A new Planothidium species (Achnanthidiaceae, Bacillariophyceae) from Xingu Ria, Amazon River basin, Brazil

Author(s)

Morais, Krysna S. ^[1] ; Costa, Livia F. ^[1] ; Bicudo, Carlos E. De M. ^[1] ; Ector, Luc ^[2] ; Wetzel, Carlos E. ^[2]

Affiliation

^[1] Inst Botan, Dept Ecol, Av Miguel Estefano 3687, BR-04301902 Sao Paulo, SP - Brazil

^[2] Luxembourg Inst Sci & Technol LIST, Environm Res & Innovat Dept ERIN, 41 Rue Brill, L-4422 Belvaux - Luxembourg

• Document type: Journal article
• Source: PHYTOTAXA; v. 477, n. 2, p. 194-204, DEC 24 2020.
• Web of Science Citations: 0

Abstract

A new Planothidium species was found in sediment samples (similar to 4,000 yr BP) from the Xingu Ria (Xingu River), Brazilian Amazon The new species morphology was analyzed using light and scanning electron microscopy. Planothidium xinguense sp. nov., is mainly characterized by its elliptical, slightly asymmetrical valves, with strongly marked short rostrate ends in the small specimens, while long and strongly rostrate apices are observable in the larger valves. The taxon belongs to the group of species bearing a cavum on the rapheless valves around the name ``Planothidium rostratum sensu lato{''}. Morphology and ecology of the new species is compared with that of morphologically related taxa. Information of core chronology and the co-occurrence of other diatom species in the sample is also provided. (AU)

• FAPESP's process: 16/02656-9 - The response of sedimentary dynamics of the Xingu and Tapajós rivers to climate changes and hydropower dams: risks for biodiversity conservation and energy production in Amazonia
• Grantee: André Oliveira Sawakuchi
• Support Opportunities: Research Program on Global Climate Change - Regular Grants