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Nitzschia recta

Hantzsch ex Rabenh. 1862      Category: Nitzschioid
SYNONYM(S): Nitzschia vitrea var. recta (Hantzsch in Rabenh.; Grunow in Cleve and Grunow) Van Heruck 

Nitzschia perminuta


Nitzschia regula var. robusta

LM scalebar = 10 µm = 40 pixels.


Contributor: Kalina Manoylov - June 2010
Length Range: 48-85 µm
Width Range: 4.7-7 µm
Striae in 10 µm: 39-50


Frustules are rectangular in girdle view. Valves are flat, linear to linear-lanceolate, with wedge-shaped ends. Apices are beak-like, rounded, and somewhat rostrate. The raphe is positioned at the valve margin. A conopeum is visible sometimes in LM. Striae are visible in large specimens. Fibulae are long (1-2 µm) and irregularly spaced, 6-8 in 10 µm.

Cite This Page:
Manoylov, K. (2010). Nitzschia recta. In Diatoms of the United States. Retrieved May 23, 2018, from

Species: Nitzschia recta

Contributor: Kalina Manoylov

Reviewer: Marina Potapova


Rabenhorst, L. (1862). Die Algen Europa’s. Decas 129-130.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Nitzschia recta CAS

North American Diatom Ecological Database (NADED)

NADED ID: 48029

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

Nitzschia recta

EMAP Response Plots

Nitzschia recta

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.