Sellaphora paenepupula Metzeltin & Lange-Bertalot,

Iconogr. Diatomol., 11: 66, pl. 31, figs. 9-15. 2003.

(Figs. 156-157)

Valves elliptical lanceolate, tidy. Ends subcapitate. Axial area linear and narrow. Central area laterally expanded, limited by irregular short striae. Raphe filiform. Striae radiate, more widely spaced about the central area. Length: 18.5-22.9 μm; width: 5.9-7.4 μm; striae <20 in 10 μm. The specimens were consistent and identified according to the type of Sellaphora paenepupula from Metzeltin & Lange-Bertalot (2002) and Metzeltin et al. (2005) specimens. Sellaphora pupula (Kützing) Mereschkovsky can be distinguished from Sellaphora paenepupula by the dimensions, ends short-protracted ends, and pseudoblunt shape valves (Mann et al. 2008).

Material examined: BRAZIL, MATO GROSSO DO SUL: Batayporã, Garças Lake, 21.IX.2017, sediment, D.T. Ruwer (Nupélia UEM - 18072-75, 18083) .

Occurrence: first citation for Upper Paraná River floodplain.