Tabellaria fenestrata

(Lyngb.) Kütz. 1844      Category: Araphid
BASIONYM: Diatoma fenestratum Lyngb. 1819

Synedra mazamaensis


Tabellaria flocculosa

LM scalebar = 10 µm = 80 pixels.


Contributor: Dawn DeColibus - June 2013
Length Range: 39-83 µm
Width Range: 2.1-6.9 µm
Striae in 10 µm: 14-19


The valves are linear with a medial inflation that is as wide, or slightly wider, than the distinctly capitate apices. The striae are parallel and alternate. The axial area is narrow and linear. Striae reach the central valve. Girdle bands are open, with regular septa. Four girdle bands per frustule. One rimoportula per valve is present, usually located in, or near, the medial inflation. Rudimentary septa are absent and marginal spines are absent. The cells are joined in colonies that form long, straight chains. The frustules are rectangular in girdle view.

According to Koppen (1975), maximum valve length is 103 µm.

Original Description

Basionym: Diatoma fenestratum
Author: Lyngb. 1819
Length Range: µm
Striae in 10 µm:

Original Description

Original Images

Cite This Page:
DeColibus, D. (2013). Tabellaria fenestrata. In Diatoms of the United States. Retrieved April 25, 2018, from

Species: Tabellaria fenestrata

Contributor: Dawn DeColibus

Reviewer: Rex Lowe


Knudson, B.M. (1952). The diatom genus Tabellaria. I. Taxonomy and morphology. Annals of Botany, New Series16 (63): 421-440.

Knudson, B.M. (1953). The diatom genus Tabellaria. II. Taxonomy and morphology of the plankton varieties. Annals of Botany 17 (65): 131-155 .

Koppen, J.D. (1975). A morphological and taxonomic consideration of Tabellaria (Bacillariophyceae) from the northcentral United States. Journal of Phycology 11: 236-244.

Krammer, K. and Lange-Bertalot, H. (1991). Bacillariophyceae. 3. Teil: Centrales, Fragilariaceae, Eunotiaceae. In Ettl, H., Gerloff, J., Heynig, H. & Mollenhauer, D. (Eds.). Süsswasserflora von Mitteleuropa. 2(3): 1-576. Gustav Fisher Verlag, Stuttgart, Germany.

Kützing, F.T. (1844). Die kieselschaligen Bacillarien oder Diatomeen. Nordhausen. 152 pp., 30 pls.

Lyngbye, H.C. (1819). Tentamen Hydrophytologiae Danicae Continens omnia Hydrophyta Cryptogama Daniae, Holsatiae, Faeroae, Islandiae, Groenlandiae hucusque cognita, Systematice Disposita, Descripta et iconibus illustrata, Adjectis Simul Speciebus Norvegicis. Hafniae. 248 pp.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Tabellaria fenestrata CAS

North American Diatom Ecological Database (NADED)

NADED ID: 67002

Autecology Discussion

Tabellaria fenestrata is usually found in circumneutral waters, especially mesotrophic-eutrophic ponds and lakes. This species can be planktonic (Krammer and Lange-Bertalot 1991) or growing attached to vegetation or other hard substrates (Knudson 1952, Koppen 1975). The colonies form long straight chains; they are rarely found in zig-zag or star-like formations (Knudson 1952, Koppen 1975).

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

Tabellaria fenestrata

EMAP Response Plots

Tabellaria fenestrata

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.