Navicula longicephala

Hustedt 1944      Category: Symmetrical biraphid
BASIONYM: Navicula longicephala Hustedt 1944

REPORTED AS: Navicula bicephala (Patrick & Reimer 1966) 

Navicula libonensis


Navicula ludloviana

LM scalebar = 10 µm = 80 pixels.


Contributor: Marina Potapova - March 2011
Length Range: 17-22 µm
Width Range: 3.1-4.0 µm
Striae in 10 µm: 18-21


Valves are linear with rostrate to capitate apices. The axial area is narrow and straight. The central area is small. The raphe is straight, with close proximal ends. Striae are strongly radiate around the center, becoming convergent at the apices. The areolae are indistinguishable under LM, approximately 50 in 10 μm.

Original Description

Basionym: Navicula longicephala
Author: Hustedt 1944
Length Range: 19-22 µm
Width Range: 3-4 µm
Striae in 10 µm: 18-20

Original Description

Navicula longicephala nov. spec. Schalen schmal linear mit parallelen Seiten und schmalen, kopfig abgeschnürten und ziemlich lang geschnäbelten Enden, 19-22 µ lang, 3-4 µ breit. Raphe gerade, fadenförmig, Polspalten undeutlich, sehr klein. Axialarea sehr schmal linear, um den Zentralknoten etwas quer erweitert und eine kleine Zentralarea bildend. Transapikalrippen 18-20 in 10 µ, im mittleren Teil radial, an den Enden senkrecht zur Mittellinie, Längslinien sehr zart und kaum erkennbar. Fig. 17.

Original Images

Cite This Page:
Potapova, M. (2011). Navicula longicephala . In Diatoms of the United States. Retrieved October 22, 2016, from

Species: Navicula longicephala

Contributor: Marina Potapova

Reviewer: Sarah Spaulding


Hustedt, F. (1944). Neue und wenig bekannte Diatomeen. Bericht der Deutschen Botanischen Gessellschaft 61:271-290.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Navicula longicephala CAS

North American Diatom Ecological Database (NADED)

NADED ID: 46507

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 longicephala

EMAP Response Plots

Navicula longicephala

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.