NEW AND INTERESTING NAVICULA TAXA FROM WESTERN AND NORTHERN EUROPE

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.