Find research datasets worth reusing

opencc-by-4.0Dec 2016View details →

Fig. 8 in Papposphaera heldalii sp. nov. (Haptophyta, Papposphaeraceae) from Svalbard

Fig. 8. Schematic drawings of coccolith structures in species of Papposphaera (not drawn to scale). a – body coccoliths; b – calyx design; c – coccoliths with central processes; A – P. sagittifera; B – P. sarion; C – P. arctica; D – P. iugifera; E – P. heldalii. Notice that alternative shapes are included for some species (A/a, B/a, D/a) and that the P. sarion design for a coccolith with a central process (B/c) is potentially as variable as B/a.

opencc-by-4.0Dec 2016View details →

Figs 2–7 in Papposphaera heldalii sp. nov. (Haptophyta, Papposphaeraceae) from Svalbard

Figs 2–7. Papposphaera heldalii SEM images of cells from the Svalbard region collected during Jan. 2014 (Figs 4–5) and March 2014 (Figs 2–3, 6–7). 2 – cluster of coccoliths shown at high magnification. Notice in particular details of the calyx and coccolith rim calcification. The arrows point to extensions from the pentagonal elements separating the rod-like elements. See also ruptures in the organic base plates of body coccoliths; 3 – whole cell (type specimen) showing the general disposition of types of coccoliths within the coccosphere. A single coccolith (enlarged in Fig. 6) shows the central area calcification of a calicate coccolith; 4 – whole cell. Notice the difference in length of the central process among the two clusters of coccoliths carrying these. See also the conspicuous size differences between neighboring body coccoliths; 5 – body coccoliths showing large individual size differences; 6 – detail of central area calcification in a coccolith that carries a central process (broken away here); 7 – detail of coccolith rim from coccoliths that carry a central process. The arrows point to extensions from the pentagonal elements separating the rod-like elements.

opencc-by-4.0Dec 2016View details →

Fig. 1 in Papposphaera heldalii sp. nov. (Haptophyta, Papposphaeraceae) from Svalbard

Fig. 1. Svalbard sampling sites during MicroPolar cruises. The type locality of P. heldalii is marked by a square, and arrows point to additional sampling sites yielding P. heldalii material.

Fig. 11 in Ventimolina stellata gen. et sp. nov. (Haptophyta, Papposphaeraceae) from Warm Water Regions

Fig. 11. Schematic drawings of Ventimolina stellata BC and CFC drawn approximately to scale. A – side view of BC; B – top view of BC; C – top view of CFC; D – side view of CFC.

Figs 2–6 in Ventimolina stellata gen. et sp. nov. (Haptophyta, Papposphaeraceae) from Warm Water Regions

Figs 2–6. Ventimolina stellata TEM whole mounts of a single specimen from the Andaman Sea. 2 – whole cell (holotype) with details accounted for in Figs 3–6; 3 – details of circumflagellar coccoliths. The arrow points to a distally slightly convex BC in side view; 4 – detail of body coccolith in lateral view showing clearly the rim and central area calcification and the central superstructure which is slightly convex distally; 5 – body coccoliths showing the single layer rim calcification; 6 – details of the body coccolith calyx ('windmills').

Fig. 1. A in Ventimolina stellata gen. et sp. nov. (Haptophyta, Papposphaeraceae) from Warm Water Regions

Fig. 1. A – study region and the Andaman Sea; B – area of investigation in the western part of the Andaman Sea, off the coast of Thailand. Transect sampling is indicated by lines of stations, contour lines illustrate bathymetry by isolines of 5, 10, 20, 50, 100 and 200 m bottom depth. The type locality of V. stellata is encircled.

Figs 7–10 in Ventimolina stellata gen. et sp. nov. (Haptophyta, Papposphaeraceae) from Warm Water Regions

Figs 7–10. Ventimolina stellata SEM images of two cells from the NW Mediterranean. 7 – complete coccosphere; 8 – detail of BC from the cell shown in Fig. 7. The arrow points to a coccolith calyx that is clearly convex; 9 – complete coccosphere. The arrow points to a CFC that clearly shows the central are calcification and further lends support to the interpretation of the calyx being perpendicular to the longest axis of the CFC; 10 – detail of BC from the cell shown in Fig. 9. A distinctly convex coccolith calyx is pointed out by arrow.

Fig. 9 in New species of Pavlovophyceae (Haptophyta) and revision of the genera Exanthemachrysis, Rebecca and Pavlova

Fig. 9. Rebecca billardiae Véron sp. nov. (AC537), flagellar apparatus details of motile cells. A–E. SEM images. A. Ventral view of a cuboid cell with the S-shaped distally tapered AF and curved H. B-C. Ventral views of angular cells with the S-shaped AF covered with KS, the vestigial PF and the curved bipartite H between both F. D-E. Details of the insertion the 3 appendages. D. Vestigial PF. E. Bipartite H with the proximal hook-shaped half and the distal half forming a pearl string structure. Note distally tapered AF. F–G. Negative staining images. F. Proximal part of the tomentose AF with multilayered KS (white arrow), extending after a bare proximal zone (black arrow) in the immediate vicinity of the cell. G. Details of mono-constricted (white arrows) KS covering the distally attenuated AF. Scale bars: A, C, E–F = 1 µm; B = 2 µm; D = 100 nm; G = 200 nm.

