FIGURES 17‒22 in Two new Stauroneis species (Bacillariophyta, Stauroneidaceae) from midwestern karstic Brazilian formations

FIGURES 17‒22. Stauroneis cavalcantei Tremarin, Tusset & T. Ludwig sp. nov. SEM. Figs 17‒18. External and internal valve view, respectively. Figs 19. Internal view of central area showing the stauros and the proximal raphe endings. Fig. 20. External view of central area showing the striation pattern and the proximal raphe endings. Fig. 21. Internal view of valve apex, note the helictoglossa. Fig. 22. External view of valve apex showing the distal raphe endings. Scale bars = 5 μm (Figs 19, 20), 2 μm (Figs 17, 18, 21, 22).

Published as part of Tusset, Eduardo A., Tremarin, Priscila I. & Ludwig, Thelma A.V., 2018, Two new Stauroneis species (Bacillariophyta, Stauroneidaceae) from midwestern karstic Brazilian formations, pp. 265-277 in Phytotaxa 358 (3) on page 270, DOI: 10.11646/phytotaxa.358.3.4, http://zenodo.org/record/13703084

Keywords

Chromista, Bacillariophyceae, Ochrophyta, Naviculaceae, Biodiversity, Naviculales, Stauroneis, Taxonomy

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