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Diatoms of the United States is now known as Diatoms of North America.
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Cymbopleura lata

(Grunow) Krammer 2003      Category: Asymmetrical biraphid
BASIONYM: Cymbella lata Grunow ex Cleve 1894

REPORTED AS: Cymbella lata (Moghadam 1969, p. 183) | Cymbella lata (Patrick & Reimer 1975, p. 37, plate 5, fig. 4) 

Cymbopleura lapponica


Cymbopleura maggieae

LM scalebar = 10 µm = 40 pixels.


Contributor: Loren Bahls - August 2012
Length Range: 46-87 µm
Width Range: 17.0-20.9 µm
Striae in 10 µm: 8-10 at the valve center, 12-14 near the apices


Valves are lanceolate to broadly elliptic-lanceolate and slightly to distinctly dorsiventral with broadly rostrate to apiculate apices. The axial area is uniformly rather narrow and merges with a somewhat wider ovoid central area that is a bit more developed on the dorsal side. The central area is nearly absent in smaller specimens. The raphe is lateral and becomes filiform at the ends. Proximal raphe ends are straight and inflated. Distal raphe ends are comma-shaped and deflected dorsally. Striae are radiate throughout and finely punctate. Areolae number 28-32 in 10 µm.

Original Description

Basionym: Cymbella lata
Author: Grunow ex Cleve 1894
Length Range: µm
Striae in 10 µm:

Original Description

Original Images

Cite This Page:
Bahls, L. (2012). Cymbopleura lata. In Diatoms of the United States. Retrieved May 22, 2018, from

Species: Cymbopleura lata

Contributor: Loren Bahls

Reviewer: Sarah Spaulding


Krammer, K. (2003). Cymbopleura, Delicata, Navicymbula, Gomphocymbellopsis, Afrocymbella. Diatoms of Europe. Diatoms of the European Inland Waters and Comparable Habitats 4: 1-530.

Moghadam, F. (1969). An ecological and systematic study of the planktonic diatom communities in Flathead Lake, Montana. Proceedings of the Academy of Natural Sciences of Philadelphia 121: 153-228.

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)

Cymbopleura lata CAS

NCBI Genbank Taxonomy

Cymbella lata NCBI

North American Diatom Ecological Database (NADED)

NADED ID: 47122

Autecology Discussion

Cymbopleura lata is rare in the United States. It has been confirmed from two lakes and two rivers in northwest Montana and southwest Alberta and from Lake Metigoshe in northcentral North Dakota. The population shown here is from Lake Five in Flathead County, Montana. On the date this sample was collected, pH measured 8.90 and specific conductance measured 256 µS/cm. Moghadam (1969) reported C. lata from Blue Bay on the east side of Flathead Lake, Montana. A drawing of a Flathead Lake specimen is included in Patrick & Reimer (1975). Krammer (2003) reports C. lata var. americana from the Colorado River.


Lake Five, Flathead County, Montana: home of Cymbopleura lata.

Credit/Source: Lake Five Resort

EMAP Assessment

The Environmental Protection Agency (EPA) western Environmental Monitoring and Assessment Program (EMAP) study was completed during the years 2000-2004 (see citations at bottom of this page). Over 1200 streams and rivers in 12 western states (Arizona, California, Colorado, Idaho, Montana, Nevada, North Dakota, Oregon, South Dakota, Utah, Washington and Wyoming) were selected for sampling based on a stratified randomized design. This type of design insures that ecological resources are sampled in proportion to their actual geographical presence. Stratified randomized design also allows for estimates of stream length with a known confidence in several “condition classes” (good or least-disturbed, intermediately-disturbed, and poor or most-disturbed) for biotic condition, chemistry and habitat.

EMAP Distribution

Cymbopleura lata

EMAP Response Plots

Cymbopleura lata

EMAP citations

Results are published in:

Johnson, T., Hermann, K., Spaulding, S., Beyea, B., Theel, C., Sada, R., Bollman, W., Bowman, J., Larsen, A., Vining, K., Ostermiller, J., Petersen, D. Hargett, E. and Zumberge, J. (2009). An ecological assessment of USEPA Region 8 streams and rivers. U.S. Environmental Protection Agency Region 8 Report, 178 p.

Stoddard, J. L., Peck, D. V., Olsen, A. R., Larsen, D. P., Van Sickle, J., Hawkins, C. P., Hughes, R. M., Whittier, T. R., Lomnicky, G. A., Herlihy, A. T., Kaufman, P. R., Peterson, S. A., Ringold, P. L., Paulsen, S. G., and Blair, R. (2005). Environmental Monitoring and Assessment Program (EMAP) western streams and rivers statistical summary. U.S. Environmental Protection Agency Report 620/R-05/006, 1,762 p.

Stoddard, J. L., Peck, D. V., Paulsen, S. G., Van Sickle, J., Hawkins, C. P., Herlihy, A. T., Hughes, R. M., Kaufman, P. R., Larsen, D. P., Lomnicky, G. A., Olsen, A. R., Peterson, S. A., Ringold, P. L., and Whittier, T. R. (2005). An ecological assessment of western streams and rivers. U.S. Environmental Protection Agency Report 620/R-05/005, 49 p.