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Issue: Vol. 606 No. 3: 31 Jul. 2023
Type: Article
Published: 2023-07-31
DOI: 10.11646/phytotaxa.606.3.2
Page range: 185-200
Abstract views: 189
PDF downloaded: 16

Taxonomy of three new Neidium Pfitzer species of the Arapiuns and Tapajós Rivers Basin (Santarém, Pará, Brazil)

Universidade Federal do Oeste do Pará; Instituto de Ciências e Tecnologia das Águas; Curso Bacharelado em Ciências Biológicas. Avenida Vera Paz; s/n - Bairro Salé; CEP 68.035-110; Santarém; Pará; Brasil
Universidade Federal do Oeste do Pará; Instituto de Ciências e Tecnologia das Águas; Curso Bacharelado em Ciências Biológicas. Avenida Vera Paz; s/n - Bairro Salé; CEP 68.035-110; Santarém; Pará; Brasil
Programa de Pós-Graduação em Sociedade, Natureza e Desenvolvimento, Universidade Federal do Oeste do Pará
Museum of Natural History and Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, CO 80309 USA
Museu de Ciências Naturais, Secretaria do Meio Ambiente e Infraestrutura, Porto Alegre, Rio Grande do Sul, Brasil
Universidade Federal do Oeste do Pará, Instituto de Ciências e Tecnologia das Águas, Curso Bacharelado em Ciências Biológicas. Avenida Vera Paz, s/n - Bairro Salé, CEP 68.035-110, Santarém, Pará, Brasil; Programa de Pós-Graduação em Sociedade, Natureza e Desenvolvimento, Universidade Federal do Oeste do Pará
Algae Amazonian environments biodiversity diatoms morphology new species

Abstract

During our investigations on the taxonomy of diatoms of clear water habitats in the western Pará region, we found three interesting, previously undocumented Neidium species. This study was based on samples taken from different habitats (plankton and sediment) in the Arapiuns and Tapajós Rivers, as well as three lakes. Based on light and scanning electron microscope observations, three new Neidium are distinguished from one another and their congeners by differences in valve outline, stria density, striation pattern, number and position of longitudinal canals and external proximal raphe endings. Furthermore, we provide formal descriptions of these new species and compare them with others similar species. We also discuss variation in several features of taxa currently assigned to the genus Neidium.

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