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Abstract
Mastogloia is one of the few species-rich diatom genera the majority of whose taxa inhabit the marine environment with only a small number of taxa in freshwater habitats. An ongoing revision of the Macedonian diatom flora, mainly over the last decade, has revealed many previously misidentified taxa. Currently, seven freshwater Mastogloia taxa have been recorded from Macedonia: M. elliptica (C. Agardh) Cleve, M. dansei (Thwaites) W. Smith, M. grevillei W. Smith, M. lacustris (Grunow) Grunow, M. ohridana Cvetkoska & Levkov, M. albertii nom. nov. and M. sterijovskii sp. nov. The main morphological features have been analysed with light and scanning electron microscopy. These taxa inhabit a variety of freshwater habitats, including oligotrophic rivers, eutrophic ponds, mine lakes, thermo-mineral springs, with one species from fossil sediments of ancient Lake Ohrid. Mastogloia albertii nom. nov., which we also lectotypify, is a new name for M. smithii var. amphicephala Grunow, since the latter is clearly distinct from the lectotype of M. smithii Thwaites. In addition, one of the observed taxa does not fit within any previously described Mastogloia taxa and is hereby described as a new species, M. sterijovskii. Mastogloia sterijovskii was found as epizoic on the dorsal carapace of the European pond turtle, Emys orbicularis Linnaeus, from the Mladost reservoir near Veles, central Macedonia. This species resembles M. albertii in valve outline, but can be distinguished by the shape of the valve apices and its size.
Acknowledgements
We would like to express our most sincere gratitude to Dragan Arsovski, a devoted herpetologist from Macedonia, for organizing the field trip to the Mladost reservoir near Veles, where the epizoic diatom samples were collected. We are also indebted to Bart Van de Vijver, from the Botanic Garden Meise, Belgium, for examining Slide No. 161 from the P.T. Cleve & J.D. Möller collection and for providing the photographs of the type population of M. albertii. This work was partially funded by the Alexander von Humboldt Foundation from Germany. Elena Jovanovska is supported by the German Research Foundation.
