Cymbella laevis

Naegeli in Kütz. 1849      Category: Asymmetrical biraphid

Cymbella janischii


Cymbella lanceolata

LM scalebar = 10 µm = 80 pixels.


Contributor: Loren Bahls - June 2016
Length Range: 21-35 µm
Width Range: 4.9-7.7 µm
Striae in 10 µm: 13-17 dorsal and 16-20 ventral at the valve center; 18-22 at the apices


Valves are lanceolate with very narrow, weakly protracted apices. The dorsal margin is moderately arched; the ventral margin is somewhat less arched. The axial area gradually widens to merge with a slightly wider, but poorly defined central area. The raphe is lateral, becoming reverse-lateral at the proximal ends. Proximal raphe ends are deflected ventrally and terminate with very small central pores. Terminal raphe fissures are deflected dorsally. Striae are finely punctate and radiate. Areolae are distinct in LM. Isolated stigmata are absent.

Original Description

Author: Naegeli in Kütz. 1849
Length Range: µm
Striae in 10 µm:

Original Description

Original Images

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

Species: Cymbella laevis

Contributor: Loren Bahls

Reviewer: Marina Potapova


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

Kützing, F.T. (1849). Species Algarum. Lipsiae. F.A. Brockhaus, 922 pp.

Patrick, R.M. and Reimer, C.W. (1975). The Diatoms of the United States, exclusive of Alaska and Hawaii, V. 2. Monographs of the Academy of Natural Sciences of Philadelphia 13.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Cymbella laevis CAS

NCBI Genbank Taxonomy

Cymbella laevis NCBI

North American Diatom Ecological Database (NADED)

NADED ID: 23093

Autecology Discussion

The specimens on this web page were collected from a mossy seep at the base of the Garden Wall along the Going-To-The-Sun Road in Glacier National Park, Montana.


Weeping Wall along the Going-To-The-Sun Road in Glacier National Park, Montana. A similar habitat nearby supported a large population of Cymbella laevis.

Credit/Source: Becca Rapelje