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Navicula canalis

R.M.Patrick 1944      Category: Symmetrical biraphid
BASIONYM: Navicula canalis R.M.Patrick 1944

REPORTED AS: Navicula vandamii (Krammer and Lange-Bertalot 1991) 

Navicula aurora


Navicula capitatoradiata

LM scalebar = 10 µm = 80 pixels.


Contributor: Kalina Manoylov | Paul Hamilton - July 2010
Length Range: 20-25 µm
Width Range: 4.1-5.5 µm
Striae in 10 µm: 16-19


Valves are elliptical-lanceolate to linear-lanceolate with protracted rostrate apices. Valve measurements: length 19.6-25 µm, width 4.1-5.5 µm with 16-19 striae in 10 µm and ca. 20-25 lineolae in 10 µm. Axial area is narrow, and linear. Central area is barely differentiated from the axial area. The raphe is filiform with enlarged proximal raphe ends that deflect towards one side of the valve and distal fissures form a distinct hook down onto the mantle on the opposite side. Striae are lineolate. The striae are radiate at the center to parallel or convergent at the apices. The space between the striae is wider or at least equal to the width of the striae. The central nodule is present on the same side as the deflected proximal fissures.

Original Description

Basionym: Navicula canalis
Author: R.M.Patrick 1944
Length Range: 22 µm
Width Range: 5 µm
Striae in 10 µm: 15-17

Original Description

Valva linearis paulo lanceolata, ad apices attenuatae rostratae, 22 µ longa, 5µ lata, striis lineatis 15-17 per 10 µ, ad centrum valvae paulo radiatis, ad apices valvae parallelis vel plus minusve convergentibus; area axiali angusta; ad nodulum centralem paulo latiori. Pl.1, fig. 7. Distribution-Brazil: Rio Grande do Sul, current water at roadside, near the Lagua dos Quadros, 385 H. Kleerekoper July: 1941 (A-25741). Type (A-25741), scrapings from a stone only wetted at time of collecting, in a rapid near Lagua dos Quadros 367 H. Kleerekoper June 1941 (A-25734).

Original Images

Cite This Page:
Manoylov, K., and Hamilton, P. (2010). Navicula canalis. In Diatoms of the United States. Retrieved May 23, 2018, from

Species: Navicula canalis

Contributor: Kalina Manoylov | Paul Hamilton

Reviewer: Sarah Spaulding


Patrick, R.M. (1944). Estudo Limnologico e Biologico das Lagoas da regiao Litoranea Sul- Riograndense II. Some New Diatoms from the Lagoa dos Quadros. Boletin de Museo Naciona, Nova serie, Botanica. 2:6 pp., 9 fig.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Navicula canalis CAS

North American Diatom Ecological Database (NADED)

NADED ID: 46317

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 canalis

EMAP Response Plots

Navicula canalis

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.