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Sellaphora bacillum has linear-elongate valves without protracted apices.

LM scalebar = 10 µm
Sellaphora bacilloides LM5 Sellaphora bacilloides LM4 Sellaphora bacilloides LM3 Sellaphora bacilloides LM2 Sellaphora bacilloides LM1
Length Range
30-35 µm
Width Range
10.0-12.6 µm
Striae in 10 µm
18 (center) -26 (ends)

Sellaphora bacillum

(Ehrenb.) D.G.Mann 1989

Sellaphora bacillum LM4 Sellaphora bacillum LM6 Sellaphora bacillum LM3 Sellaphora bacillum LM5 Sellaphora bacillum LM2 Sellaphora bacillum LM1
Length Range
30-45 µm
Width Range
9-10 µm
Striae in 10 µm
12-14