Eunotia dorofeyukiae Lange-Bert. & Kulikovskiy in Kulikovskiy et al. 2010b: p. 29, 65, pl. 20/figs 1-6. *^

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 : 6

Eunotia dorofeyukiae Lange-Bert. & Kulikovskiy in Kulikovskiy et al. 2010b: p. 29, 65, pl. 20/figs 1-6. *^ Figs 28 , 28a , 29 (SEM)

Illustrations.

Krammer and Lange-Bertalot 1991: pl. 143/figs 22-23 (as Eunotia circumborealis Nörpel & Lange-Bert.); Rivera-Rondón and Catalan 2017: pl. 25/figs 7-9.

Diagnosis.

Morphometric data: length 33-35 µm, width cm 7, p5-8 µm; striae density c12-14, p18-22 in 10 µm. Lange-Bertalot et al. 2010: length 37-58 µm, width 7.3-8.7 µm, striae density 10-13 in 10 µm.

Frustule bi-symmetric, bipolar, biraphid with mirror-symmetric, mantle-offset, brevisslit type of raphe. Valves dorsiventral, with undulate dorsal margin and weak depression in its central part, slightly concave ventral side and subcapitate broad rounded poles. Striae basal, uniserial, distant, denser at the poles. Areolae small with round outer foramina (Fig. 28a ). Raphe system consists of two short filiform slits on ventral valve mantle, distal ends of slits finish on external valve surface on ventral pole corners by small round pore outers (Fig. 28a ) connected with small helictoglossae (Fig. 29 ); tr-fissures absent.

Ecology.

Freshwater epiphytic species, often collected on different Sphagnum species, occurs in acidic (pH 5.5-5.6), oligotrophic waters with low electric conductivity and buffered by humic acids. The specimens from Type population were collected at 11-13 °C ( Kulikovskiy et al. 2010b).

Distribution.

ASIA: Type location: northern Mongolia, Nur bog ( Kulikovskiy et al. 2010b); Russia ( Kulikovskiy et al. 2016). EUROPE: Scandinavia ( Krammer and Lange-Bertalot 1991 (as E. circumborealis ); Germany ( Kulikovskiy et al. 2010b); Ukraine (present paper); France, Pyrenees, Lake Mariola ( Rivera-Rondón and Catalan 2017). AUSTRALIA: Tasmania (M. Guiry in Guiry and Guiry 2019). In Ukraine. The Cheremsky Nature Reserve, tract Obkopane, ditch, epiphyton on Sphagnum sp.

Comments.

Illustrations of this species in Kulikovskiy et al. (2010b: pl. 20/figs 1-6) are not uniform in valve outline.

This species was described from a mountainous region with a harsh climate and was recorded later in a mountain lake in the Pyrenees. In Ukraine it inhabits in a flatland bog.

Figures

Figures 28 - 35. Species of Eunotia Ehrenb. from the Cheremsky Nature Reserve. 28, 28 a, 29 Eunotia dorofeyukiae Lange-Bert. & Kulikovskiy 28 a arrow indicates pore outer on the raphe slit distal end 29 arrow indicates rimoportula at the venral corner of pole where raphe slit distal end finishes on the outer valve surface 30, 30 a Eunotia neocompacta S. Mayama 30 a arrow indicates rimoportula at the venral corner of pole, absence of a hyaline field indicates absence of terminal fissure 31 Eunotia praerupta Ehrenb. 32 Eunotia sp. 6. 33 Eunotia sp. 7. 34, 35 Eunotia tetraodon Ehrenb. Figs 28 - 31 SEM: 28, 28 a outside valve surface; 29 - 31 inside valve surface; 32 - 35 LM. Scale bars: 5 µm (28, 29, 30); 2 µm (28 a); 1 µm (30 a); 10 µm (31 - 34).