Eunotia formicina Lange-Bert. in Lange-Bertalot et al. 2011: p. 105-107, pl. 222/figs 1-7, pl. 223/figs 1-7. *^

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 : 6-8

Eunotia formicina Lange-Bert. in Lange-Bertalot et al. 2011: p. 105-107, pl. 222/figs 1-7, pl. 223/figs 1-7. *^ Figs 10 , 11 (SEM)

Eunotia formica var. elongta Hustedt, 1909

Eunotia formica f. elongata (Hustedt) Ant. Mayer, 1918

Eunotia formica sensu Germain, 1981

Holotype.

Lange-Bertalot et al. 2011: pl. 222/fig. 1.

Illustrations.

Bąk et al. 2012: p. 131, pl. 11/7 exemplars; Ector et al. 2012: p. 249-250, 3 exemplars; Costa 2015: p. 50, pl. 100/figs 1-5; Marra et al. 2016: fig. 53.

Diagnosis.

Morphometric data: length 83-125 µm; width m8, cp9 µm; striae density m9-11, p12-15 in 10 µm. Lange-Bertalot et al. 2011: length 20-170 µm; width c7-10, m6-8 µm; striae density 8-12, p15-16 in 10 µm.

Frustule bi-symmetric, bipolar, biraphid with mirror-symmetric, mantle-offset, brevisslit type of raphe. Valves weakly dorsiventral, with gentle gibbosity in central valve part on ventral side and subcapitate broad rounded poles. Valve mantle high, of about 0.5 of valve width, perpendicular to the valve surface; valve/mantle junction narrow hyaline (see Lange-Bertalot et al. 2011: pl. 223/fig. 4). Striae basal, uniserial, distant, irregularly spaced along the valve; on the mantle additional short intercalar striae (see Lange-Bertalot et al. 2011: pl. 223/fig. 4). Areolae small with round outer foramina. Raphe system consists of two short filiform slits on ventral valve mantle; central raphe pores round; tr-fissures long, widely round, follow the pole outline and finish on dorsal valve margin (see Lange-Bertalot et al. 2011: pl. 223/figs 2, 3, 5-7).

Ecology.

Freshwater benthic species, occurs in moderately acidic, dystrophic or oligosaprobic waters ( Lange-Bertalot et al. 2011).

Distribution.

EUROPE: France, Germany, Netherlands, Poland (M. Gury in Guiry and Guiry 2019); Ukraine (present paper). S. AMERICA: Brasil ( Costa 2015, Costa et al. 2017; Marra et al. 2016). In Ukraine. The Cheremsky Nature Reserve, tract Obkopane, ditch, epiphyton on Sphagnum sp.; Lake Redychi, wetland area, epiphyton on Sphagnum sp.

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).