Eunotia deficiens Metzeltin, Lange-Bertalot & García-Rodríguez

Ruwer, Daiane Trevisan & Rodrigues, Liliana, 2021, Sediment diatoms from Upper Paraná River floodplAiN lAKeS: New recordS, Iheringia, Série Botânica (e 2021012) 76, pp. 1-16 : 7

Eunotia deficiens Metzeltin, Lange-Bertalot & García-Rodríguez ,

Iconogr. Diatomol, 15: 48, pl. 22, fig. 5. 2005.

( Figs. 47-49 )

Valves with dorsal margin convex, and slightly concave ventral margin. Ends rounded, slightly subcapitate, not detached from the valve body. Striae are parallel to slightly radiate, equidistant, and more concentrated at the ends. Length: 30-63 μm; width: 7.5-9.5 μm; striae 8-11 in 10 μm. The studied population is consistent with the type of material described in Metzeltin et al. (2005). E. deficiens resembles E. luna var. aequalis Hustedt but they differing in valve dimensions and striae density. E. luna var. aequalis present larger width values (12.6-15.3), dorsal margin more convex, and higher striae density (12-14) ( Bicca et al. 2009, Metzeltin et al. 2005, Simonsen 1987).

Material examined: BRAZIL, MATO GROSSO DO SUL: Taquaruçú, Patos Lake , 23.III.2018, sediment, D.T. Ruwer (Nupélia UEM - 18098-99 , 18101-122 ) .

Occurrence: first citation for Upper Paraná River floodplain.

Figures

Figure 41-65. Sediment diatoms from subtropical floodplain lakes (LM).41-46. Staurosirella sp. 2; 47-49. Eunotia deficiens; 50-52. Eunotia formica; 53. Eunotia bilunaris; 54-58. Eunotia deformis; 59-61. Eunotia longicamelus; 62-65. Eunotia monodon. (Scale bar: 10 μm).