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Navicula capitatoradiata

H.Germ. ex Gasse 1986      Category: Symmetrical biraphid
BASIONYM: Navicula cryptocephala var. intermedia Grunow in Van Heurck 1880

REPORTED AS: Navicula salinarum var. intermedia (Patrick and Reimer 1966) 

Navicula canalis


Navicula cari

LM scalebar = 10 µm = 80 pixels.


Contributor: Sam Rushforth | Sarah Spaulding - November 2010
Length Range: 30-37 µm
Width Range: 7.0-7.7 µm
Striae in 10 µm: 14-15


Valves are lanceolate, with protracted rostrate ends, 7.0-7.7 µm wide and 30-37 µm long. The raphe is filiform. The axial area is narrow and linear. The central area is oval to irregular, often with alternately long and short striae. Striae are radiate and curved, or irregularly curved near the valve center. Striae become convergent at the valve apices. Striae are lineolate, 14-15 in 10 µm.

Original Description

Basionym: Navicula cryptocephala var. intermedia
Author: Grunow in Van Heurck 1880
Length Range: µm
Striae in 10 µm:

Original Description

N. CRYPTOCEPHALA Kg. VAR INTERMEDIA (se rapprochant du N. salinarum).

Original Images

Cite This Page:
Rushforth, S., and Spaulding, S. (2010). Navicula capitatoradiata. In Diatoms of the United States. Retrieved May 22, 2018, from

Species: Navicula capitatoradiata

Contributor: Sam Rushforth | Sarah Spaulding

Reviewer: Pat Kociolek


Cox, E.J. (1995). Taxonomic studies on the diatom genus Navicula Bory VII. The identity and typification of Navicula gregaria Donkin, N. cryptocephala Kutz. and related taxa. Diatom Research 10: 91-111. 10.1080/0269249X.1995.9705330

Gasse, F. (1986). East African diatoms: Taxonomy, ecological distribution . Bibliotheca Diatomologica, Vol: 11, 201 pp.

Germain, H. (1981). Flore des diatomées - Diatomophycées- eaux douces et saumâtres du Massif Armoricain et des contrées voisines d’Europe occidentale. Collection "Faunes et Flores Actuelles". Société Nouvelle des Editions Boubée, Paris. 444 pp.

Lange-Bertalot, H. (2001). Navicula sensu stricto, 10 genera separated from Navicula sensu lato, Frustulia. Diatoms of Europe 2: 1-526.

Links & ID's

Index Nominum Algarum (INA)

Transfer INA

California Academy of Sciences (CAS)

Navicula capitatoradiata CAS

NCBI Genbank Taxonomy

Navicula capitatoradiata NCBI

North American Diatom Ecological Database (NADED)

NADED ID: 46661

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

Navicula capitatoradiata

EMAP Response Plots

Navicula capitatoradiata

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.