake Tanganyika and its surrounding areas
FIGURE 1. Maps of Africa with major drainage systems. a) Map of Africa indicating the general location of the East African Rift (framed in bold grey lines). b) Map of East African Rift with sample (purple circles) and type (green circles) localities for all twenty-five new Diploneis species. c) Bathymetric map of the three sub-basins of Lake Tanganyika with close-up of sampling sites in the lake. d) Key sampling sites in the northern Kigoma sub-basin of Lake Tanganyika. e) Key sampling sites in the central Kundwe sub-basin of Lake Tanganyika. f) Key sampling sites in the southern Kipili sub-basin of Lake Tanganyika. Location details for each species are given in the descriptions.
FIGURES 18–23 in Morphological and molecular characterization of twenty-five new Diploneis species (Bacillariophyta) from Lake Tanganyika and its surrounding areas
FIGURES 18–23. Diploneis salzburgeri sp. nov., SEM internal valve views, Lake Tanganyika, Kiganza Bay near Gombe National Park. 18, 21. View of a whole valve. 19, 23. Distal raphe endings slightly elevated and distant from the valve apices. 20. Central area with simple and slightly elevated proximal raphe ends. 22. Close view of alveolate openings covered by thin silica layer. Scale bars = 10 μm (Figs 18, 21), 5 μm (Figs 19, 20, 22, 23).
FIGURES 12–17 in Morphological and molecular characterization of twenty-five new Diploneis species (Bacillariophyta) from Lake Tanganyika and its surrounding areas
FIGURES 12–17. Diploneis salzburgeri sp. nov., SEM external valve views, Lake Tanganyika, Mutondwe Island. 12, 13. Valve view, showing axial area patterened with irregularly rounded ornamentations. 14. Detail of mid-valve, showing extended teardrop shaped depression with proximal raphe ends and recessed cribrate areolae; white arrowed inter-areolar thickenings bearing fin-like silica ridge ornamentations serrated into 7–4 notched edges. 15. Close view of uniseriate striae; white arrowed inter-areolar transapically oriented fin-like silica ridges. 16. Detail valve apices, showing distal raphe ends with deflected terminal fissures, fin-like silica ridges, and complex areolae; white arrowed robust thickenings dividing the areolae, black arrowed thin flaps of silica covering the areolae. 17. Central area with proximal raphe ends positioned within a small depression; white arrowed irregularly rounded ghost-like areolae. Scale bars = 20 μm (Figs 12, 13), 10 μm (Fig. 15), 5 μm (Figs 14, 16), 2 μm (Fig. 17).
FIGURES 85–96 in Morphological and molecular characterization of twenty-five new Diploneis species (Bacillariophyta) from Lake Tanganyika and its surrounding areas
FIGURES 85–96. Diploneis latiuscula sp. nov., LM valve views, Lake Tanganyika. All specimens displayed are from the type material, Jakobsen Beach. Fig. 91. Holotype specimen. Scale bar = 10 μm.
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