Fragilariforma brasiliensis (Grunow) Almeida, Wetzel, Morales & Bicudo

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 : 3

Fragilariforma brasiliensis (Grunow) Almeida, Wetzel, Morales & Bicudo

in Almeida et al., Fottea, 17: 277-292, figs. 37-50. 2017.

( Figs. 19-23 )

Valves linear to lanceolate, constricted in the middle. Subcapitate to rostrate ends.Axial and central area absent. Striae uniseriate, parallel, composed by circular areolae, extending onto the mantle. Length: 22.1-54.7 μm; width: 4.2-6.3 μm; striae <20 in 10 μm. Species erroneously identified as Fragilariforma javanica Hustedt in taxonomic and ecological Brazilian studies. The morphological differences between these two species are the shape and width of apices and kind of spines ( Almeida et al. 2017).

Material examined: BRAZIL, MATO GROSSO DO SUL: Taquaruçú, Patos Lake , 23.III.2018, sediment, D.T. Ruwer (Nupélia UEM - 18098-104 , 18106-107 , 18109 , 18113-115 ).

Occurrence: first citation for Upper Paraná River floodplain.

Figures

Figure 2-40. Sediment diatoms from subtropical floodplain lakes (LM). 2-3. Discostella stelligera; 4-6. Aulacoseira ambigua; 7-9. Aulacoseira distans; 10-11. Aulacoseira granulata; 12-13. Aulacoseira italica; 14-16. Aulacoseira herzogii; 17-18. Aulacoseira pusilla; 19-23. Fragilariforma brasiliensis; 24-27. Pseudostaurosira cf. brevistriata; 28-31. Staurosira sp.1; 32-37; Staurosirella sp.1; 38-40. Staurosirella crassa. (Scale bar:10 μm).