Eunotia implicata Noerpel-Schempp et al. in Alles et al. 1991: p. 206, pl. 7/figs 19-32. *

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 : 9-11

Eunotia implicata Noerpel-Schempp et al. in Alles et al. 1991: p. 206, pl. 7/figs 19-32. * Figs 15 , 16

Eunotia impressa var. angusta Grunow in Van Heurck, 1881: pl. 33/fig. 22 [Basionym]

Lectotype.

Eunotia impressa var. angusta Grunow in Van Heurck 1881: pl. 33/fig. 22 (= Fig. 14 here), designated here.

Illustrations.

Krammer and Lange-Bertalot 1991: p. 197, pl. 143/figs 1-7; Ortiz-Lerín and Cambra 2007: p. 424, pl. 3/fig. C, pl. 4/figs B, I (SEM); Furey et al. 2011: p. 50, pl. 28/figs 1-8; Lange-Bertalot et al. 2011: p. 119, pl. 97/figs 1-39, pl. 225/figs 16-19; Bąk et al. 2012: p. 133, pl. 16/1, 5 exemplars from left to right; Levkov and Pavlov 2013: p. 25, pl. 56/figs 1-26, pl. 57/figs 4-7 (SEM), pl. 65/figs 1-4 (SEM); Costa 2015: p. 54, pl. 27/figs 1-7, pl. 28/figs 1-5 (SEM); Ector et al. 2015: p. 251, 30 exemplars; Bahls et al. 2018: pl. 111/fig. 15.

Diagnosis.

Morphometric data: length 26 µm, width 3.5 µm, striae density c18, p20 in 10 µm. Alles et al. 1991: length 18-30 µm, width 3-5 µm, striae density 14-20 in 10 µm.

Frustule bi-symmetric, bipolar, biraphid with mirror-symmetric, mantle-offset, brevisslit type of raphe. Valves slightly dorsiventral, linear with weakly convex dorsal margin, concave ventral margin and protracted rounded poles. The mantle’s height is equal to about 0.5 of valve width, abruptly perpendicular to the valve surface (see Costa 2015: pl. 28/figs 2, 4). Striae basal, uniserial, distant, uniformly spaced along the valve and compacted at the poles, uninterrupted on dorsal mantle/valve junction and interrupted by sternum on ventral mantle; on dorsal mantle short intercalar striae present (see Costa 2015: pl. 28/figs 2, 4). Areolae small with round outer foramina. Raphe system consists of two short filiform slits on ventral hyaline part of mantle, distal ends of the slits turned to the valve centre under right angle and finish on external valve surface in ventral corner of the poles by small round pores (see Costa 2015: pl. 28/figs 1, 2) connected with helictoglossae; tr-fissures absent.

Ecology.

Freshwater, acidophilus, epiphytic species, inhabits moss vegetation, green filamentous algae. In Spain the species was collected in habitats with pH 4.3-7.9, conductivity 4.17-720 μS /cm, the altitude 76-1356 m asl, SPI 12.3-20. Optimum conditions with pH 5.3-6.8, conductivity 28.7-51 μS /cm, the altitude 472-624 m asl, SPI 19.3-19.7 ( Ortiz-Lerín and Cambra 2007).

Distribution.

EUROPE: Britain, France, Germany, Netherlands (M. Gury in Guiry and Guiry 2019); Macedonia ( Pavlov and Levkov 2013), Poland, Romania, Slovakia, Spain (M. Gury in Guiry and Guiry 2019); Ukraine (present paper). AFRICA: Ghana. ASIA: Russia. AUSTRALIA: Australia, New Zealand. N. AMERICA: Canada, USA. S. AMERICA: Argentina, Brazil, Colombia (M. Gury in Guiry and Guiry 2019). In Ukraine. The Cheremsky Nature Reserve, tract Obkopane, Lake Redychi, epiphyton on Fontinalis sp.

Comments.

Illustration of E. impressa var. angusta in Van Heurck (1881: pl. 35/fig. 1) is not conspecific to E. implicata sensu Nörpel-Schempp et al. (in Alles et al. 1991) as it has depression on dorsal margin and the poles turned to dorsal valve side. In many literature sources the illustrations of this species are not uniform in valve outline and often do not correspond to the species lectotype.

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).