Pinnularia laucensis Lange-Bertalot (2000: 200)

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 : 253

** Pinnularia laucensis Lange-Bertalot (2000: 200)

Figs 9 : J–K

Length: 15.5–26.3 µm; width: 3.6–4.5 µm; striae: 12–15 in 10 µm (n = 23)

Taxonomical remarks: This taxon was originally described from high-altitude (4000 m) and acidic (pH = 5) river samples from Chile ( Rumrich et al. 2000). The individuals found in Cascavel river micro-watershed are similar to Pinnularia laucensis , except for being slightly larger than the original description (length: 13–20 µm; width: 3.3–4 µm), but similar striae density (11–14 in 10 µm). Pinnularia sinistra Krammer (1992: 105) , the most similar taxon, can be differentiated by the subrostrate apices and more radiate striae ( Krammer 1992).

Teratological form: not observed.

Figures

FIGURE 9. Epilithic diatoms from Cascavel River micro-watershed in LM. A–B. Pinnularia graciloides var. latecapitata. B. Teratological valve. C. P. graciloides var. triundulata. D. P. viridiformis. E. P. tabellaria. F–G. P. subgibba var. undulata. H. P. subgibba. I. P. stidolphii. J–K. P. laucensis. L–M. P. certa. N. P. microstauron var. rostrata. O. P. subcapitata. P. P. subanglica. Q. P. meridiana. R. P. rumrichae. S–T. P. obscura. U. P. schoenfelderi. V. P. joculata. W. Fallacia insociabilis. X–Y. Sellaphora nigri. Z. S. laevissima. AA. S. rhombicarea. AB. S. pupula. AC–AF. S. saugerresii. AD–AF. Teratological valves. AG. S. sassiana. AH. S. tridentula. AI. Diploneis subovalis. AJ. Caloneis hyalina. AK. C. westii. AL–AM. C. bacillum. AM. Teratological valve. Scale bars: 10 µm.