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-a-e. Hantzschia elongata -a-d. valves in LM; e. valve in SEM. f. H. yili -valve in LM. Bars: a-d, f = 10 µm; e = 2 µm.
Source publication
Diatoms constitute a representative portion of the algal community of freshwater aquatic environments, but their studies are centered mostly in the south and southern regions of Brazil, making the microalgae biodiversity of water bodies in the semiarid practically unknown. In the state of Ceará, the few records of the Bacillariaceae are centered in...
Contexts in source publication
Context 1
... elongata (Hantzsch) Grunow, Monthly Microscopical Journal, London, v. 18 p.174, pls 193-196, 1877. Basionym: Nitzschia vivax var. elongata Hantzsch, Hedwigia v. 2, n. 7, p. 1-40, pl. 6, 1860. Fig. 5a-e At LM the valves are dorsiventral with convex dorsal margin and concave ventral margin. Apices attenuated, subcapitate. Length 99.4-222.7 µm, breadth 5.9-10.3 µm. Fibulae delicate, not equidistant, 6-8 in 10 μm, and the two medians farther apart than the others. Striae paralell, 16-18 in 10 µm. Length/breadth ratio: 26.2-30 μm. (n = ...
Context 2
... Vetenskaps-Akademiens Handlingar v.17, p.70, pl.7, 1880. Fig. 6k-t At LM the valves are eliptic-lanceolate with narrowly rostrated apices (Fig. 5j-s). Length, 14.8-17.1 µm, breadth 4.6-5.5 µm. Fibulae faintly distinguishable, 17-19 in 10 µm. Striae uniseriate, equidistant, 17-19 in 10 μm, parallel to slightly curved in the apices, formed by rounded areolae. Longitudinal fold barely visible. (n = 12). valve shape and dimensions (lenght 12.5-30 µm, breadth 3.5-8 µm) and the striae ...
Context 3
... and larger measures of length (34 µm) and width (18,5 µm) and density of striae (9 in 10 µm) (Potapova et al. 2022), justifying the species taxonomic level in T. balatonis. Fig. 6u-w At LM the valves are linear with slightly concave margins in the median region, more noticeable on the fibular margin, with wedgeshaped, subrostraste apices ( Fig. 5t-x). Length 35.1-55.5 µm, width 6.5-7.1 µm. Fibulae distinct, 9-11 at 10 µm and the two medians further apart than the others. Parallel transapical ribs 17-20 at 10 µm. Striae parallel on valve extension to slightly curved at apices, 17-20 at 10 m. Areolae indistinct in LM. Longitudinal fold barely visible. (n = 4). (Fig. 6a-l) valve ...
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