Fig. 8 in New species of Pavlovophyceae (Haptophyta) and revision of the genera Exanthemachrysis, Rebecca and Pavlova

Fig. 8. Rebecca billardiae Véron sp. nov. (AC537), flagella, plasma membrane and knob-scales, TEM images (A–D, G–H = Fix 1; E–F = Fix 2). A. Angular cell with bilobed C and TH lamellae grouped by 3 sometimes twisted. B. Longitudinal section of a motile cell displaying the AF bearing few KS (white arrows) and the adjacent H. C. Cross-section of the sub-apical pit of a non-swimming cell containing the bases of H and F (transverse section – right, oblique section – left) sheathed by cytoplasm and surrounded by the plasma membrane (black arrow). D. Inflated G secretory vesicles unloading their materials including KS near the flagellar insertion zone. E. Periphery of a cell showing continuity of the plasma membrane along the curved AF, both covered with pedunculate KS (white arrows). F. Isolated plasma membrane retaining pedunculate mono-constricted club-shaped KS sporadically dispersed on its surface. G. Longitudinal section of a motile cell displaying the AF and PF both bearing few KS (white arrows) and the naked H. Note discharge of KS by G cisternae. H. Reduced PF cut in median longitudinal section showing microtubules and bearing a dense pedunculate club-shaped KS (white arrow). Central pair of microtubules is absent. Scale bars: A = 2 µm; B–D, H = 0.5 µm; E–F = 50 nm; G = 1 µm.

Fig. 5 in New species of Pavlovophyceae (Haptophyta) and revision of the genera Exanthemachrysis, Rebecca and Pavlova

Fig. 5. Exanthemachrysis fresneliae Véron sp. nov. (AC35), flagella, plasma membrane and knob-scales, TEM images (Fix 1). A. Longitudinal section of the pit area with 2 emerging F (white arrows = central microtubules) surrounded by a sheath of reticulum enclosing their bases. Plasma membrane (black arrow), underlined with endoplasmic reticulum (white stars), covered with KS. B. Details of the cell surface in the region of F emergence. Oblique sections of F bases with central microtubules (white arrow). Stalked ovoid KS partially covering the F bases and the plasma membrane. C. G with cisternae and secretory vesicles containing KS (white arrows). Scale bars: A–B = 50 nm; C = 0.5 µm.

Fig. 2 in New species of Pavlovophyceae (Haptophyta) and revision of the genera Exanthemachrysis, Rebecca and Pavlova

Fig. 2. Exanthemachrysis fresneliae Véron sp. nov. (AC35), palmelloid sister cells, TEM image (Fix 1). Benthic colony of non-motile sister cells embedded in a common non-stratified M envelope (white stars); parietal C with helicoidal arrangement of the TH lamellae and a bulging PY near the F bases perpendicular to each other (white arrows), with the basal bodies connecting to the microtubular root (black arrows) running to the central area of the cell. Secretory vesicles from G (black star) ready to discharge content near the pit where the F emerge. Scale bar: 0.5 µm.

Fig. 12 in New species of Pavlovophyceae (Haptophyta) and revision of the genera Exanthemachrysis, Rebecca and Pavlova

Fig. 12. Pavlova sp. AC248, flagellar apparatus details of motile cells. A. SEM image of apical view of a swimming cell with a complete F apparatus emerging almost in the centre of a narrow, shallow pit: tomentose S-shaped AF, end-tapered PF and bipartite H inserted between both. Bulging PY on the opposite side. B–E. Negative staining images. B. Details of the base of the F apparatus showing the AF, PF with a tapered end, and H consisting of a proximal part of constant diameter and a distal part of subequal length and smaller diameter. C. Distal rounded part of the AF (with a blistering of the membrane) showing covering of long non-tubular hairs and regular arrangement of KS. D. Central part of the AF showing flat KS with a slight median constriction (black arrows) arranged in several more or less regular layers. E. Proximal part of the AF with multilayered KS, extending after a bare area in the immediate vicinity of the cell. Scale bars: A–B = 1 µm; C = 0.5 µm; D = 50 nm; E = 200 nm.

