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Frustulia crassinervia

(Bréb.) Lange-Bert. and Krammer 1996      Category: Symmetrical biraphid
BASIONYM: Navicula crassinervia Bréb. in W.Sm. 1853
SYNONYM(S): Frustulia rhomboides var. crassinervia (Bréb.) R.Ross | Navicula rhomboides var. crassinervia (Bréb.) Grunow 

Frustulia capitata


Frustulia creuzburgensis

LM scalebar = 10 µm = 80 pixels.


Contributor: Pat Kociolek | Carrie Graeff - January 2011
Length Range: 35-48 µm
Width Range: 9.0-10.5 µm
Striae in 10 µm: 33-35 in the center


Valves are rhomboid with undulate margins. Apices are narrowly rounded and moderately protracted. Both the longitudinal ribs and the raphe are slightly curved. The ribs are slightly constricted at the central nodule. The longitudinal striae are wavy, but not prominent. Striae are fine and mostly parallel; in some valves the striae are wavy along the length of the valve. At the apices, the striae are difficult to discern, but appear to be present in some specimens. The longitudinal ribs and helictoglossae fuse to form a small porte-crayon.

Images of F. crassinervia (Lange-Bertalot 2001, pl. 127, figs 7-15) suggest that the species has striae that circumradiate the apices.

Original Description

Basionym: Navicula crassinervia
Author: Bréb. in W.Sm. 1853
Length Range: µm
Striae in 10 µm:

Original Description

Original Images

Cite This Page:
Kociolek, P., and Graeff, C. (2011). Frustulia crassinervia. In Diatoms of the United States. Retrieved May 24, 2018, from

Species: Frustulia crassinervia

Contributor: Pat Kociolek | Carrie Graeff

Reviewer: Marina Potapova


Lange-Bertalot, H. (2001). Navicula sensu stricto, 10 genera separated from Navicula sensu lato, Frustulia. Diatoms of Europe 2: 1-526.

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.

Smith, W. (1853). Synopsis of British Diatomaceae. John Van Voorst, London 1853. 89 pp., pls 1-31.

Links & ID's

Index Nominum Algarum (INA)

Transfer INA
Original INA

California Academy of Sciences (CAS)

Frustulia crassinervia CAS

NCBI Genbank Taxonomy

Frustulia crassinervia NCBI

North American Diatom Ecological Database (NADED)

NADED ID: 35024

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

Frustulia crassinervia

EMAP Response Plots

Frustulia crassinervia

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.