Cyclotella meneghiniana Kuetz ., Kieselschal. Bacill.: 50, pl. 30, fig. 68. 1844.

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 meneghiniana Kuetz., Kieselschal. Bacill.: 50, pl. 30, fig. 68. 1844.

Synonyms.

C. kuetzingiana Thwaites, C. rectangula Bréb. ex Rabenh.

Morphological description.

Frustule cylindrical, valves with a tangentially undulated central part, 10.4-33.3 μm in diameter, striae wedge-shaped 5-8 in 10 μm. Central processes (usually from 1 to 9) and spines are present at the mantle of the valve (Fig. 7E, F ).

Ecology.

Cyclotella meneghiniana was recorded as tychoplanktonic, in coastal and estuarine locations with water of varied chemistry ( Trigueros and Orive 2000). Its optimal development occurred at temperatures in the range of 20.1-20.6 °C ( Stoermer and Ladewski 1976) but it was eurythermal ( Gasse 1986). This is a mesopolysaprobic, and eutraphentic taxon, particularly common for shallow, nutrient rich waters, favoured by moderately alkaline conditions ( Håkansson 1993; Van Dam et al. 1994).

Distribution.

Valves were found at all investigated sites of Southern Bug during this research (Table 1 ). For Ukrainian territory it has been reported for the Dnipro Estuary, the Southern Bug as well, but near Vinnitsya (300 km upriver form Mykolayiv), the rivers Siverskyi Donets, Dnister, Danube, Dnipro, Desna, Prypiat, Teteriv, Oskol, small rivers in Odessa region and other rivers ( Tsarenko et al. 2009).

Concerning global distribution, Cyclotella meneghiniana is considered a widespread taxon ( Houk et al. 2010); it was also recorded for Berlin, Germany ( Geissler and Kies 2003).

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).