Diatoms of North AmericaDiatoms of North America
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Compare Sellaphora stroemii

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

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Sellaphora subbacillum, S. ventraloides and S. aggerica are similar in size, stria density, and the presence of grooves that are visible in LM. Sellaphora ventraloides has a more lanceolate valve outline and bow-tie-shaped central area. The valve ends of S. subbacillum and S. aggerica are broadly rounded - never subcapitate. The stria density is slightly higher in S. subbacillum and S. aggerica.

LM scalebar = 10 µm
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 subbacillum

(Hust.) Falasco and Ector 2009

Sellaphora subbacillum LM2 Sellaphora subbacillum LM1 Sellaphora subbacillum LM3 Sellaphora subbacillum LM7 Sellaphora subbacillum LM4 Sellaphora subbacillum LM6 Sellaphora subbacillum LM5
Length Range
7-21 µm
Width Range
4-5 µm
Striae in 10 µm
26-28

Also compare to

Sellaphora ventraloides

(Hust.) Falasco and Ector

Sellaphora aggerica

(E. Reichardt) Falasco and Ector