Psammothidium levanderi

(Hustedt) Bukhtiyarova and Round 1996      Category: Monoraphid
BASIONYM: Achnanthes levanderi Hustedt 1933

Psammothidium lauenburgianum


Psammothidium marginulatum

LM scalebar = 10 µm = 80 pixels.


Contributor: Marina Potapova - August 2010
Length Range: 7-11 µm
Width Range: 4.5-5.2 µm
Striae in 10 µm: 24-30


Valves are elliptical to linear-elliptical. The raphe valve has a linear axial area and a small asymmetric central area. The raphe is straight, without terminal fissures. The central raphe ends curve toward opposite sides internally. The rapheless valve has a rhomboid axial area, which often has an irregular border. The central area on rapheless valve is usually not differentiated from the axial area. Striae are slightly radiate in the center and strongly radiate at the apices of both valves, 24-30 in 10 µm. One row of areolae is present on the mantle of both valves. Areolae are often visible in LM.

Original Description

Basionym: Achnanthes levanderi
Author: Hustedt 1933
Length Range: 6-9 µm
Width Range: 4-5 µm
Striae in 10 µm: 21-23

Original Description

Schalen elliptisch mit breit gerundeten Enden, 6-9 μ lang, 4-5 μ breit. Raphenlose Schalen mit breit lanzettlicher bis elliptischer Axialarea, Transapicalstreifen kurz, radial, 21-23 in 10 μ. Raphenschale mit feiner, fadenförmiger Raphe, Axialarea sehr eng, Zentralarea klein, rundlich bos etwas quer verbreiert, Transapikalstreifen 22-28 in 10 μ, von der Mitte gegen die Enden allmählich enger werdend, leicht radial, sehr zart punktiert.

Original Images

Cite This Page:
Potapova, M. (2010). Psammothidium levanderi. In Diatoms of the United States. Retrieved October 24, 2016, from

Species: Psammothidium levanderi

Contributor: Marina Potapova

Reviewer: Sarah Spaulding


Bukhtiyarova, L. and Round, F. E. (1996). Revision of the genus Achnanthes sensu lato. Psammothidium, a new genus based on Achnanthidium marginulatum. Diatom Research 11: 1-30.

Hustedt, F. (1933). Die Kieselalgen Deutschlands, Österreichs und der Schweiz unter Berücksichtigung der übrigen Länder Europas sowie der angrenzenden Meeresgebiete. In: L. Rabenhorst (ed.), Kryptogamen Flora von Deutschland, Österreich und der Schweiz. Akademische Verlagsgesellschaft m.b.h. Leipzig, Vol. 7, Part 2, pp. 321-432.

Links & ID's

Index Nominum Algarum (INA)

Transfer INA

California Academy of Sciences (CAS)

Psammothidium levanderi CAS

North American Diatom Ecological Database (NADED)

NADED ID: 186015

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

Psammothidium levanderi

EMAP Response Plots

Psammothidium levanderi

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.