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485 results for “new diatom species”
FIGURES 16–23 in Eunotia pottieziana, a new diatom (Eunotiaceae, Bacillariophyta) species found in a tropical aquarium
FIGURES 16–23. Eunotia pottieziana Van de Vijver sp. nov. SEM images taken from the holotype sample (BR-4816, tropical freshwater aquarium, Belgium). 16. SEM view of a short chain showing 3 connected frustules. 17. SEM external detail of the apices of a frustule, showing the shape of the raphe branches and the girdle bands. 18. SEM external view of the ventral side of an entire frustule. 19. SEM externa detail of the dorsal valve face/mantle junction showing the presence of short, low ridges. 20. SEM external view of two valves. 21. SEM external detail of a valve apex showing the terminal raphe fissures and the external rimoportula opening (arrow). 22. SEM internal view of an entire valve. The arrow shows the position of the internal rimoportula structure. 23. SEM internal detail of a valve apex with the rimoportula (apex) and the pseudoseptum. Scale bars represent 10 µm, except for Figs 19, 21 & 23 where scale bar = 1 µm.
FIGURES 1–15 in Eunotia pottieziana, a new diatom (Eunotiaceae, Bacillariophyta) species found in a tropical aquarium
FIGURES 1–15. Eunotia pottieziana Van de Vijver sp. nov. LM images of specimens taken from the holotype sample (BR-4816, tropical freshwater aquarium, Belgium). 1–2. LM views of two short chains in girdle view observed in untreated material. 3. LM view of the ventral side of a frustule showing the raphe branches. 4–15. LM valve views of specimens of the type population arranged in decreasing length. Scale bar = 10 µm.
FIGURES 49–59 SEM, internal valve views. Figs 49, 50, 55, 56 in Sichuaniella deqinensis sp. nov., a new diatom species (Bacillariophyceae) from a high altitude lake in the Hengduan Mountains, SW China
FIGURES 49–59 SEM, internal valve views. Figs 49, 50, 55, 56. Internal view of entire valve. Areolae are probably occluded by hymenes internally when uncorroded. White arrows point where can be seen two elliptic cavities. Figs 51, 57, 58. Internal view of raphe with small helictoglossa. Figs 52–54, 57, 59. The central raphe ends are masked by a silica flap. Two elliptic cavities below the flaps are connected with narrow canals in the two peculiar appendices which protrude "pervalvar" into the valve interior. Scale bars = 200 nm (Figs 52, 53), 1 μm (Fig. 49–51, 54–59).
FIGURES 39–48 SEM, external views. Figs. 39, 41, 43, 44 in Sichuaniella deqinensis sp. nov., a new diatom species (Bacillariophyceae) from a high altitude lake in the Hengduan Mountains, SW China
FIGURES 39–48 SEM, external views. Figs. 39, 41, 43, 44. An entire valve with multiseriate area foramina. Fig. 40 Girdle views. Figs 45–48. Valve apices, raphe with short terminal fissures deflected. Fig.42. Valve center, the raphe curve to the primary side into very large, crater-like grooves. Scale bars = 2 μm (Figs. 40, 41), 1 μm (Figs 39, 42–48).
FIGURES 1–38 in Sichuaniella deqinensis sp. nov., a new diatom species (Bacillariophyceae) from a high altitude lake in the Hengduan Mountains, SW China
FIGURES 1–38 LM micrographs of the type population of Sichuaniella deqinensis in Lake Deqin5. Valve views, showing the valve variability of the holotype population. Figs 24/25; and 26/27 the pillar-like pairs of internal structures may provide a better stability of the frustules. This however only if it could be proved that they connect epi- and hypovalve. Scale bar = 2 μm.
