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Fragilaria recapitellata

Lange-Bert. and Metzeltin 2009      Category: Araphid
BASIONYM: Synedra capitellata Grunow in Van Heurck 1881
SYNONYM(S): Fragilaria capucina var. capitellata Krammer and Lange-Bert. 1991 | Fragilaria capitellata (Grunow in Van Heurck) Peterson | non Fragilaria capitellata Laudy 1910 

Fragilaria pennsylvanica


Fragilaria socia

LM scalebar = 10 µm = 80 pixels.


Contributor: Ian Bishop | Sarah Spaulding - August 2014
Length Range: 15-27 µm
Width Range: 4.1-5.6 µm
Striae in 10 µm: 16-20


Valves are wide and linear, with highly constricted, capitate ends. The axial area is narrow and widens slightly near the central area. The central area is unilaterally expanded to the valve margin. Stria density is uniform across the valve. A single rimoportula is present at one end of the valve. A porefield is present at each apex, positioned on the valve mantle and composed of several transapically aligned rows of pores extending slightly onto the valve face. In valve view, frustules are rectangular.

Spines were not observed in SEM, nor were long, band shaped colonies.

The name, F. recapitellata is a new name for Fragilaria capitellata (Grunow in Van Heurck) Petersen 1946 (non Lauby 1910). Note that the taxon illustrated here conforms more to the taxon illustrated in Metzeltin et al. (2009) than in the original description of Synedra capitellata Grunow in Van Heurck 1881.

Original Description

Basionym: Synedra capitellata
Author: Grunow in Van Heurck 1881
Length Range: µm
Striae in 10 µm: 15-18

Original Description

Original Images

Cite This Page:
Bishop, I., and Spaulding, S. (2014). Fragilaria recapitellata. In Diatoms of the United States. Retrieved May 20, 2018, from

Species: Fragilaria recapitellata

Contributor: Ian Bishop | Sarah Spaulding

Reviewer: Mark Edlund


Delgado, C., Novais, M.H., Blanco, S. and Almeida, S.F.P. (2015). Examination and comparison of Fragilaria candidagilae sp. nov. with type material of Fragilaria recapitellata, F. capucina, F. perminuta, F. intermedia and F. neointermedia (Fragilariales, Bacillariophyceae). Phytotaxa 231(1): 001–018. 10.11646/phytotaxa.231.1.1

Lauby, A. (1910). Recherches paléophytologiques dans le Massif Central. Bull. Serv. Darte Geologique France, Mém. 125, tome 20:1-398, Paris.

Metzeltin, D., Lange-Bertalot, H. and Soninkhishig, N. (2009). Diatoms in Mongolia. Iconographia Diatomologica (H. Lange-Bertalot, ed.), Vol. 20, A. R. G. Gantner Verlag K. G., Ruggell, 691 pp.

Petersen, J.B. (1946). Algae collected by Eric Hulten on the Swedish Kamtchatka Expedition 1920-1922, especially from Hot Springs. Det Kongelige Danske Videnskabernes Selskab, Biologiske Meddelelser 20 (1): 1-122.

Stoermer, E. F., Kreis Jr, R. G., and Andresen, N. A. (1999). Checklist of diatoms from the Laurentian Great Lakes. II. Journal of Great Lakes Research 25 (3), 515-566.

Van Heurck, H. (1881). Synopsis des Diatomées de Belgique. Atlas. Ducaju & Cie., Anvers. pls 31-77.

Links & ID's

Index Nominum Algarum (INA)

California Academy of Sciences (CAS)

Fragilaria recapitellata CAS

North American Diatom Ecological Database (NADED)


Autecology Discussion

In North America, Fragilaria recapitellata has been documented in the Great Lakes (Stoermer et al, 1999) and in rivers in the Central Sierra Nevada (USGS NAQWA Survey).

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

Fragilaria recapitellata

EMAP Response Plots

Fragilaria recapitellata

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.


- Extension of Size Range

Prior to this date, length for this taxon was documented as 19.1-29.1 µm. This range was expanded to include smaller specimens found in a separate population by the contributor. The smallest image was taken from this latter population. - I. Bishop