Thalassiosira faurii (Gasse) Hasle in Phycologia 17(3): 282, figs 61-65. 1978.

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

Thalassiosira faurii (Gasse) Hasle in Phycologia 17(3): 282, figs 61-65. 1978.

Basionym.

Coscinodiscus faurii Gasse, 1975. PhD dis. Univ. Paris VI, Vol. II: 24, pl. 32, figs 1, 2. 1975.

Morphological description.

The frustule is low-cylindrical, valves are flat, 21.4-25.5 μm in diameter, central processes located on the valve ingroups, 6 marginal fultoportulae in 10 μm (Fig. 4G ).

Ecology.

Planktonic and benthic in freshwater reservoirs, lakes, rivers, and fossil. Lack of information for this taxon must be noted, but it is known that this species is very sensitive to salinity ( Roubeix et al. 2014).

Distribution.

Thalassiosira faurii (Gasse) Hasle occurred near Mykolaiv city in the Southern Bug River (Table 1 ). This taxon was registered for the Dnipro River and its reservoirs, mouth of the Danube in the Black Sea ( Maystrova et al. 2007; Roubeix et al. 2014).

Worldwide distribution shows this species to occur in some European countries (Hungary, Russia), Asia (Russia), Africa (Ethiopia, Tanzania, Kenia, Kongo) ( Tsarenko et al. 2009; Roubeix et al. 2014; Genkal et al. 2020).

Figures

Figure 4. SEM (A, B and E-H) and LM (C, D) images of species found in the transitional zone at Mykolaiv city: A-D Pleurosira laevis A, C valve views with arrows shown the ocelli B girdle view E Conticribra weissflogii, valve view with arrows shown central and marginal fultoportulae F Thalassiosira incerta, valve view with arrow shown central fultoportulae G Thalassiosira faurii, valve view H Minidiscus proschkinae, valve view with arrow in the centre shown central fultoportula, and closer to the edge - rimoportula. Scale bars: 10 μm (C-G); 30 μm (A); 50 μm (B); 3 μm (H).