Cyclotella meduanae H. Germ., Fl. Diat. Mass. Armor. 36, pl. 8, fig. 28, pl. 154, figs 4, 4 a. 1981.

Bilous, Olena P., Genkal, Sergey I., Zimmermann, Jonas, Kusber, Wolf-Henning & Jahn, Regine, 2021, Centric diatom diversity in the lower part of the Southern Bug river (Ukraine): the transitional zone at Mykolaiv city, PhytoKeys 178, pp. 31-69 : 31

Cyclotella meduanae H. Germ., Fl. Diat. Mass. Armor. 36, pl. 8, fig. 28, pl. 154, figs 4, 4 a. 1981.

Morphological description.

Frustule low-cylindrical, central part of valve is slightly tangentially undulated or flat, valves 5.8-9.4 μm in diameter, striae wedge-shaped, 6-9 in 10 μm, central process is absent (Fig. 7C, D ).

Ecology.

Cyclotella meduanae was recorded ecologically as a planktonic taxon from different types of water bodies (lakes, reservoirs, rivers), freshwater and brackish, of different halobity, eutraphentic ( Kiss et al. 2012; Genkal 2014; Hofmann et al. 2018).

Distribution.

This taxon is sporadically found in epilithic benthic samples from the Southern Bug River at two investigated stations (in Mykolaiv City and downstream Mykolaiv) (Table 1 ). For other Ukrainian waters it has been reported for the Dnipro River ( Maystrova et al. 2007), the Danube River ( Genkal and Ivanov 1990).

Globally, this taxon is distributed in the Boreal zone, Europe, Asia and North America ( Genkal 2014; Genkal et al. 2020).

Figures

Figure 7. SEM (A-E, G, H) and LM images (F) of species found in the transitional zone at Mykolaiv city, valve views: A Cyclotella cryptica B Cyclotella marina C, D Cyclotella meduanae E, F Cyclotella meneghiniana G Cyclostephanos dubius H Cyclostephanos invisitatus, with arrows shown on A, D, H marginal and central fultoportulae, B marginal fultoportulae, F central fultoportulae. Scale bars: 2 μm (B, D); 4 μm (A); 5 μm (C, E); 10 μm (F-H).