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13 results for “Lindavia”
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).
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
FIGURE 2 in Lindavia biswashanti, a new diatom species (Bacillariophyta) from Gokyo Cho, Himalayan Range, Nepal
FIGURE 2: Size diminution series of Lindavia biswashanti. Light microscope images captured under a Leica DM2500. The holotype specimen is image C. Scale bars are all 10 μm. The central fultoportula is readily visible in larger specimens (A–F) and slightly offset from the center of the valve. Rimoportulae are indistinct in light microscope. The distinguishing features are the three triangular-shaped raised areas juxtaposed with three lowered areas to make six sectors in a superficial likeness of the nuclear fallout-shelter symbol.
FIGURE 3 in Lindavia biswashanti, a new diatom species (Bacillariophyta) from Gokyo Cho, Himalayan Range, Nepal
FIGURE 3: Scanning electron micrographs of Lindavia biswashanti. Image A exhibits the external view with central fultoportula (cfp), rimoportula (rp), and marginal fultoportulae of which one is arrowed (mfp). Image B is a small specimen that exhibits granules around the margin. Interior expressions of the central fultoportula, rimoportula, and marginal fultoportula are shown in images D & E. Image F is a close up of the rimoportula and marginal fultoportula shown in image D.
FIGURE 1 in Lindavia biswashanti, a new diatom species (Bacillariophyta) from Gokyo Cho, Himalayan Range, Nepal
FIGURE 1: Map of the Sagarmatha National Park region, Province No. 1, Solukhumbu District, Nepal. The region is dominated by some of the tallest peaks in the world. Mount Everest (8,848 m) and Cho Oyu (8,188 m) are shown. The lakes from which samples were collected comprise some of the highest elevation lakes in the world. Gokyo Cho is the locality from which the holotype material is collected. Location of the region in the Himalayas (inset).
FIGURE 1 in Three novel species of Bacillariophyta (Diatoms) belonging to Aulacoseira and Lindavia from the Pliocene Hadar Formation, Afar Depression of Ethiopia
FIGURE 1. Location of the NAO and NAW drill core sites in the Afar Depression of Ethiopia.
FIGURE 7 in Three novel species of Bacillariophyta (Diatoms) belonging to Aulacoseira and Lindavia from the Pliocene Hadar Formation, Afar Depression of Ethiopia
FIGURE 7. Diminution size series of L. cohenii (A–I). The Holotype at differing focal planes (J–L).
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