Eunotia ruzickae Bily & Marvan, 1962: p. 293, figs 1-5. *^

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 : 14-15

Eunotia ruzickae Bily & Marvan, 1962: p. 293, figs 1-5. *^ Fig. 14

Illustrations.

Pavlov and Levkov 2013: pl. 58/fig. 7.

Diagnosis.

Morphometric data: length 44 µm, width cp6, m7 µm; striae density c16, p22 in 10 µm. Bílý and Marvan 1962: length 40-90 µm, width 4.5-6 µm, striae density 13-14 in 10 µm.

Frustule bi-symmetric, bipolar, biraphid with mirror-symmetric, mantle-offset, brevisslit type of raphe. Valves dorsiventral, uniform in width, with slightly undulate dorsal margin and weak depression in its central part, usually straight ventral side, sometimes with weak central convexity (see Bílý and Marvan 1962: fig. 1), and broad rounded poles deflected to dorsal side. Striae basal, uniserial, distant, denser at the poles, irregularly spaced. Raphe system consists of two short filiform slits on ventral valve mantle, distal ends of the slits terminate at the poles about 0.3 of valve width from ventral margin.

Ecology.

Freshwater epiphytic species.

Distribution.

EUROPE: Type location: Czech Republic ( Bílý and Marvan 1962); North Macedonia, ( Pavlov and Levkov 2013); Germany, Scandinavia (M. Guiry in Guiry and Guiry 2019); Ukraine (present paper). In Ukraine. Zhytomyr region, Chervonoarmeisky district, swamp, dark films among mosses.

Type information.

"In bentho piscinae Řežabinec prope vicum Ražice in Bohemia meridionali atque in nonnullis locis Moraviae merdionalis", (Typus in herbario Inst. bot. Univ. Brunensis, Brno).

Comments.

The found exemplar has denser striae than in type population. This species has typical raphe system without terminal raphe fissures, however SEM illustrations of the raphe to confirm this were not found.

Figures

Figures 13 - 27. New and rare in Ukraine species of Eunotia Ehrenb. from Ukrainian Polissya and the Lectotypes of two Eunotia species. 13, 13 a Eunotia pseudoflexuosa Hust., arrow indicates rimoportula at the middle of pole where raphe slit distal end finishes on the outer valve surface, double arrow - position of terminal fissure distal end on the outer valve surface, between the arrows - hyaline field from inside valve surface where the terminal fissure is located on the outer valve surface 14 Eunotia ruzickae Bily & Marvan 15, 16 Eunotia implicata Noerpel-Schempp et al. Lectotype: 15 = Eunotia impressa var. angusta Grunow in Van Heurck 1881: pl. 33 / fig. 22, designated here 17, 17 a Eunotia sp. 2 (Eunotia cf. mongolica Kulikovskiy et al.) 18 - 20 Eunotia sp. 3 (cf. Eunotia paludosa Grunow) 21 - 23 Eunotia incisa W. Smith ex Gregory. Lectotype: 23 = Eunotia incisa W. Smith ex Gregory 1854: pl. 4 / fig. 4, designated here 24 Eunotia sp. 4 (cf. Eunotia intermedia (Krasske ex Hustedt) Noerpel & Lange-Bert.) 25 - 27 Eunotia sp. 5 (cf. Eunotia meridiana Metzeltin & Lange-Bert.). Figs 13, 17, 18 SEM: 13, 13 a inside valve surface 17, 17 a, 18 outside valve surface; 19 - 28 LM. Scale bars: 10 µm (13 - 17, 19 - 27); 5 µm (18); 1 µm (13 a, 17 a).