TABLE 1 in Gomphonema rajaguruii sp. nov., a new diatom (Bacillariophyceae) species from the Western Ghats, India
<p><b>TABLE 1.</b> Comparison between the morphologically similar species and <i>Gomphonema rajaguruii sp. nov.</i> from the different sources. (<i>—</i> indicates unknown)</p><table><tbody><tr><th><b>Features / Species</b></th><th><i>Gomphonema rajaguruii sp. nov</i></th><th><b><i>Gomphonema kallarense</i> Pardhi <i>et al</i>. 2020</b></th><th><b><i>Gomphonema lujanense</i> E. Reichardt & Maidana 2008</b></th><th><b><i>Gomphonema pseudointermedium</i> E. Reichardt 2008</b></th><th><b><i>Gomphonema zellense</i> E. Reichardt 1999</b></th><th><b><i>Gomphonema supertergestinum</i> E. Reichardt 2009</b></th><th><b><i>Gomphonema irroratum</i> Hustedt 1945</b></th></tr></tbody><tbody><tr><th><b>Valve length (μm)</b></th><td>45.5–71.0</td><td>32.9–46.6</td><td>176.4–52.6</td><td>28.0–55.0</td><td>27.0–60.0</td><td>22.0–52.0</td><td>24.0–37.0</td></tr><tr><th><b>Valve width (μm)</b></th><td>8.8–12.8</td><td>6.8–9.1</td><td>5.6–9.0</td><td>6.6–7.7</td><td>9.2–11.0</td><td>7.0–9.0</td><td>5.5–7.5</td></tr><tr><th><b>Valve shape</b></th><td>Lanceolate - Rhombic</td><td>Lanceolate-clavate</td><td>Lanceolate-clavate</td><td>Clavate</td><td>Clavate</td><td>Lanceolate to elliptic</td><td>Clavate</td></tr><tr><th><b>Head pole</b></th><td>Slightly broadly rounded towards pole</td><td>Broadly rounded, almost flat, slight capitate</td><td>Bluntly rounded or truncate with small pore field</td><td>Obtusely rounded</td><td>Rounded</td><td>Broadly rounded</td><td>Broadly rounded</td></tr><tr><th><b>Foot pole</b></th><td>Narrowly rounded, elongated towards pole</td><td>Narrow rounded</td><td>Narrow rounded</td><td>Narrow rounded</td><td>Rounded</td><td>Narrowly rounded</td><td>Rounded</td></tr><tr><th><b>Striae (10 μm)</b></th><td>9–10 in central area 10–12 towards poles</td><td>9–13</td><td>7–12</td><td>10–11</td><td>8–10</td><td>9–12</td><td>14–16</td></tr><tr><th><b>Striae pattern (Head to Centre)</b></th><td>Slightly radiate from head pole to central valve</td><td>Slight radiate</td><td>Moderately radiate</td><td>Strongly radiate</td><td>Radiate</td><td>Radiate</td><td>Strongly Radiate</td></tr><tr><th><b>Striae pattern (Centre to Foot)</b></th><td>Strongly radiate towards the foot pole</td><td>Radiate</td><td>Radiate</td><td>Weakly radiate</td><td>Slightly radiate</td><td>Parallel</td><td>Radiate</td></tr><tr><th><b>Areolae (10 μm)</b></th><td>60–70</td><td>60–70</td><td><b>—</b></td><td><b>—</b></td><td>22–26</td><td><b>—</b></td><td>30–35</td></tr><tr><th><b>Areolae pattern</b></th><td>Biseriate, slit-shaped, aligned alternatively</td><td>Biseriate, slit-shaped, aligned alternatively</td><td>Biseriate, slit-shaped, aligned alternatively</td><td>Mostly biseriate, slit-shaped</td><td>Uniseriate and Partially biseriate</td><td>Biseriate, Round</td><td>Biseriate, round</td></tr><tr><th><b>Raphe</b></th><td>Weakly undulate</td><td>Lateral to undulate</td><td>Lateral</td><td>Lateral fissure somewhat undulate</td><td>Narrow, Lateral</td><td>Lateral or filiform</td><td>Lateral, undulated</td></tr><tr><th><b>Axial area (size)</b></th><td>Slightly broader, linear to lanceolate</td><td>Broad to narrow, lanceolate</td><td>Moderately