Naviculadicta 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 : 12

Naviculadicta sp. 1

( Figs. 140-152 )

Valves elliptical or linear-lanceolate with rounded ends. Axial area narrow and linear. Central area rectangular limited by a shortened striae, asymmetrical, wider in larger individuals. Raphe filiform. Striae parallel to slightly radiate toward the central area. Length: 8-16 μm; width: 4.0-5.5 μm; striae 16-20 in 10 μm. The specimens observed are morphologically similar to Naviculadicta sp. 1 from Metzeltin & Lange-Bertalot (2007). Besides that, Naviculadicta sp. 1 from Metzeltin & Lange-Bertalot (2007) differ by the central area wider and symmetric. The population from this study resemble Sellaphora saugerresii (Desmazières) Wetzel & Mann and Navicula minima Grunow registered by Wetzel et al. (2015), however; Naviculadicta sp. 1 differs concerning central area shape and striae density.

Material examined: BRAZIL, MATO GROSSO DO SUL: Batayporã, Garças Lake , 21.IX.2017, sediment, D.T. Ruwer (Nupélia UEM - 18073 , 18085-97 ) .

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).