Navicula cryptocephala

Kützing 1844      Category: Symmetrical biraphid
BASIONYM: Navicula cryptocephala Kützing 1844

Navicula cincta

 

Navicula cryptocephaloides

LM scalebar = 10 µm = 80 pixels.



Observations

Contributor: Marina Potapova - February 2011
Length Range: 21-34 µm
Width Range: 5.2-6.5 µm
Striae in 10 µm: 15-17

Description

Valves are lanceolate with protracted apices The axial area is narrow and straight. The central area is large and circular. The raphe is straight, with ‘drop-like’ expanded external proximal ends. Striae are radiate around the center, becoming convergent at the apices. The areolae are sometimes visible under LM, and number approximately 35 in 10 μm.



Original Description

Basionym: Navicula cryptocephala
Author: Kützing 1844
Length Range: 26.5-30 µm
Striae in 10 µm:

Original Description

N. minuta, laevissima, anguste lanceolata acuminate, apicibus globuloso-capitatis. Long. 1/75’’’-1/85’’’.

Original Images


Cite This Page:
Potapova, M. (2011). Navicula cryptocephala. In Diatoms of the United States. Retrieved October 30, 2014, from http://westerndiatoms.colorado.edu/taxa/species/navicula_cryptocephala

Species: Navicula cryptocephala

Contributor: Marina Potapova

Reviewer: Sarah Spaulding

Citations

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.

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

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)

Original INA

California Academy of Sciences (CAS)

Navicula cryptocephala CAS

NCBI Genbank Taxonomy

Navicula cryptocephala NCBI

North American Diatom Ecological Database (NADED)

NADED ID: 46014

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 cryptocephala


EMAP Response Plots

Navicula cryptocephala


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.