Psammothidium helveticum

(Hustedt) Bukhtiyarova and Round 2007      Category: Monoraphid
BASIONYM: Achnanthes austriaca var. helvetica Hustedt 1933

Psammothidium harveyi

 

Psammothidium lauenburgianum

LM scalebar = 10 µm = 40 pixels.



Observations

Contributor: Marina Potapova - May 2010
Length Range: 12-26 µm
Width Range: 5.1-7.8 µm
Striae in 10 µm: 24-30

Description

Valves are linear-elliptical. The raphe valve has a linear axial area and a bow tie-shaped central area. The raphe has long terminal fissures curved to opposite sides. The central raphe ends are slightly expanded externally. The central raphe ends curve toward opposite sides internally. The rapheless valve has a narrow linear axial area and a large rounded, hexagonal or diamond-shaped central area. Striae are radiate on both valves, 24-30 in 10 µm, interrupted at the valve margin. The external openings of the areolae on the valve face are circular to slightly elongated. The areolae are often visible in LM near the central area of the rapheless valve. One row of elongated areolae is present on the mantle of both the rapheless and raphe valves; a second row is present on the valve margin at the valve apices.



Original Description

Basionym: Achnanthes austriaca var. helvetica
Author: Hustedt 1933
Length Range: µm
Striae in 10 µm:

Original Description

Schalen typisch elliptisch, die Raphenschalen mit deutlich punktierten Transapikalstreifen (Fig. 831 g-k).

Original Images


Cite This Page:
Potapova, M. (2010). Psammothidium helveticum. In Diatoms of the United States. Retrieved November 24, 2014, from http://westerndiatoms.colorado.edu/taxa/species/psammothidium_helveticum

Species: Psammothidium helveticum

Contributor: Marina Potapova

Reviewer: Sarah Spaulding

Citations

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.

Manoylov, K.M. (2007). On some Psammothidium species from rivers in the United States. Diatom Research 22(2): 317–327.

Monnier, O., Lange-Bertalot, H., Hoffmann, L. and Ector, L. (2007). The genera Achnanthidium Kützing and Psammothidium Bukhtiyarova et Round in the family Achnanthidiaceae (Bacillariophyceae): a reappraisal of the differential criteria. Cryptogamie, Algologie 28:1 41-158.

Links & ID's

Index Nominum Algarum (INA)

Transfer INA
Original INA

California Academy of Sciences (CAS)

Psammothidium helveticum CAS

North American Diatom Ecological Database (NADED)

NADED ID: 186003

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 helveticum


EMAP Response Plots

Psammothidium helveticum


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.