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Sellaphora saugerresii has a lower stria density. Sellaphora atomoides is similar to S. nigri with overlapping size range, but valves of S. atomoides are generally more narrow with a higher stria density and have a distinctly rectangular or bow-tie shaped central area. Sellaphora atomoides has been verified from aerial habitats and more 'pristine' conditions, while S. nigri is believed to be far more widespread and tolerant of polluted environments. Sellaphora disjuncta is larger and has subcapitate ends.

LM scalebar = 10 µm
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

Sellaphora nigri

(De Not.) Wetzel and Ector 2015

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 disjuncta

(Hust.) D.G.Mann 1989

Sellaphora disjuncta LM7 Sellaphora disjuncta LM8 Sellaphora disjuncta LM6 Sellaphora disjuncta LM4 Sellaphora disjuncta LM1 Sellaphora disjuncta LM3 Sellaphora disjuncta LM2
Length Range
16-28 µm
Width Range
4-5 µm
Striae in 10 µm
23-28