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Sellaphora nigri is morphologically very similar to S. atomoides, and many specimens may not be distinguished from one another in LM. In general, S. nigri is wider, more elliptic, with longer central striae resulting in a less distinct 'bow-tie' shaped central area. Additionally, S. nigri is more widely distributed and pollution-tolerant, while S. atomoides is considered indicative of more 'pristine' conditions. Sellaphora saugerresii is biseriate (although this feature is not visible in LM) and has a lower stria density.

LM scalebar = 10 µm
Sellaphora nigri LM7 Sellaphora nigri LM3 Sellaphora nigri LM2 Sellaphora nigri LM6 Sellaphora nigri LM1 Sellaphora nigri LM4 Sellaphora nigri LM5
Length Range
4.2-13 µm
Width Range
2.8-4.2 µm
Striae in 10 µm
26-32

Sellaphora atomoides

(Grunow) Wetzel and Van de Vijver 2015

Sellaphora atomoides LM4 Sellaphora atomoides LM3 Sellaphora atomoides LM6 Sellaphora atomoides LM5 Sellaphora atomoides LM7 Sellaphora atomoides LM1 Sellaphora atomoides LM2
Length Range
4.6-14.5 µm
Width Range
2.6-3.5 µm
Striae in 10 µm
30-36

Sellaphora saugerresii

(Desm.) Wetzel and Mann 2015

Sellaphora saugerresii LM6 Sellaphora saugerresii LM4 Sellaphora saugerresii LM7 Sellaphora saugerresii LM3 Sellaphora saugerresii LM2 Sellaphora saugerresii LM1
Length Range
6.8-12.3 µm
Width Range
3.1-3.5 µm
Striae in 10 µm
20-22