Brachysira neoexilis Lange-Bertalot in H. Lange-Bertalot & G. Moser, 1994

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 : 12

Brachysira neoexilis Lange-Bertalot in H. Lange-Bertalot & G. Moser ,

Biblioth. Diatomol., 29: 51, pls. 5-6, 17, 32, 46, figs. 1-6, 7-11, 19-30. 1994.

( Figs. 137-139 )

Valves lanceolate. Ends subcapitate. Axial area linear and narrow. Central area rounded. Raphe filiform. Striae inconspicuous, parallel to radiate, interrupted by longitudinal hyaline line. Areolae elongated, difficult to visualize in LM. Length: 22-25 μm; width: 4.5-5.0 μm. The population observed is consistent with specimens registered from Brazilian studies of Marra et al. (2016).

Material examined: BRAZIL, MATO GROSSO DO SUL: Batayporã, Garças Lake , 21.IX.2017, sediment, D.T. Ruwer (Nupélia UEM - 18066 , 18071 , 18076 , 18083-84 , 18086-87 , 18093 ) .

Occurrence: first citation for Upper Paraná River floodplain.

Figures

Figure 86-152. Sediment diatoms from subtropical floodplain lakes (LM). 86-94. Achnanthidium exiguum; 95-97. Achnanthidium minutissimum; 98-101. Planothidium bagualensis; 102-105. Placoneis ovillus; 106-109. Cocconeis sp. 1; 110-113. Planothidium dubium; 114-116. Encyonema silesiacum; 117-120. Gomphonema angustatum; 121-125. Gomphonema brasiliense; 126-128. Gomphonema brasiliense spp. pacificum; 129-132. Gomphonema lagenula; 133-136. Gomphonema sp. 1; 137-139. Brachysira neoexilis; 140-152. Naviculadicta sp.1. (Scale bar: 10 μm).