Fottea 2017, 17(2):277-292 | DOI: 10.5507/fot.2017.006

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

Pryscilla D. Almeida1,2 *, Carlos E. Wetzel3, Eduardo A. Morales4, Luc Ector3, Denise C. Bicudo1
1 Instituto de Botânica de São Paulo, Department of Ecology, Av. Miguel Stefano 3687, 04301-902, São Paulo, SP, Brazil; *Corresponding author e-mail: pryalmeida@gmail.com
2 Programa de Capacitação Institucional, Museu Paraense Emílio Goeldi, Campus de Pesquisa, Coord. Ciências da Terra e Ecologia, Av. Perimetral, 1901, Terra Firme, 66077-830, Belém, PA, Brasil
3 Luxembourg Institute of Science and Technology (LIST), Environmental Research and Innovation Department (ERIN), 41 rue du Brill, L-4422 Belvaux, Luxembourg
4 Independent Consultant. Calle Andrés Uzeda 358, Colcapirhua, Cochabamba, Bolivia

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.

Keywords: Africa, Brazil, diatoms, Grunow Collection, morphology, taxonomy, type material, ultrastructure

Received: October 31, 2016; Accepted: February 13, 2017; Prepublished online: August 23, 2017; Published: September 20, 2017  Show citation

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Almeida, P.D., Wetzel, C.E., Morales, E.A., Ector, L., & Bicudo, D.C. (2017). New species and combinations on Fragilariforma (Bacillariophyta) from tropical freshwater environments. Fottea, 17(2), 277-292. doi: 10.5507/fot.2017.006
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