New species and combinations on Fragilariforma (Bacillariophyta) from tropical freshwater environments

Author(s)

Almeida, Pryscilla D. ^{[1, 2]} ; Wetzel, Carlos E. ^[3] ; Morales, Eduardo A. ^[4] ; Ector, Luc ^[3] ; Bicudo, Denise C. ^[1]

Affiliation

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

^[2] Museu Paraense Emilio Goeldi, Programa Capacitacao Inst, Coord Ciencias Terra & Ecol, Campus Pesquisa, Av Perimetral 1901, BR-66077830 Belem, Para - Brazil

^[3] Luxembourg Inst Sci & Technol, Environm Res & Innovat Dept ERIN, 41 Rue Brill, L-4422 Belvaux - Luxembourg

^[4] Calle Andres Uzeda 358, Colcapirhua, Cochabamba - Bolivia

• Document type: Journal article
• Source: Fottea; v. 17, n. 2, p. 277-292, 2017.
• Web of Science Citations: 1

Abstract

Several species currently belonging to the genus Fragilariforma D.M. WILLIAMS et ROUND are known worldwide. This genus is mainly characterized by regular spacing of the uniseriate striae composed of round areolae bearing simple vela, and simple apical pore fields. A large number of species has been recognised for some regions of South America and tropical Africa, but few studies encompass type material and/or the morphological variation existing within populations of the different species. The aim of this study is to identify and describe the morphology of these species from tropical environments under light and scanning electron microscopy and using available type material. Nomenclatural issues are examined and clarified for five taxa: Fragilaria nitzschioides var. brasiliensis GRUNOW, F. undata var. brasiliensis C. ZIMMERMANN, F. strangulata (ZANON) D.M. WILLIAMS et ROUND, F. telum J.R. CARTER et DENNY and F. rolandschmidtii METZELTIN et LANGE-BERTALOT. The type material of F. nitzschioides var. brasiliensis, housed in the Grunow Collection at the Naturhistorisches Museum Wien (W) was examined and its epitypification is proposed. One new species from the Amazon region Fragilariforma amazonica sp. nov. is presented and described here, while Fragilaria telum is formally transferred to the genus Fragilariforma. (AU)

• FAPESP's process: 14/13179-1 - Araphid pennate diatoms: taxonomy and ecology of representatives of the genera Fragilaria, Fragilariforma, Synedra and Ulnaria in the State of São Paulo
• Grantee: Pryscilla Denise Almeida da Silva
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 09/53898-9 - Paleolimnological reconstruction of Guarapiranga Reservoir and diagnosis of water and sediment current quality of SPMR water supply reservoirs facing their management
• Grantee: Carlos Eduardo de Mattos Bicudo
• Support Opportunities: Research Projects - Thematic Grants