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Staurophora tackei

(Hust.) L.L.Bahls 2012      Category: Symmetrical biraphid
BASIONYM: Navicula tackei Hust. 1942
SYNONYM(S): Stauroneis tackei (Hust.) Krammer and Lange-Bert. 
REPORTED AS: Stauroneis palustris (Hustedt 1945) 

Staurophora soodensis


Staurophora wislouchii

LM scalebar = 10 µm = 80 pixels.


Contributor: Loren Bahls - January 2012
Length Range: 21-30 µm
Width Range: 5.7-7.3 µm
Striae in 10 µm: 20-30


Valves are linear-lanceolate with convex sides and very broad, obtusely rounded apices. The axial area is very narrow and expands somewhat near the central area in deltoid fashion. The central area is a transverse rectangular fascia, somewhat diagonal in some specimens and in others expanding slightly towards the valve margins, often with short striae at the margins. The raphe is filiform. Proximal raphe ends are expanded and nearly straight. Terminal raphe fissures are strongly hooked, with hooks opening towards the secondary side of the valve. Striae are weakly radiate throughout or sometimes parallel near the middle of the valve. The spacing between striae is highly variable, both within and among specimens. Areolae in the striae are very fine and difficult to resolve in LM.

Original Description

Basionym: Navicula tackei
Author: Hust. 1942
Length Range: 16-20 µm
Width Range: 5-7 µm
Striae in 10 µm: 24

Original Description

Original Images

Cite This Page:
Bahls, L. (2012). Staurophora tackei. In Diatoms of the United States. Retrieved May 23, 2018, from

Species: Staurophora tackei

Contributor: Loren Bahls

Reviewer: Marina Potapova


Bahls, L.L. (2012). Staurophora brantii, a new diatom (Bacillariophyta, Anomoeoneidaceae) from the northwestern Great Plains, USA. Phytotaxa 39: 31-37.

Hustedt, F. (1942). Beiträge zur Algenflora von Bremen. V. Die Diatomeenflora einiger Sumpfwiesen bei Bremen. Abhandlungen des Naturwissenschaftlichen Vereins zu Bremen 32: 184–221. .

Hustedt, F. (1945). Diatomeen aus Seen und Quellgebieten der Balkan-Halbinsel. Archiv für Hydrobiologie 40(4):867-973.

Hustedt, F. (1962). Die Kieselalgen Deutschlands, Österreichs und der Schweiz unter Berücksichtigung der übrigen Länder Europas sowie der angrenzenden Meeresgebiete. L. Rabenhorst (ed.), Kryptogamen Flora von Deutschland, Österreich und der Schweiz. Akademische Verlagsgesellschaft m.b.h. Leipzig 7(Teil 3, Lief. 2):161-348.

Krammer, K. and Lange-Bertalot, H. (1985). Naviculaceae Neue und wenig bekannte Taxa, neue Kombinationen und Synonyme sowie Bemerkungen zu einigen Gattungen. Bibliotheca Diatomologica 9:5-230, 43 pls.

Simonsen, R. (1987). Atlas and Catalogue of the Diatom Types of Friedrich Hustedt. J. Cramer, Berlin & Stuttgart 1: 525 pp.

Links & ID's

Index Nominum Algarum (INA)

Transfer INA

California Academy of Sciences (CAS)

Staurophora tackei CAS

North American Diatom Ecological Database (NADED)

NADED ID: 62044

Autecology Discussion

Staurophora tackei is a rare diatom in ponds and low-gradient streams of the Northwestern Great Plains and the Northern Rocky mountains east of the Continental Divide. There are only seven records of this species in the Montana Diatom Collection.


Sofa Mountain Pools, Waterton Lakes National Park, Alberta: home of Staurophora tackei.

Credit/Source: Barb Johnston, Parks Canada

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

Staurophora tackei

EMAP Response Plots

Staurophora tackei

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.