Cymbella subleptoceros

Krammer 2002      Category: Asymmetrical biraphid

Cymbella stigmaphora


Cymbella subturgidula

LM scalebar = 10 µm = 80 pixels.


Contributor: Loren Bahls - May 2016
Length Range: 15-38 µm
Width Range: 6.2-9.6 (initial valve) µm
Striae in 10 µm: 9-11 at the valve center, up to 13 near the apices


Valves are dorsiventral and lanceolate with rounded apices. The dorsal margin is moderately arched; the ventral margin is weakly convex to nearly flat in the largest specimens. The central area is a somewhat wider continuation of the axial area, otherwise not distinguished. The raphe is distinctly lateral and bowed, narrowing toward the proximal and terminal ends. Proximal raphe ends are deflected ventrally. Distal raphe fissures are deflected dorsally at about a 45 degree angle. Striae are nearly parallel at the valve center, becoming radiate near the apices. The areolae are distinct in LM and number 20-24 in 10 µm. Stigmata are lacking.

Original Description

Author: Krammer 2002
Length Range: 17-45 µm
Width Range: 7.5-10 µm
Striae in 10 µm: 9-11 at the valve center, up to 13 near the apices

Original Description

Original Images

Cite This Page:
Bahls, L. (2016). Cymbella subleptoceros. In Diatoms of the United States. Retrieved April 22, 2018, from

Species: Cymbella subleptoceros

Contributor: Loren Bahls

Reviewer: Evan Thomas


Krammer, K. (2002). The genus Cymbella. Diatoms of Europe. Diatoms of the European Inland Waters and Comparable Habitats 3: 1-584.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Cymbella subleptoceros CAS

North American Diatom Ecological Database (NADED)


Autecology Discussion

The specimens of Cymbella subleptoceros shown on this web page are from a riparian wetland in northwestern Montana. At the time of collection, pH measured 7.40 and specific conductance measured 460 µS/cm. Krammer (2002) reports this taxon in Europe from mesotrophic waters with average electrolyte content.