Chamaepinnularia soehrensis

(Krasske) Lange-Bert. and Krammer in Lange-Bert. and Metzeltin 1996      Category: Symmetrical biraphid
BASIONYM: Navicula soehrensis Krasske 1923
SYNONYM(S): Pinnularia soehrensis (Krasske) J.B.Petersen 

Chamaepinnularia mediocris


Cocconeis fluviatilis

LM scalebar = 10 µm = 80 pixels.


Contributor: Megan Otu | Sarah Spaulding - March 2011
Length Range: 10-12 µm
Width Range: 2 µm
Striae in 10 µm: 18-20


Valves are linear, with triundulate margins and capitate apices. The axial area is narrow and linear. The central area is oval to rectangular, depending on the level of focus. The central nodule is distinctly thickened, compared to other parts of the valve. The raphe is filiform and straight. The striae are slightly radiate to parallel and composed of a single, elongate areola on the valve face. Terminal nodules are distinct.

Original Description

Basionym: Navicula soehrensis
Author: Krasske 1923
Length Range: 12 µm
Width Range: 2 µm
Striae in 10 µm: 24

Original Description

Schalen linear, dreiwellig, Enden leicht kopfig, Länge 12µ, Breite 2µ. Streifen deutlich, ca. 24 in 10 µ. - Fundort: Abfluss des Grubenteiches bei Wattenbach (Söhre bi Cassel). - Die Stellung im System ist noch unsicher, vielleicht zu Pinnularia.

Original Images

Cite This Page:
Otu, M., and Spaulding, S. (2011). Chamaepinnularia soehrensis. In Diatoms of the United States. Retrieved April 24, 2018, from

Species: Chamaepinnularia soehrensis

Contributor: Megan Otu | Sarah Spaulding

Reviewer: Sam Rushforth


Krasske, G. (1923). Die Diatomeen des Casseler Beckens und seiner Randgebirge, nebst einigen wichtigen funden aus Niederhessen. Botanisches Archiv. Konigsberg 3(4):185-209.

Lange-Bertalot, H. and Metzeltin, D. (1996). Indicators of oligotrophy - 800 taxa representative of three ecologically distinct lake types, Carbonate buffered - Oligodystrophic - Weakly buffered soft water. Lange-Bertalot, H. (ed.), Iconographia Diatomologica. Annotated Diatom Micrographs. Vol. 2. Ecology, Diversity, Taxonomy. Koeltz Scientific Books. Königstein, Germany, 2:390 pp.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Chamaepinnularia soehrensis CAS

North American Diatom Ecological Database (NADED)

NADED ID: 212006

Autecology Discussion

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

Chamaepinnularia soehrensis

EMAP Response Plots

Chamaepinnularia soehrensis

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.