title: MICROFISSURATA GEN. NOV. (BACILLARIOPHYTA), A NEW DIATOM GENUS FROM DYSTROPHIC AND INTERMITTENTLY WET TERRESTRIAL HABITATS(1).
abstract: A new freshwater benthic diatom genus, Microfissurata gen. nov., was identified from light and scanning electron micrographs. The most characteristic morphological feature (referred to also by the name of the new genus) is the structure of the striae/alveoli, which are simple, mostly uninterrupted, transapical slits. The combination of characteristics of the new genus is unique. It includes two new species: Microfissurata paludosa Cantonati et Lange-Bert. sp. nov. and M. australis Van de Vijver et Lange-Bert. sp. nov., distributed in Europe and on an austral island, respectively. The new genus occurs in freshwater dystrophic lakes, pools, seepage springs, mires, and in intermittently wet terrestrial habitats. It is not abundant but widespread wherever these habitat types are well developed, in Nordic-alpine and sub-Antarctic areas. Overall, the new genus appears to be mostly epiphytic (bryophilous) and capable of tolerating a wide range of moisture conditions (xerotolerant). The finding of the type species (M. paludosa) in a well-investigated area like central Europe highlights the diatom species richness of dystrophic habitats and their importance for diatom biodiversity conservation.
authors.affiliation: Museo Tridentino di Scienze Naturali, Limnology and Phycology Section, Via Calepina 14, I-38100 Trento, ItalyNational Botanic Garden, Department of Bryophyta and Thallophyta, Domein van Bouchout, B-1860 Meise, BelgiumInstitute for Ecology, Evolution, Diversity, University of Frankfurt, Siesmayerstraße 70, and Senckenberg Research Institute, Senckenberganlage 31-33, D-60054 Frankfurt/M., Germany.
authors.forename: Marco
authors.initials: M
authors.lastname: Cantonati
authors.affiliation: Museo Tridentino di Scienze Naturali, Limnology and Phycology Section, Via Calepina 14, I-38100 Trento, ItalyNational Botanic Garden, Department of Bryophyta and Thallophyta, Domein van Bouchout, B-1860 Meise, BelgiumInstitute for Ecology, Evolution, Diversity, University of Frankfurt, Siesmayerstraße 70, and Senckenberg Research Institute, Senckenberganlage 31-33, D-60054 Frankfurt/M., Germany.
authors.forename: Bart
authors.initials: B
authors.lastname: Van de Vijver
authors.affiliation: Museo Tridentino di Scienze Naturali, Limnology and Phycology Section, Via Calepina 14, I-38100 Trento, ItalyNational Botanic Garden, Department of Bryophyta and Thallophyta, Domein van Bouchout, B-1860 Meise, BelgiumInstitute for Ecology, Evolution, Diversity, University of Frankfurt, Siesmayerstraße 70, and Senckenberg Research Institute, Senckenberganlage 31-33, D-60054 Frankfurt/M., Germany.
authors.forename: And Horst
authors.initials: AH
authors.lastname: Lange-Bertalot
keywords: Microfissurata; Microfissurata australis; Microfissurata paludosa; alpine-circumboreal distribution; desiccation; diatoms; dystrophic lakes; epiphyton; intermittently wet terrestrial habitats; mires; pH; pool springs; seepages; temperate sub-Antarctica