Fragilaria rinoi sp. nov. (Fragilariales, Fragilariophyceae) from periphytic river samples in Central Portugal

  • Cristina Delgado Department of Biology and GeoBioTec - GeoBioSciences, GeoTechnologies and GeoEngineering Research Centre, University of Aveiro, Campus de Santiago, 3810-193, Aveiro
  • M. Helena Novais Instituto de Ciências da Terra (ICT), Polo da Universidade de Évora, Rua Romão Ramalho n° 59, 7000-671 Évora
  • Saúl Blanco Department of Biodiversity and Environmental Management, University of Leon, The Institute of Environment, La Serna, 58, 24007 Leon
  • Salomé F.P. Almeida Department of Biology and GeoBioTec - GeoBioSciences, GeoTechnologies and GeoEngineering Research Centre, University of Aveiro, Campus de Santiago, 3810-193, Aveiro
DOI: https://doi.org/10.5852/ejt.2016.248
Keywords: diatoms, periphyton, Fragilaria, new species, Portugal, rivers

Abstract

A new benthic freshwater diatom, Fragilaria rinoi Almeida & C.Delgado sp. nov., is described from river periphyton samples in Portugal. Fragilaria rinoi sp. nov. is illustrated and discussed based on populations collected from the Vouga, Mondego and Lis river basins in central Portugal and compared with the type material of Fragilaria vaucheriae (Kütz.) J.B.Petersen. The morphological features of the new diatom species are documented through light and scanning electron micrographs, including a comparative analysis with related species of the genus (F. candidagilae Almeida, C.Delgado, Novais & S.Blanco, F. intermedia Grunow in Van Heurck, F. neointermedia Tuji & D.M.Williams, F. recapitellata Lange-Bert. & Metzeltin, F. perminuta (Grunow) Lange-Bert., F. vaucheriae and F. microvaucheriae C.E.Wetzel & Ector). Fragilaria rinoi sp. nov. is characterized by solitary cells without spines, lanceolate valves with slightly rostrate apices, a narrow, linear axial area, and a large, unilateral central area.
Fragilaria rinoi sp. nov. may be confused with F. microvaucheriae in terms of length, striae density and outline, although a morphometric analysis revealed that F. rinoi sp. nov. is significantly wider. Fragilaria rinoi sp. nov. is present in rivers with high dissolved oxygen concentrations, medium to high conductivity, neutral to slightly alkaline pH and high mean values of nitrates and ammonium.

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Published
2016-12-02
How to Cite
Delgado, C., Novais, M. H., Blanco, S., & Almeida, S. F. (2016). Fragilaria rinoi sp. nov. (Fragilariales, Fragilariophyceae) from periphytic river samples in Central Portugal. European Journal of Taxonomy, (248). https://doi.org/10.5852/ejt.2016.248
Issue
No. 248 (2016): Fragilaria rinoi sp. nov. (Fragilariales, Fragilariophyceae) from periphytic river samples in Central Portugal
Section
Botany
Copyright (c) 2016 Cristina Delgado, M. Helena Novais, Saúl Blanco, Salomé F.P. Almeida

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