Fragilaria spectra P.D.Almeida, E.Morales & C.E.Wetzel (2016: 174)

Amaral, Mailor Wellinton Wedig, Medeiros, Gabriela, Daufenbach, Vanessa, Sampaio, Silvio Cesar, Reis, Ralpho Rinaldo Dos, Ludwig, Thelma Alvim Veiga & Bueno, Norma Catarina, 2024, Taxonomy of epilithic diatoms and teratological forms under the presence of metals in surface sediment, Phytotaxa 647 (3), pp. 237-273 : 243

publication ID	https://doi.org/10.11646/phytotaxa.647.3.3
DOI	https://doi.org/10.5281/zenodo.14743429
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scientific name	Fragilaria spectra P.D.Almeida, E.Morales & C.E.Wetzel (2016: 174)
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* Fragilaria spectra P.D.Almeida, E.Morales & C.E.Wetzel (2016: 174)

Figs 3 View FIGURE 3 : AP–AR

Length: 42.7–70.1 µm; width: 1.8–3.1 µm; striae: 19–24 in 10 µm (n = 12)

Taxonomical remarks: the individuals found in our samples presented greater width (1.8–3.1 × 1.5–2.5 µm) and lower striae density (19–24 × 24–25 in 10 µm) in comparison to the original description ( Almeida et al. 2016), however, the delicate appearance of the valves is similar. In our samples, Fragilaria tenera (Smith) Lange-Bertalot (1980: 746) was distinguished by lower striae density (15–16 in 10 µm) and Fragilaria tenera var. nanana by the capitate apices ( Lange-Bertalot & Ulrich 2014, Almeida et al. 2016).

References

Almeida, P. D., Morales, E. A., Wetzel, C. E., Ector, L. & Bicudo, D. de C. (2016) Two new diatoms in the genus Fragilaria Lyngbye (Fragilariophyceae) from tropical reservoirs in Brazil and comparison with type material of F. tenera. Phytotaxa 246: 163 - 183. https: // doi. org / 10.11646 / phytotaxa. 246.3.1

Lange-Bertalot, H. (1980) Zur systematischen Bewertung der bandformigen Kolonien bei Navicula und Fragilaria. Kriterien fur die Vereinigung von Synedra (subgen. Synedra) Ehrenberg mit Fragilaria Lyngbye. Nova Hedwigia 33: 723 - 787.

Lange-Bertalot, H. & Ulrich, S. (2014) Contributions to the taxonomy of needle-shaped Fragilaria and Ulnaria species. Lauterbornia 78: 1 - 73.

Figures

FIGURE 3. Epilithic diatoms from Cascavel River micro-watershed in LM. A. Stephanocyclus meneghinianus. B. Cyclotella kingstonii. C–E. Discostella stelligera. D–E. Teratological valves. F. Melosira varians. G. Orthoseira roeseana. H. Aulacoseira ambigua. I. A. brasiliensis. J. A. granulata var. angustissima. K. A. granulata. L–N. A. pusilla. O–Q. A. tenella. R–T. Fragilaria fragilarioides. U–AA. F. radians. X–AA. Teratological valves. AB–AH. F. pectinalis. AE–AH. Teratological valves. AI–AK. F. tenera. AL–AO. F. tenera var. nanana. AN–AO. Teratological valves. AP–AR. F. spectra. AS–AT. Fragilariforma javanica. AU. Ulnaria contracta. AV. U. delicatissima. AW–AZ. U. ulna. AX–AZ. Teratological valves. Scale bars: 10 µm.