Abstract
Nine Navicula species observed in European rivers and lakes are discussed using light and scanning electron microscopy. Four of them are described as new species: Navicula antverpiensis Van de Vijver & Lange-Bertalot sp. nov., N. wendlingii Lange-Bertalot, Hofmann & Van de Vijver sp. nov., N. lacuum Lange-Bertalot, Hofmann, Werum & Van de Vijver sp. nov. and Navicula suecicarum Van de Vijver, Jarlman & Lange-Bertalot. The taxonomy of five other, already established, taxa is investigated: Navicula neomundana(Lange-Bertalot) Van de Vijver, Jarlman & Lange-Bertalot stat. nov., Navicula simulata Manguin syn. Navicula symmetrica Patrick, Navicula schroeteri Meister s. str. and N. escambia (Patrick) Metzeltin & Lange-Bertalot. The ecological preferences and distribution for each species are briefly discussed. Navicula veneta Kützing is formally lectotypified.
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