Eunotia sp. 3 (cf. Eunotia paludosa Grunow, 1862: p. 336, pl. 3/fig. 10a-d)

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 : 17

Eunotia sp. 3 (cf. Eunotia paludosa Grunow, 1862: p. 336, pl. 3/fig. 10a-d) Figs 18-20

Morphometric data.

Length 19-24 µm, width 3.5-4 µm; striae density c14-16, p22 in 10 µm.

Distribution in Ukraine.

The Cheremsky Nature Reserve, tract Obkopane, ditch, epiphyton on Sphagnum sp.

Comments.

These specimens correspond to the current literature concept of E. paludosa in valve outline of small specimens (see Furey 2012: figs 4-6 from left; Pavlov and Levkov 2013: pl. 42/figs 23-38; Costa 2015: pl. 17/figs 1-10; Kulikovskiy et al. 2016: pl. 19/figs 8, 9). However, the illustrations by Grunow (1862: p. 336, pl. 3/figs 10a-c) show a much more arcuate valve outline that differs significantly from the literature concept.

The other species whose small specimens have similar valve outline to the discovered specimens was reported as Eunothia fennica (Hustedt) Lange-Bert. in Werum and Lange-Bertalot (2004) by Noga (2019: only figs 2e-g, 3c-e). However, the detail study of E. fennica ( Hamilton and Siver 2010: figs 1-11, 16-29) shows a clear difference from the specimens on Figs 17-19 and the ones, cited from Noga (2019): in valve outline, presence of spines, morphonetric data. Hamilton and Siver (2010) also have underlined that E. fennica can be confused with E. paludosa , more over, the authors found both species in the same sample.

In Topachevsky and Oksiyuk (1960) E. paludosa was considered a synonym of Eunotia exigua ( Bréb. ex Kütz.) Rabenh. but both species are valid taxa at present.

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).