Diatoms of North AmericaDiatoms of North America
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Compare Cymbella subturgidula

Krammer 2002

Compare

Cymbella subturgidula possesses two stigmata, while C. tropica has only one. It differs from C. turgidula by the less convex ventral margin and lower areola density.

LM scalebar = 10 µm
Cymbella subturgidula LM7 Cymbella subturgidula LM4 Cymbella subturgidula LM3 Cymbella subturgidula LM6 Cymbella subturgidula LM2 Cymbella subturgidula LM5 Cymbella subturgidula LM1
Length Range
23-57 (inital cells up to 60) µm
Width Range
8-13 µm
Striae in 10 µm
8-11 in the valve center

Cymbella tropica

Krammer 2002

Cymbella tropica LM3 Cymbella tropica LM4 Cymbella tropica LM2 Cymbella tropica LM1 Cymbella tropica LM5 Cymbella tropica LM7 Cymbella tropica LM6
Length Range
26-42 µm
Width Range
8.5-12 µm
Striae in 10 µm
9-10 in center valve, 13-14 at apices

Cymbella turgidula

Grunow in Schmidt et al. 1875

Cymbella turgidula LM5 Cymbella turgidula LM6 Cymbella turgidula LM1 Cymbella turgidula LM4 Cymbella turgidula LM2 Cymbella turgidula LM3 Cymbella turgidula LM4
Length Range
27-46 µm
Width Range
9.5-14 µm
Striae in 10 µm
9-11 dorsal in the center valve, 12-13 at apices