Prestauroneis integra

(W.Sm.) Bruder 2008      Category: Symmetrical biraphid
BASIONYM: Pinnularia integra W.Sm. 1856
SYNONYM(S): Navicula integra (W.Sm.) Ralfs in A.Pritch. 1861 

Pleurosira laevis


Prestauroneis protracta

LM scalebar = 10 µm = 80 pixels.


Contributor: Karen Neil - June 2014
Length Range: 27-43 µm
Width Range: 9.3-12.6 µm
Striae in 10 µm: 9.9-15 at center of the valve, 15.7-20.8 near the apices


Valves are lanceolate to lanceolate-elliptical, with subrostrate apices. Near the apices, the valve margin undulates slightly to form a smooth hump, the width of which does not exceed the mid-breath of the valve. This smooth hump is present across the size range. Pseudosepta are present at the apices. The central area is small and elliptical. The axial area is linear. Striae are radial at the center of the valve, becoming nearly parallel at the apices. Striae are more widely spaced at the center of the valve and more dense near the apices. Striae may be offset, or they may be symmetric on either side of the axial area. Areolae are uniseriate and round to elliptical. Areolae can be resolved near the center of the valve, but less so near the apices. The internal proximal raphe ends are small and curved slightly in the same direction. The external proximal raphe ends are straight and expanded. The distal raphe ends are deflected unilaterally.

The species Prestauroneis tumida was described in Levkov and Williams (2011). However, the valve margin of P. integra is unique, and not likely to be confused with P. tumida.

Original Description

Basionym: Pinnularia integra
Author: W.Sm. 1856
Length Range: µm
Striae in 10 µm:

Original Description

Valve elliptical-lanceolate, with a slight subterminal constriction and linear produced apices; striae indistinct, 36 in .001”. Length of valve .0008”. Greatest breadths of valve .0004”.

Original Images

Cite This Page:
Neil, K. (2014). Prestauroneis integra. In Diatoms of the United States. Retrieved April 25, 2018, from

Species: Prestauroneis integra

Contributor: Karen Neil

Reviewer: Rex Lowe


Levkov, Z. and Williams, D.M. (2011). Fifteen new diatom (Bacillariophyta) species from Lake Ohrid, Macedonia. Phytotaxa 30: 1-41.

Smith, W. (1856). Synopsis of British Diatomaceae. John Van Voorst, London 1856. 2: 107pp., pls. 32-60, 61-62, A-E.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Prestauroneis integra CAS

NCBI Genbank Taxonomy

Prestauroneis integra NCBI

North American Diatom Ecological Database (NADED)

NADED ID: 9105001

Autecology Discussion

Prestauroneis integra was found in plankton collected from a wave zone approximately 1 m offshore in Silver Lake, Dickinson County, Iowa. In this population, the length of P. integra clustered around the lower limit of the observed size range (26-35 µm). Specimens of P. integra from the Iowa Lakeside Lab Herbarium were found in a collection from Bessy Creek, Cheboygan County, Michigan. This population was closer to the maximum observed size range (37-43 µm). These observations demonstrate that a population within a single collection may not span the entire size range for the species. Distribution data from USGS BioData indicate that this taxon occurs near the Great Lakes and the northeastern coast (from Massachusetts to North Carolina). Prestauroneis integra “prefers waters with high mineral content, [and is] often found in polluted waters” (Patrick and Reimer, 1966, p. 474).


Image of Silver Lake, Dickinson County, Iowa, where P. integra was collected using a plankton net in the wave zone.

Credit/Source: Mark Edlund

Graph of the length and width measured in specimens of Prestauroneis integra from Silver Lake, Dickinson County, IA (smaller valves) and Bessy Creek, Cheboygan County, MI (larger valves).

Credit/Source: Michigan specimens collected by Rex L. Lowe, ILL Collection L-3-14

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

Prestauroneis integra

EMAP Response Plots

Prestauroneis integra

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.