narrow, linear to lanceolate</td><td>Narrow, linear</td><td>Narrow, linear</td><td>Narrow, linear</td><td>Narrow, linear to lanceolate</td></tr><tr><th><b>Central area</b></th><td>Distinct, small</td><td>Distinct, small</td><td>Unilaterally widened with one greatly shortened stria</td><td>Small</td><td>Large to nearly rectangular</td><td>Distinct, Extended to the edge, Very short striae</td><td>Small, irregular to elliptic</td></tr><tr><th><b>Pseudoseptum</b></th><td>Present</td><td>Present</td><td><b>—</b></td><td><b>—</b></td><td>Absent</td><td>Present</td><td><b>—</b></td></tr><tr><th><b>Stigma Externally</b></th><td><b>Oval</b></td><td>Round</td><td>Round</td><td>Round</td><td>Round</td><td>Round</td><td>1</td></tr><tr><th><b>Habitat</b></th><td>Wet wall</td><td>Stream</td><td>River</td><td>Lake</td><td>Lake</td><td>Lake</td><td>Lake</td></tr><tr><th><b>Type locality</b></th><td>Mahabaleshwar, Maharashtra, India</td><td>Kallar stream, Kerala, India</td><td>Lujan river, Argentina</td><td>Inley Lake, Burma</td><td>Zellsee Lake, Germany</td><td>Brandenburg, Germany</td><td>Balkan Highlands, Balkan Peninsula</td></tr><tr><th><b>Reference</b></th><td>Present study</td><td>Pardhi <i>et al</i>. (2020)</td><td>Reichardt (2008)</td><td>Reichardt (2008)</td><td>Reichardt (1999)</td><td>Reichardt (2009)</td><td>Hustedt (1945)</td></tr></tbody></table>
FIGURE 165 in Small diatoms (Bacillariophyta) in cultures from the Styx River, New Zealand, including descriptions of three new species
FIGURE 165. Bayesian phylogenies of Navicula, Sellaphora, and Eolimna strains from the Styx River, for 18S rDNA (left) and rbcL (right). Support numbers above branches are Bayesian posterior probabilities / Maximum Parsimony bootstrap values. Scale bar = 0.1 subsitutions/site. See text for substitution models and description of data sets.
FIGURE 164 in Small diatoms (Bacillariophyta) in cultures from the Styx River, New Zealand, including descriptions of three new species
FIGURE 164. Bayesian phylogenies of Craticula and Fistulifera strains from the Styx River, for 18S rDNA (left) and rbcL (right). Support numbers above branches are Bayesian posterior probabilities / Maximum Parsimony bootstrap values. Scale bar = 0.1 subsitutions/site. See text for substitution models and description of data sets.
FIGURE 163 in Small diatoms (Bacillariophyta) in cultures from the Styx River, New Zealand, including descriptions of three new species
FIGURE 163. Bayesian phylogenies of the Gomphonema strain from the Styx River, for 18S rDNA (left) and concatenated rbcL and 18S rDNA (right). Support numbers above branches are Bayesian posterior probabilities / Maximum Parsimony bootstrap values. Scale bar = 0.1 subsitutions/site. See text for substitution models and description of data sets.
FIGURE 162 in Small diatoms (Bacillariophyta) in cultures from the Styx River, New Zealand, including descriptions of three new species
FIGURE 162. Bayesian phylogenies of Nitzschia strains from the Styx River, for rbcL (left) and 18S rDNA (right). Support numbers above branches are Bayesian posterior probabilities / Maximum Parsimony bootstrap values. Scale bar = 0.1 subsitutions/site. See text for substitution models and description of data sets.
