Fottea 2020, 20(1):98-103 | DOI: 10.5507/fot.2019.019

Nagumoea serrata, a new diatom species (Bacillariophyceae) found on seagrass from the south-eastern coast of Africa (Indian Ocean)

Roksana Majewska1,2*, Bart Van de Vijver3,4
1 Unit for Environmental Sciences and Management, School of Biological Sciences, North-West University, Potchefstroom 2520, South Africa; *Corresponding author e-mail: roksana.majewska@nwu.ac.za
2 South African Institute for Aquatic Biodiversity (SAIAB), Grahamstown 6140, South Africa
3 Meise Botanic Garden, Research Department, Nieuwelaan 38, B-1860 Meise, Belgium
4 University of Antwerp, Department of Biology, ECOBE, Universiteitsplein 1, B-2610 Wilrijk, Antwerpen, Belgium

A novel diatom species belonging to the genus Nagumoea is described based on detailed light and scanning electron microscopy observations. The new taxon was found abundantly in several samples collected from seagrass on the southernmost coasts of Mozambique, Southern Africa. While the new species shows characters (e.g. scalariform valvocopula, fibulae of complex shape and structure) consistent with the genus description, it differs distinctly from currently known members of Nagumoea. Differences include generally larger (7-29 µm) and more slender (1.0-1.5 µm) valves with acutely rounded apices and 4-5 areolae per stria, a doubly-perforated valvocopula, and the last-formed copula with a highly regular serrated margin. Based on the current knowledge and understanding of the diatom morphology and phylogeny, Anaulus vallus Nikolaev, previously included within the genus Denticula, is transferred to the genus Nagumoea. This brings the current number of the genus members to five. Ecological preferences of Nagumoea are briefly discussed.

Keywords: Anaulus, Cymodocea, Denticula vallus, epiphytic diatom, morphology, Mozambique, Nagumoea, new species, seagrass, taxonomy

Received: October 7, 2019; Accepted: November 20, 2019; Prepublished online: February 20, 2020; Published: April 1, 2020  Show citation

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Majewska, R., & Van de Vijver, B. (2020). Nagumoea serrata, a new diatom species (Bacillariophyceae) found on seagrass from the south-eastern coast of Africa (Indian Ocean). Fottea, 20(1), 98-103. doi: 10.5507/fot.2019.019
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