Chamaepinnularia salina (Bacillariophyta), a new diatom species from French mineral springs (Massif Central) Author Beauger, Aude 0000-0002-0911-0500 Université Clermont Auvergne, CNRS, GEOLAB, F- 63000 Clermont-Ferrand, France. & LTSER “ Zone Atelier Territoires Uranifères ”, 63000 Clermont-Ferrand, 63178 Aubière Cedex, France. & aude. beauger @ uca. fr; https: // orcid. org / 0000 - 0002 - 0911 - 0500 aude.beauger@uca.fr Author Wetzel, Carlos E. 0000-0001-5330-0494 Luxembourg Institute of Science and Technology (LIST), Environmental Research and Innovation Department (ERIN), Observatory for Climate, Environment and Biodiversity (OCEB), 41 rue du Brill, 4422 Belvaux, Luxembourg. & carlos. wetzel @ list. lu; https: // orcid. org / 0000 - 0001 - 5330 - 0494 carlos.wetzel@list.lu Author Allain, Elisabeth 0000-0002-6411-5873 Université Clermont Auvergne, CNRS, GEOLAB, F- 63000 Clermont-Ferrand, France. & elisabeth. allain @ uca. fr; https: // orcid. org / 0000 - 0002 - 6411 - 5873 elisabeth.allain@uca.fr Author Bertin, Clotilde 0000-0003-3617-817X BRGM, 12 avenue des Landais, 63170 Aubière, France. & c. bertin @ brgm. fr; https: // orcid. org / 0000 - 0003 - 3617 - 817 X c.bertin@brgm.fr Author Voldoire, Olivier 0000-0003-1306-3054 Université Clermont Auvergne, CNRS, GEOLAB, F- 63000 Clermont-Ferrand, France. & olivier. voldoire @ uca. fr; https: // orcid. org / 0000 - 0003 - 1306 - 3054 olivier.voldoire@uca.fr Author Breton, Vincent 0000-0001-8197-7080 LTSER “ Zone Atelier Territoires Uranifères ”, 63000 Clermont-Ferrand, 63178 Aubière Cedex, France. & Université Clermont Auvergne, CNRS / IN 2 P 3, Laboratoire de Physique de Clermont, UMR 6533, 4 avenue Blaise Pascal TSA 60026, CS 60026, 63178 Aubière cedex, France. & BRETON @ clermont. in 2 p 3. fr; https: // orcid. org / 0000 - 0001 - 8197 - 7080 Author Baker, Lory-Anne 0000-0002-8346-8578 LTSER “ Zone Atelier Territoires Uranifères ”, 63000 Clermont-Ferrand, 63178 Aubière Cedex, France. & Université Clermont Auvergne, Laboratoire « Microorganismes: Génome et Environnement » (LMGE), 63178 Aubière Cedex, France. & l-anne. baker @ etu. uca. fr; https: // orcid. org / 0000 - 0002 - 8346 - 8578 l-anne.baker@etu.uca.fr Author Kolovi, Sofia 0000-0003-4778-2823 LTSER “ Zone Atelier Territoires Uranifères ”, 63000 Clermont-Ferrand, 63178 Aubière Cedex, France. & Université Clermont Auvergne, CNRS / IN 2 P 3, Laboratoire de Physique de Clermont, UMR 6533, 4 avenue Blaise Pascal TSA 60026, CS 60026, 63178 Aubière cedex, France. & sofia. kolovi @ clermont. in 2 p 3. fr; https: // orcid. org / 0000 - 0003 - 4778 - 2823 Author Biron, David 0000-0002-6531-4647 LTSER “ Zone Atelier Territoires Uranifères ”, 63000 Clermont-Ferrand, 63178 Aubière Cedex, France. & Université Clermont Auvergne, Laboratoire « Microorganismes: Génome et Environnement » (LMGE), 63178 Aubière Cedex, France. & david. biron @ uca. fr; https: // orcid. org / 0000 - 0002 - 6531 - 4647 david.biron@uca.fr Author Ector, Luc 0000-0002-4573-9445 Luxembourg Institute of Science and Technology (LIST), Environmental Research and Innovation Department (ERIN), Observatory for Climate, Environment and Biodiversity (OCEB), 41 rue du Brill, 4422 Belvaux, Luxembourg. & luc. ector @ list. lu; https: // orcid. org / 0000 - 0002 - 4573 - 9445 luc.ector@list.lu text Phytotaxa 2022 2022-03-03 538 1 55 73 journal article 20294 10.11646/phytotaxa.538.1.5 a0b7fa39-8ca6-42ce-a70f-c48ff3ff25b3 1179-3163 6332002

TABLE 3. Main characteristics of the new Chamaepinnularia and similar small species.

Species	Valve length (µm)	Valve width (µm)	Number of striae in 10 µm	Sternum	Pole shape	Central area shape	Ecology
Chamaepinnularia salina	4–13	2–3	30–40	visible in LM	rounded	rectangular fascia	brackish water (saline lake)
Chamaepinnularia gandrupii (Genkal & Yarushina 2018)	9.0–21.3	1.5–4.7	21–26	not visible in LM	broadly rounded to capitate	elliptical	freshwater/ oligotrophic
Chamaepinnularia gerlackei (Van de Vijver et al. 2010)	12–30	3.3–4.9	17.5–20	not visible in LM	broadly rounded	rhomboid to rectangular	freshwater/ aerophytic
Chamaepinnularia krasskei (Lange-Bertalot & Genkal 1999)	15–27	3.3–4	21–23	not visible in LM	broadly rounded	rhombic lanceolate	freshwater
Chamaepinnularia minutissima (Bourrelly & Manguin 1952)	12	2.5	9	not visible in LM	subrostrate	elliptical	aerophytic
Chamaepinnularia rupicola (Hustedt 1937, Simonsen 1987)	12–14	2.5–3	28–30	not visible in LM	broadly rounded to capitated	rhomboid to rectangular	freshwater/ aerophytic
Microcostatus turritus (Antoniades et al. 2009)	8–9	3	35	visible in LM	rounded	stauros fascia	freshwater/ aerophytic