Compare Fragilariforma constricta
Fragilariforma constrica f. stricta is smaller and lacks undulate margins. Fragilariforma constricta var. trinodis and Fragilariforma polygonata have tri-undulate margins. Fragilariforma hungarica var. tumida has a single, large central undulation.
LM scalebar = 10 µm
Length Range
22-40 µm
22-40 µm
Width Range
3.7-5.9 µm
3.7-5.9 µm
Striae in 10 µm
16-24
16-24
Length Range
22.1-37.5 µm
22.1-37.5 µm
Width Range
9.1-10.5 µm
9.1-10.5 µm
Striae in 10 µm
18-20
18-20
