Cymbella parva has smaller valves (maximum length ~50 µm). Cymbella cymbiformis has much larger valves, a lower density of striae, and one or more isolated stigmata.
LM scalebar = 10 µm
Length Range
30.4-59.5 µm
Width Range
7.8-11.7 µm
Striae in 10 µm
9-11 at the valve center, up to 14 near the apices