FIGURE 161 in Small diatoms (Bacillariophyta) in cultures from the Styx River, New Zealand, including descriptions of three new species
FIGURE 161. Bayesian phylogenies of Planothidium strains from the Styx River, for 18S rDNA (left) and rbcL (right). Support numbers above branches are Bayesian posterior probabilities / Maximum Parsimony bootstrap values. Scale bar = 0.1 subsitutions/ site. See text for substitution models and description of data sets.
FIGURE 160 in Small diatoms (Bacillariophyta) in cultures from the Styx River, New Zealand, including descriptions of three new species
FIGURE 160. Bayesian phylogenies of the Cyclotella strain from the Styx River, for rbcL. Support numbers above branches are Bayesian posterior probabilities / Maximum Parsimony bootstrap values. Scale bar = 0.1 subsitutions/site. See text for substitution models and description of data sets.
FIGURE 148–159 in Small diatoms (Bacillariophyta) in cultures from the Styx River, New Zealand, including descriptions of three new species
FIGURE 148–159. Craticula molestiformis, strain LCR-S:44:2, CHR618420. Scales: Fig. 148, 10 µm; Fig. 152, 5 µm (use in Figs 152–157); all others 1 µm. Figs 148–151. Live cells viewed by LM, showing lobed plastids (girdle view in Fig. 151). Figs 152–157. Cleaned frustules viewed by LM, showing thickened raphe/sternum and transverse striae. Figs 158, 159. Cleaned frustules viewed by SEM. Fig. 158, valve with intact margin, showing longitudinally aligned, slightly elongated areolae, narrow central area bordered by laterally elongated areolae, and narrow copulae; Fig. 159, valve with intact central raphe termini.
FIGURE 52–64 in Small diatoms (Bacillariophyta) in cultures from the Styx River, New Zealand, including descriptions of three new species
FIGURE 52–64. Nitzschia palea, strain LCR-S:6:4:1, CHR618410. Scales: Fig. 52, 10 µm; Fig. 61, 5 µm (use for Figs 53–62); Fig. 63, 0.5 µm; Fig. 64, 1 µm. Fig. 52. Live cells viewed by LM. Figs 53–62. Cleaned frustules viewed by LM, showing size variation and raphe canals on opposite margins (Figs 53, 54 are single valves; raphe is visible in Fig. 53). Fig. 63. TEM of cleaned frustule, centre of valve, showing continuous raphe with no central termini.
FIGURE 130–147 in Small diatoms (Bacillariophyta) in cultures from the Styx River, New Zealand, including descriptions of three new species
FIGURE 130–147. Sellaphora styxii, strain LCR-S:19:1:1, CHR618419. Scales: Fig. 130, 10 µm; Fig. 142, 5 µm (use for Figs 131–142); Fig. 144, 1 µm (use in Figs 143–146); Fig. 147, 1 µm. Fig. 130. Live cells viewed by LM, showing parietal plastids. Figs 131–142. Cleaned frustules viewed by LM, showing size variation (girdle view of frustules of different size in Fig. 142). Figs 143–147. SEM of cleaned frustules. Figs 143–146, valves of different size showing striae pattern: longer valves have more uniseriate striae; Fig. 147, epivalve and hypovalve showing opposing apical raphe termini.
FIGURE 87–96. Navicula cryptocephala strain LCR-S in Small diatoms (Bacillariophyta) in cultures from the Styx River, New Zealand, including descriptions of three new species
FIGURE 87–96. Navicula cryptocephala strain LCR-S:32:1, CHR618415. Scales: Fig. 87, 10 µm (use for Figs 87, 88); Fig. 89, 5 µm (use for Figs 89–93); all others 1 µm. Figs 87, 88. Live cells viewed by LM, showing paired parietal plastids close against valve margins. Figs 89–93. Cleaned frustules viewed by LM (girdle view in Fig. 93, showing curved valve faces). Figs 94–96. SEM of cleaned frustules. Fig. 94, whole frustule, showing elongated, longitudinally aligned areolae; Fig. 95, widened central area showing central raphe termini; Fig. 96, valve apex showing hooked raphe terminus and pattern of areolae.
