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Sellaphora atomoides has a higher stria density, radiate striae at the apices and is smaller in size. Sellaphora ventraloides is also subcapitate, but the apices are less tapered and approximately equal in width to the center valve. Sellaphora ventraloides also has a bowtie-shaped central area, with interrupted striae. Sellaphora stroemii has rounded to barely subcapitate ends that are approximately equal in width to the center valve, as well as a bowtie-shaped central area, with interrupted striae.

LM scalebar = 10 µm
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

Sellaphora stroemii

(Hust.) H.Kobayasi in Mayama et al. 2002

Sellaphora stroemii LM2 Sellaphora stroemii LM5 Sellaphora stroemii LM6 Sellaphora stroemii LM1 Sellaphora stroemii LM7 Sellaphora stroemii LM4 Sellaphora stroemii LM3
Length Range
6-21 µm
Width Range
3.5-5.0 µm
Striae in 10 µm
23-25

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

Also compare to

Sellaphora ventraloides

Hustedt