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Type: Article
Published: 2020-11-10
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Gomphonema alavariense sp. nov. (Cymbellales, Gomphonemataceae) from an urban pond

Department of Ecology and Animal Biology, University of Vigo, Spain
Department of Biology and GeoBioTec-GeoBioSciences, GeoTechnologies and GeoEngineering Research Centre, University of Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal
Departamento de Biodiversidad y Gestión Ambiental, Facultad de Ciencias Biológicas y Ambientales, Universidad de León, Campus de Vegazana s/n, 24071, León, España. Current address: Laboratorio de diatomología y calidad de aguas. Instituto de Investigación de Medio Ambiente, Recursos Naturales y Biodiversidad. La Serna 58, 24007, León, España
Department of Ecology and Animal Biology, University of Vigo, Spain
Algae diatom epilithon phytobenthos Portugal urban pond


Gomphonema alavariense sp. nov. is a new freshwater diatom described in Portugal from phytobenthos samples in an urban pond located in Aveiro (Portugal). This new diatom is illustrated and discussed based on different samples collected in July–August 2017 from Santo António Park pond in the city centre. This taxon was compared with other Gomphonema taxa and the morphological features are documented through light and scanning electron micrographs. Gomphonema alavariense sp. nov. is characterized by showing solitary cells, rhombic-lanceolate to lanceolate valves with rounded apices, a narrow, linear axial area, and slightly asymmetrical central area. This taxon may be confused with G. affine var. rhombicum in terms of length, striae density and outline. Gomphonema alavariense sp. nov. was present in freshwater with low dissolved oxygen concentrations, high conductivity, neutral to slightly alkaline pH and high nitrate concentrations.


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