New records ofNaviculasensu stricto from Serbia with taxonomic notes and autecological characterization ofNavicula splendiculaandN. moskalii

Abstract

A total of 15 Navicula taxa were recorded in epilithic communities occurring in seven rivers of Serbia, all of which are new to the diatom flora of Serbia. The most interesting of them are N. splendicula and N. moskalii. When observing N. splendicula specimens under SEM, we noticed a characteristic silicate tongue in the center of raphe ends, which had not been previously reported in the available literature. The insufficiently researched distribution of N. moskalii and scarce autecological information on the taxon prompted us to provide new details about the species in this study. These findings clearly indicate the need for further comprehensive research that would provide new information on rare taxa.

Taxonomic and ecological characterization of three symmetric biraphid diatom species from streams in Cyprus

“…In the literature there are plenty of examples of identification and definition of features for correct distinction between similar taxa, new combinations, and new species descriptions (e.g., Sabbe et al 2019;Chudaev et al 2021). This richness is also explained by the wealth of diverse habitats colonized, however with a predominance of freshwater diatoms (Kociolek & Spaulding 2003;Wehr & Sheath 2003;Dobosz et al 2017;Vidakovic et al 2020). Valves of Navicula s.s. are elliptic and boat-shaped in outline.…”

“…Navicula species occur across a wide range of ecosystems (low-conductivity waterbodies, wetlands, brackish, and marine waters, etc.) (Lange-Bertalot 2001;Watanabe 2004;Vidakovic et al 2020). However, the great majority of Navicula taxa have eco-specific characteristics enabling them to play a major role in biomonitoring (Werum & Lange-Bertalot 2004;Metzeltin & Lange-Bertalot 2007).…”