Fig. 4 in New species of Pavlovophyceae (Haptophyta) and revision of the genera Exanthemachrysis, Rebecca and Pavlova

Fig. 4. Exanthemachrysis fresneliae Véron sp. nov. (AC35), flagellar apparatus of motile cells. A. SEM image of side view of swimming cell with a 3–4 µm long conspicuous sinusoidal S-shaped and slightly tapering AF emerging almost mid-ventrally and thickly covered by KS (white arrows). B–C. Negative staining image. B. Detail of the 3 appendices, the AF, the H and the PF composed of 2 parts of sub-equal lengths with a distal attenuation. C. Detail of the AF of a cell bearing ovoid KS (black arrows) down to the base, in regular helicoidal rows. Scale bars: A–B = 1 µm; C = 0.1 µm.

Fig. 1 in New species of Pavlovophyceae (Haptophyta) and revision of the genera Exanthemachrysis, Rebecca and Pavlova

Fig. 1. Exanthemachrysis fresneliae Véron sp. nov. (AC35), palmelloid and swimming cells, LM images. A. Benthic colonies of non-motile sister cells embedded in non-stratified M (black arrows) with storage granules of P (white arrows). B. Benthic non-motile cell embedded in non-stratified M (black arrow) with storage granule of P (white arrow), bilobed C and anterior bulging PY. C. Apical view (bottom right) and side view (up left) of 2 swimming cells with conspicuous S-shaped AF (black arrows) emerging almost mid-ventrally from a pit (white arrows). D. Side view of motile cells with bulging PY (black arrows). Scale bars: A = 5 µm; B = 1 µm; C–D = 2 µm.

Fig. 7 in New species of Pavlovophyceae (Haptophyta) and revision of the genera Exanthemachrysis, Rebecca and Pavlova

Fig. 7. Rebecca billardiae Véron sp. nov. (AC537), flagellate motile and non-motile cells, LM images. A. Gathering angular non-swimming flagellate cells with an S-shaped AF (white arrows). B. Polyhedral free-swimming cell with bilobed lateral golden-brown C, S-shaped AF (white arrow) and posterior beaded filipodium (black arrows). C–D. Cells of various shapes showing sub-apical insertion into a pit (white arrows) of the S-shaped AF. Posterior branched beaded filipodia present at the terminal part of the cell (black arrows). E. Ventral view of an angular free-swimming cell with sub-apical insertion of S-shaped AF into a pit (white arrow). F. Rounded cells with S-shaped sub-apically inserted AF (white arrow), posterior filipodium (black arrow) and bilobed golden-brown C. Scale bars: Scale bars: A = 4 μm; B–D, F = 5 μm; E = 1 μm.

Fig. 3 in New species of Pavlovophyceae (Haptophyta) and revision of the genera Exanthemachrysis, Rebecca and Pavlova

Fig. 3. Exanthemachrysis fresneliae Véron sp. nov. (AC35), palmelloid cell, TEM image (Fix 1). Nonmotile benthic cell embedded in non-stratified M showing single parietal C with a bulging PY at its end. Row of few osmiophilic vesicles forming an E in C stroma located at the junction of TH and PY. Both F bases (white arrows) positioned in continuity with a notch in the nucleus facing the sub-ventral pit (black arrow). Scale bar:1 µm.

Fig. 6 in New species of Pavlovophyceae (Haptophyta) and revision of the genera Exanthemachrysis, Rebecca and Pavlova

Fig. 6. Exanthemachrysis fresneliae Véron sp. nov. (AC35), viroplasm, TEM images (Fix 1). A. Benthic non-motile cell embedded in M; parietal C lobes with helicoidal arrangement of the TH lamellae. Cytoplasmic assembly of pentahedral virus (V). B. Viral particles scattered in the cytoplasm. Scale bars: A = 0.2 µm; B = 50 nm.

Fig. 11 in New species of Pavlovophyceae (Haptophyta) and revision of the genera Exanthemachrysis, Rebecca and Pavlova

Fig. 11. Pavlova sp. AC248, chloroplast details, TEM images (Fix 1). A. Benthic colony of non-motile cells surrounded by a single, loose, non-layered M (white stars); single cup-shaped parietal C. B. Longitudinal section of a flagellate cell with parallel arrangement of TH in the C. Posterior PY protruding from the centre of the C, opposite a F, with an E at the tip of the C on its inner face. C. Detail of parallel TH lamellae forming stacks of 4 or 5 ending at the beginning of the PY.D. Detail of F insertion area showing proximity of the intrachloroplastic E to the long flagellar root (white arrows). Scale bars: A–B = 2 µm; C–D = 200 nm.

Fig. 10 in New species of Pavlovophyceae (Haptophyta) and revision of the genera Exanthemachrysis, Rebecca and Pavlova

Fig. 10. Pavlova sp. AC248, motile cells, LM images. Side views of curved oblong (A), ovoid (B) and spherical (C) free-swimming cells with conspicuous S-shaped AF emerging apically. Greenish brown parietal C (black arrows) with an E and a posterior bulging PY. Vacuolar crystals of barium sulphate (white arrows). Scale bars = 10 µm.