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Article
Published: 2022-05-12

The identity of Eunotia paludosa Grunow 1862 (Eunotiaceae, Bacillariophyta), a revision, and the description of three new species of Eunotia Ehrenberg

Meise Botanic Garden Meise, Research Department, Nieuwelaan 38, 1860 Meise, Belgium; University of Antwerp, Department of Biology – ECOSPHERE, Universiteitsplein 1, B-2610 Wilrijk, Belgium
Botanisches Institut, Goethe-Universität, Frankfurt am Main, Germany
Meise Botanic Garden Meise, Research Department, Nieuwelaan 38, 1860 Meise, Belgium
Diatomella, IJkelaarstraat 3, 6611 KN Overasselt, the Netherlands
Natural History Museum, Department of Botany, Herbarium, Burgring 7, 1010 Vienna, Austria
Luxembourg Institute of Science and Technology (LIST), Environmental Research & Innovation (ERIN) Department, Observatory for Climate, Environment and Biodiversity (OCEB), 41 rue du Brill, L-4422 Belvaux, Luxembourg
Arctic region Eunotia Europe morphology sub-Antarctica type material Aglae

Abstract

Eunotia paludosa is an abundant and frequent diatom species in ombrotrophic, Sphagnum-dominated bog ponds in Europe. Analysis of the type material from Mandling, Austria, revealed that our currently accepted concept of E. paludosa, based on morphology, was incorrect. The valves in the type population of E. paludosa possess distinct, relatively large, acute spines on the dorsal margin, which are not present in what is currently understood under E. paludosa. Based on the comparison with the E. paludosa type material, three new Eunotia species are described. Eunotia sphagnicola encompasses all European populations formerly and thus incorrectly identified as E. paludosa. The former E. paludosa populations in the sub-Antarctic region are described as E. insularum, a widespread species on almost all sub-Antarctic islands. Finally, E. zackenbergensis was described from Greenland. The three new species differ from each other in valve dimensions, valve outline and shape of the apices.

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