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Cymbella parva has smaller valves (maximum length ~50 ┬Ám). Cymbella cymbiformis has much larger valves, a lower density of striae, and one or more isolated stigmata.

LM scalebar = 10 µm
Cymbella Vulgata1 Cymbella Vulgata2 Cymbella Vulgata3 Cymbella Vulgata4 Cymbella Vulgata5 Cymbella Vulgata6 Cymbella Vulgata7
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

Cymbella cymbiformis

Agardh 1830

Cymbella Cymbiformis 439301 1 Cymbella Cymbiformis 439301 2 Cymbella Cymbiformis 439301 3 Cymbella Cymbiformis 439301 4 Cymbella Cymbiformis 439301 5
Length Range
75.9-120.9 µm
Width Range
17.0-20.1 µm
Striae in 10 µm
6-9 at the valve center, up to 15 near the apices

Cymbella parva

(W.Sm.) Kirchn. in Cohn 1878

Cymbella parva LM1 Cymbella parva LM2 Cymbella parva LM3 Cymbella parva LM4 Cymbella parva LM6 Cymbella parva LM7 Cymbella parva LM8
Length Range
24.5-41.2 µm
Width Range
6.9-8.9 µm
Striae in 10 µm
10-12 at the valve center, up to 14 near the apices