Compare Fragilariforma polygonata
Compare
Fragilariforma hungarica var. tumida has more narrowly tapered apices and only a single undulation along the valve outline. Fragilariforma constricta var. trinodis has narrow valves and relatively similar sized undulations. Fragilariforma horstii is much smaller, has a higher stria density and more narrow apices.
LM scalebar = 10 µm
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
Fragilariforma horstii
Length Range
6.3-19.9 µm
6.3-19.9 µm
Width Range
6.1-11.7 µm
6.1-11.7 µm
Striae in 10 µm
34 in center to 40 ends
34 in center to 40 ends