Platessa lutheri

(Hust.) Potapova 2012      Category: Monoraphid
BASIONYM: Achnanthes lutheri Hust. 1933

Platessa kingstonii


Platessa stewartii

LM scalebar = 10 µm = 80 pixels.


Contributor: Marina Potapova - January 2012
Length Range: 8-17 µm
Width Range: 4.5-6.0 µm
Striae in 10 µm: 25–29 on raphe valve, 12–15 on rapheless valve


Valves are elliptic. The raphe valve has a narrow linear axial area and a wide, bow-tie-shaped central area. The raphe is straight, filiform, without terminal fissures, and with external distal ends slightly expanded into drop-like pores. The external proximal raphe ends are straight, and positioned within a shallow groove. There are helictoglossae at the internal distal raphe ends. The striae on the raphe valve are uniseriate, and strongly radiate. The rapheless valve has a wide lanceolate axial area bordered by short and broad biseriate striae. The internal openings of areolae on both valves are round.

Original Description

Basionym: Achnanthes lutheri
Author: Hust. 1933
Length Range: 9 µm
Width Range: 4.5 µm
Striae in 10 µm: 30 on raphe valve, 15–16 on rapheless valve

Original Description

Original Images

Cite This Page:
Potapova, M. (2012). Platessa lutheri. In Diatoms of the United States. Retrieved April 21, 2018, from

Species: Platessa lutheri

Contributor: Marina Potapova

Reviewer: Loren Bahls


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.

Johansen, J.R., Lowe, R., Gomez, S.R., Kociolek, J.P. and Makosky, S.A. (2004). New algal species records for the Great Smoky Mountains National Park, U.S.A., with an annotated checklist of all reported algal species for the park. Archiv für Hydrobiologie Supplement 150: 17-44.

Krammer, K. and Lange-Bertalot, H. (2004). Bacillariophyceae 4. Teil: Achnanthaceae, Kritische Erganzungen zu Navicula (Lineolatae), Gomphonema Gesamtliteraturverzeichnis Teil 1-4 [second revised edition]. In: H. Ettl et al., Suesswasserflora von Mitteleuropa. Spektrum Akademischer Verlad Heidelberg, 468 pp.

Potapova, M. (2012). New species and combinations in monoraphid diatoms (Family Achnanthidiaceae) from North America. Diatom Research 27(1): 29-42. doi:10.1080/0269249X.2011.644636

Links & ID's

Index Nominum Algarum (INA)

California Academy of Sciences (CAS)

North American Diatom Ecological Database (NADED)


Autecology Discussion

Platessa lutheri has been reported from oligotrophic circumneutral waters and aerial habitats of Europe and North America (Krammer & Lange-Bertalot 2004). This species is rare in the US: it was found by Johasen et al. (2004) in the Great Smoky Mountain National Park and there is one record in the ANSP databases from the Murderkill River, Delaware.

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

Platessa lutheri

EMAP Response Plots

Platessa lutheri

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.