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Issue: Vol. 456 No. 1: 19 August 2020
Type: Article
Published: 2020-08-19
DOI: 10.11646/phytotaxa.456.1.8
Page range: 105–113
Abstract views: 23
PDF downloaded: 2

Brachysira aristidesii sp. nov. (Bacillariophyceae, Brachysiraceae): a new species from oligotrophic and mesotrophic tropical reservoirs in southeastern Brazil

Instituto de Botânica, Department of Ecology, Av. Miguel Estéfano 3687, 04301-902, São Paulo, SP, Brazil.
Instituto de Botânica, Department of Ecology, Av. Miguel Estéfano 3687, 04301-902, São Paulo, SP, Brazil. Universidade Estadual Paulista “Júlio de Mesquita Filho” – UNESP, Av. 24A, 1515, 13506-900, Rio Claro, SP, campus Rio Claro, SP, Brazil.
Water Laboratory, University of Évora, P.I.T.E. Rua da Barba Rala No. 1, 7005–345 Évora, Portugal. Institute of Earth Sciences - ICT, University of Évora, Rua Romão Ramalho 59, 7000–671 Évora, Portugal.
Instituto de Botânica, Department of Ecology, Av. Miguel Estéfano 3687, 04301-902, São Paulo, SP, Brazil. Universidade Estadual Paulista “Júlio de Mesquita Filho” – UNESP, Av. 24A, 1515, 13506-900, Rio Claro, SP, campus Rio Claro, SP, Brazil.
Autecology diatom inland waters surface sediment taxonomy Algae

Abstract

A new diatom species, Brachysira aristidesii sp. nov., is described from three oligotrophic and mesotrophic reservoirs in Piracicaba River basin, State of São Paulo, Brazil. Descriptions are based on light and scanning electron microscopy. The new species is mainly characterized by rhombic-lanceolate valves with strongly capitated ends, filiform and straight raphe, narrow and linear axial area, slightly radiate striae and transapically elongated areolae. It is compared to Brachysira microcephala, B. silvicola, B. vitrea, B. neoexilis and Nupela brachysiroides. Our findings suggest that Brachysira aristidesii is a species mainly associated to high water transparency, low to moderate conductivity, slightly acidic and low nutrient environments.