Spirotaenia closteridia (Ķtzing) Rabenhorst (1868: 146) (Fig. 16)

Basionym: Palmogloea closteridia Ķtzing (1849: 228)

Cells 6–8 times longer than broad, with a slight curvature, narrowed towards the rounded poles, chloroplast ribbon-shaped, parietal, that makes 1.5–3.5 turns. Cell dimensions: length 15–33 μm, breadth 2.5–4 μm.

Distribution: Europe: Austria, France, Germany, Russian Federation, Ukraine (Guiry & Guiry 2023, Kossinskaja 1952); North America: USA (Prescott et al. 1972). South America: Brazil (Ramos et al. 2017).

Ecology: plankton, metaphyton; spring water, bromeliad phytotelm.

Note: The slightly curvature pattern of the cell is the main morphological feature of this species.