Plant Ecology and Evolution 152(2): 293-312, doi: 10.5091/plecevo.2019.1611
Observations of the genus Muelleria (Bacillariophyceae) from the Republic of North Macedonia
expand article infoZlatko Levkov‡, Danijela Vidaković§, Aleksandra Cvetkoska|, Danijela Mitić-Kopanja|, Svetislav Krstić|, Bart Van de Vijver, Paul Hamilton
‡ Faculty of Natural Sciences and Mathematics at the University of Skopije, Skopije, Republic of North Macedonia§ University of Belgrade, Institute of Chemistry, Technology and Metallurgy, Njegoseva 12, 11000 Belgrade, Serbia| Institute of Biology, Faculty of Natural Sciences, Ss Cyril and Methodius University, Arhimedova 3, 1000 Skopje, Republic of North Macedonia¶ Botanic Garden Meise, Meise, Belgium

Corresponding author: Zlatko Levkov ( zlevkov@pmf.ukim.mk )

© Zlatko Levkov, Danijela Vidaković, Aleksandra Cvetkoska, Danijela Mitić-Kopanja, Svetislav Krstić, Bart Van de Vijver, Paul B. Hamilton.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation: Levkov Z, Vidaković D, Cvetkoska A, Mitić-Kopanja D, Krstić S, Van de Vijver B, Hamilton P (2019) Observations of the genus Muelleria (Bacillariophyceae) from the Republic of North Macedonia. Plant Ecology and Evolution 152(2): 293-312. https://doi.org/10.5091/plecevo.2019.1611
Open Access
Abstract

Background and aims – An increased interest in the diatom flora from subaerial habitats in the Republic of North Macedonia has revealed the presence of a large number of interesting and often unknown, species. During a recent biodiversity survey, seven Muelleria species were recorded, several of which could not be identified based on the available literature.

Methods – Using both Light Microscopy and Scanning Electron Microscopy techniques, the morphology of several Muelleria species has been analysed. The morphology of all taxa is described, illustrated and compared with other possible similar Muelleria taxa, known worldwide.

Key results – Four already documented Muelleria species, M. gibbula, M. islandica, M. terrestris and M. undulata (= Navicula gibbula f. undulata) were identified, while two distinct species are described as new. These new species belong to the M. gibbula complex, and can be differentiated by valve size, stria density, shape of the proximal raphe ends and the shape of external areola foramina. The identity of one taxon remains uncertain due to a low number of observed specimens in the samples. As their ultrastructure is almost entirely unknown, they are briefly discussed.

Conclusions – The diversity of Muelleria in Europe and the North Hemisphere is most likely underestimated and some of the previous records of M. gibbula belong to other species. Observations of diatoms from “extreme” habitats such as intermittent ponds, wet mosses and soils can reveal the existence of interesting and new species.

Keywords
diatoms, Muelleria, intermittent ponds, new species, subaerial habitats

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