Cocconeis sp. 1

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 : 10

Cocconeis sp. 1

( Figs. 106-109 )

Valves elliptic, ends rounded. Valve with raphe: axial area linear and narrow, central area narrow, raphe filiform. Striae delicate interrupted by submarginal hyaline line. Valve without raphe: axial area linear and narrow. Striae slightly radiate. Areolae inconspicuous. Length: 9-11 μm; width: 5.5-6.0 μm; striae 24-26 in 10 μm in both valves. This taxon differs from other Cocconeis Ehrenberg species by the very small dimensions and the presence of delicate striae, hardly visible in LM.

Material examined: BRAZIL, MATO GROSSO DO SUL: Batayporã, Garças Lake , 21.IX.2017, sediment, D.T. Ruwer (Nupélia UEM - 18085-18097 ) .

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).