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Diatoms of the United States is now known as Diatoms of North America.
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Surirella striatula

Turpin 1828      Category: Surirelloid
SYNONYM(S): Navicula striatula (Turpin) Ehrenb. 1832 

Surirella stalagma


Surirella suecica

LM scalebar = 10 µm = 20 pixels.


Contributor: Peter Fedrigon - June 2016
Length Range: 71-127 µm
Width Range: 46.4-80.7 µm
Striae in 10 µm: 16-22


Valves are elliptic to ovate, ranging from isopolar to heteropolar due to torsion along the apical axis. Apices broadly rounded. The axial area is ridge-like and appears to branch out between the valve porcae or ribs, extending to the valve margin. Length to width ratio of approximately 1.5. The valve face has large undulating porcae (ribs) that extend from the valve margin to the hyaline axial area. The ribs are not evenly spaced and are asymmetric in shape and size. Striae are located on the porcae; the area between porcae are covered in unorganized punctae. At the apex, hyaline undulations radiate from the central midline and create a triangular shaped area that is filled with striae. The raphe system is raised on a peripheral alar wing along the entire valve margin.

Original Description

Author: Turpin 1828
Length Range: 100 µm
Striae in 10 µm: N/A

Original Description

Original Images

Cite This Page:
Fedrigon, P. (2016). Surirella striatula. In Diatoms of the United States. Retrieved May 20, 2018, from

Species: Surirella striatula

Contributor: Peter Fedrigon

Reviewer: Mark Edlund


Cumming, B.F., Wilson, S.E., Hall, R.I. and Smol, J.P. (1995). Diatoms from British Columbia (Canada) Lakes and their relationship to salinity, nutrients and other limnological variables. Bibliotheca Diatomologica 31: 1-207.

Edlund, M.B., Soninkhishsig, N., Williams, R.M. and Stoermer, E.F. (2001). Biodiversity of Mongolia: Checklist of diatoms, including new distributional reports of 31 taxa. Nova Hedwigia 72(1-2):59-90.

Hustedt, F. (1930). Bacillariophyta (Diatomeae). In: Die Subwasser Flora Mitteleuropas. (A. Pascher, ed.),10, Gustav Fischer, Jena. 468 pp.

Ruck, E.C. and Kociolek, J.P. (2005). Preliminary phylogeny of the Family Surirellaceae (Bacillariophyta). Bibliotheca Diatomologica 50: 1-236.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Surirella striatula CAS

NCBI Genbank Taxonomy

Surirella striatula NCBI

North American Diatom Ecological Database (NADED)


Autecology Discussion

Surirella striatula is typically a marine species, but was found in the epiphyton and plankton of Salt Lake, Lac qui Parle County, Minnesota, USA.

It has been observed living in river algal mats in Uvs aimag (province), Davst sum (district), Jireg Gol, Mongolia (Edlund et al. 2001). This area is saline due to large salt rock deposits. This taxon has been found in lakes in British Columbia (Cumming et al. 1995), as well as in saline inland waters in Europe (Hustedt 1930).


Salt Lake shoreline, Minnesota, USA

Credit/Source: Mark Edlund

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

Surirella striatula

EMAP Response Plots

Surirella striatula

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.