Eunotia julma Lange-Bert. in Lange-Bertalot et al. 2011: pl. 7/figs 1-7, 8-10. *^

Bukhtiyarova, Lyudmila N., 2019, The genus Eunotia Ehrenb. (Bacillariophyta) in the Cheremsky Nature Reserve, Ukrainian Polissya, and refined terminology relevant to the raphe system morphology, PhytoKeys 128, pp. 1-31 : 13

Eunotia julma Lange-Bert. in Lange-Bertalot et al. 2011: pl. 7/figs 1-7, 8-10. *^ Figs 7 , 8 , 8a (SEM)

Holotype.

Lange-Bertalot et al. 2011: pl. 7/fig. 1, designated by Lange-Bertalot in Lange-Bertalot et al. 2011.

Illustrations.

Potapova et al. 2014: fig. 1; Kulikovskiy et al. 2016: p. 122, pl. 27/figs 14-17; Bouchard et al. 2018: pl. 1/fig. 1.

Diagnosis.

Morphometric data: length 115-175 µm, width 6 µm, striae density c12, p16 in 10 µm. Lange-Bertalot et al. 2011: length 70-150 µm, 4,5-5 µm, striae density c14, p16 in10 µm.

Frustule bi-symmetric, bipolar, biraphid with mirror-symmetric, mantle-offset, brevisslit type of raphe. Valves dorsiventral, uniform in width, arcuate, with rounded poles. Striae basal, uniserial, distant, evenly spaced (Figs 7 , 8 , 8a ). Areolae small with round outer foramina. Raphe system consists of two short filiform slits on ventral valve mantle; tr-fissures curved on the valve surface, pass along four striae on the middle of valve and end up by round lacunae (Fig. 8a ).

Ecology.

Freshwater epiphytic species.

Distribution.

EUROPE: Type locality: Finland, Lake Julma Olkky near Kuusamo ( Lange-Bertalot et al. 2011); Netherlands (M. Gury in Guiry and Guiry 2019); Ukraine (present paper).?ASIA: Russia, Eastern Siberia ( Potapova et al. 2014); Russia ( Kulikovskiy et al. 2016). N. AMERICA: Canada (Bouchard et al. 2018). In Ukraine. The Cheremsky Nature Reserve, tract Obkopane, ditch, epiphyton on Sphagnum sp.

Comments.

In primary description it is indicated that " … all specimens are consistently curved" ( Lange-Bertalot et al. 2011). Our exemplars correspond to the species Holotype in valve outline and morphometry except our specimens are longer and wider. The illustrations of E. julma in Potapova et al. (2014: fig. 1), Kulikovskiy et al. (2016: pl. 27/figs 14-17), Bouchard et al. (2018: pl. 1/fig. 1) differ from the Holotype by almost straight valves.

Figures

Figures 7 - 12 a. New and rare in Ukraine species of Eunotia Ehrenb. from the Cheremsky Nature Reserve. 7 - 8 a Eunotia julma Lange-Bert. in Lange-Bertalot et al., arrow indicates distal end of raphe slit, double arrow - funnel-like lacuna, terminal fissure is between the arrows 9 Eunotia sp. 1 (cf E. formica Ehrenb.) 10, 11 Eunotia formicina Lange-Bert. in Lange-Bertalot et al. 12, 12 a Eunotia jarensis Lange-Bert. et al., arrow indicates rimoportula. Figs 7, 9 - 11 LM 8, 8 a outside valve surface 12, 12 a inside valve surface, SEM. Scale bars: 10 µm (7 - 17); 3 µm (8 a); 2 µm (12 a).