FIGURE 76–86 in Small diatoms (Bacillariophyta) in cultures from the Styx River, New Zealand, including descriptions of three new species
FIGURE 76–86. Fistulifera saprophila, strain LCR-S:20:3, CHR618414. Scales: Fig. 76, 5 µm (use for Figs 76–82); Fig. 84, 1 µm (use for Figs 83–86). Figs 76, 77. Live cells viewed by LM, showing lobed paretial plastid. Figs 78–82. Cleaned frustules viewed by LM, showing valve margin and thickened raphe/sternum. Figs 83–86. SEM of cleaned and partially cleaned valves (numerous thin copulae visible in Fig. 83).
FIGURE 13–41 in Small diatoms (Bacillariophyta) in cultures from the Styx River, New Zealand, including descriptions of three new species
FIGURE 13–41. Planothidium spp. from the Styx River. Scales: Fig. 17, 5 µm (use for 13–20, 26–39); others 1 µm. Figs 13–25. Planothidium frequentissimum strain LCR-S:2:1:1, CHR618407. Figs 13–20, Cleaned frustules viewed by LM; Figs 13–15, araphid valve showing horseshoe structure; Figs 16–18, raphid valve (vertical pairs are through-focus images of the same frustules). Figs 19, 20, variation seen in girdle view, with convex araphid valve and concave raphid valve. Figs 21–25, SEM of cleaned frustules. Fig. 21, raphid valve; Fig. 22, araphid valve with horseshoe visible; Fig. 23, internal view of araphid valve showing structure of horseshoe; Fig. 24, internal view of half of raphid valve; Fig. 25, araphid valve with depressed pseudoraphe. Figs 26–41. Planothidium victori strain LCR-S:18:1:1, CHR618408. Figs 26–39, cleaned frustules viewed by LM; Figs 26–31, araphid valve showing horseshoe structure and curved valve margin especially in smaller valves; Figs 32–37, raphid valve (vertical pairs are through-focus images of the same frustules); Fig. 38, small araphid valve with horseshoe and hooked apex showing that the valve hook can occur at either end with respect to the horseshoe (compare with 30, 31); Fig. 39, girdle view showing convex araphid valve and concave raphid valve. Figs 40, 41, SEM of cleaned frustules. Fig. 40, araphid valve with horseshoe attachment visible; Fig. 41, oblique view of raphid valve.
FIGURE 1 in Small diatoms (Bacillariophyta) in cultures from the Styx River, New Zealand, including descriptions of three new species
FIGURE 1. Location of sample sites (numbered circles) in the Styx catchment. Light grey lines are major roads, and hashed areas are urbanised (mostly residential properties). Inset map shows the location of the Styx River in New Zealand.
FIGURE 112–129 in Small diatoms (Bacillariophyta) in cultures from the Styx River, New Zealand, including descriptions of three new species
FIGURE 112–129. Eolimna krummensis, strain LCR-S:10:2:1, CHR618418. Scales: Fig 112, 10 µm; Fig. 120, 5 µm (use in Figs 113–120); Fig. 121, 1 µm; Fig. 122, 1 µm (use in Figs 122–129). Fig. 112. Live cells viewed by LM, showing plastids which are typically paired and appressed to valve margins. Figs 113–120. Cleaned frustules viewed by LM, showing size variation and central thickening (girdle view in Fig. 120, showing planar valve faces). Figs 121–129. Cleaned frustules viewed by SEM. Fig. 121, frustule ends in valve and slightly oblique girdle views, showing planar valve faces and larger areolae adjacent to raphe; Figs 122–125, valves in which the size gradient of areolae is much reduced or absent (internal view in Fig. 125); Figs 126–129, valves in which the areolae adjacent to the raphe are distinctly larger than those towards the margin (internal view in Fig. 129).
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