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Issue: Vol. 239 No. 3: 24 December 2015
Type: Article
Published: 2015-12-24
DOI: 10.11646/phytotaxa.239.3.9
Page range: 280–286
Abstract views: 41
PDF downloaded: 95

Pinnularia caprichosa sp. nov.: a diatom from a black water Brazilian Amazon system

Universidade Federal do Rio Grande do Sul, Programa de Pós-Graduação em Botânica Universidade Federal do Oeste do Pará, Instituto de Ciências e Tecnologia das Águas, Av. Vera Paz, s/n - Bairro Salé, CEP 68.035-110, Santarém, Pará, Brazil
Fundação Zoobotânica do Rio Grande do Sul, Rua Salvador França, 1427, CEP 90690-000, Porto Alegre, Rio Grande do Sul, Brazil
Universidade Federal do Oeste do Pará, Instituto de Ciências e Tecnologia das Águas, Av. Vera Paz, s/n - Bairro Salé, CEP 68.035-110, Santarém, Pará, Brazil
Museum of Natural History and Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, CO 80309, U.S.A.
Luxembourg Institute of Science and Technology (LIST), Environmental Research and Innovation (ERIN) Department, 41 rue du Brill, L-4422 Belvaux, Grand-duchy of Luxembourg
Luxembourg Institute of Science and Technology (LIST), Environmental Research and Innovation (ERIN) Department, 41 rue du Brill, L-4422 Belvaux, Grand-duchy of Luxembourg
Universidade Federal do Oeste do Pará, Instituto de Ciências e Tecnologia das Águas, Av. Vera Paz, s/n - Bairro Salé, CEP 68.035-110, Santarém, Pará, Brazil
Bacillariophyta Pinnularia taxonomy Amazonian region South America scanning electron microscopy Algae Brazil

Abstract

While possessing a remarkable diversity in the acidic and oligotrophic waters of the Amazon basin, the genus Pinnularia appears underdescribed in the region. In this study, we present light and scanning electron microscopical observations on Pinnularia caprichosa sp. nov. from Tupé Lake, a dendritic lake located on the floodplain of the Negro River basin. This new taxon has a large axial area and transapical striae that are slightly radiate to parallel and longer in the middle portion of the valve. The species was compared with Pinnularia elliptica, P. instabilis, P. lacunarum, P. montana, P. permontana and P. subflexuosa, all of which closely resemble P. caprichosa but differ from the new species in specific details of size, striae density and valve shape.