Navicula rhynchocephala

Ehrenberg 1844      Category: Symmetrical biraphid
BASIONYM: Navicula rhynchocephala Kützing 1844

Navicula reinhardtii

 

Navicula rhynchotella

LM scalebar = 10 µm = 80 pixels.



Observations

Contributor: Pat Kociolek - March 2011
Length Range: 48-53 µm
Width Range: 9-10 µm
Striae in 10 µm: 8-9 at the center, 11-12 towards the apices

Description

Valves are lanceolate with elongate-protracted, rounded apices. The axial area is narrow, straight, widening to form an irregularly-rounded to elliptical central area. The central area is formed by shortened striae that are also more widely spaced than elsewhere on the valve. The raphe is lateral, slightly arched, with dilated proximal raphe ends. Striae are distinctly lineolate, radiate around the center, becoming parallel, then convergent at the ends.

Taxonomic note: We present N. rhynchocephala following Lange-Bertalot (2001). The specimen illustrated as N. rhynchocephala in Patrick & Reimer (1966) corresponds to our treatment of N. rhynchotella. The type material of N. rhynchocephala, however, has not been investigated and further work may clarify the original type as designated.



Original Description

Basionym: Navicula rhynchocephala
Author: Kützing 1844
Length Range: µm
Striae in 10 µm:

Original Description

Original Images


Cite This Page:
Kociolek, P. (2011). Navicula rhynchocephala. In Diatoms of the United States. Retrieved November 24, 2014, from http://westerndiatoms.colorado.edu/taxa/species/navicula_rhynchocephala

Species: Navicula rhynchocephala

Contributor: Pat Kociolek

Reviewer: Sarah Spaulding

Citations

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 rhynchocephala CAS

NCBI Genbank Taxonomy

Navicula rhynchocephala NCBI

North American Diatom Ecological Database (NADED)

NADED ID: 46154

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 rhynchocephala


EMAP Response Plots

Navicula rhynchocephala


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.