Gomphonema acuminatum

Ehrenberg 1832      Category: Asymmetrical biraphid
BASIONYM: Gomphonema acuminatum Ehrenberg 1832

Gomphoneis trullata

 

Gomphonema acuminatum var. pusillum

LM scalebar = 10 µm = 40 pixels.



Observations

Contributor: Pat Kociolek - March 2011
Length Range: 19-77 µm
Width Range: 7-12 µm
Striae in 10 µm: 9-12 at the center, 12-14 towards the footpole

Description

Valves are clavate, tumid at the center with two constrictions along the margin; near the headpole the valve broadens and then becomes apiculate at the headpole, the footpole is rounded. The axial area is narrow, straight, until broadening to form an irregular central area. The central area bears a single stigma. The raphe is lateral and undulate. The external proximal raphe ends are dilated. The external distal raphe ends are deflected onto the mantle in the direction opposite the stigma. Striae are radiate, strongly so at the footpole. A bilobed apical pore field is present at the footpole. Septa and pseudosepta are present at the poles.



Original Description

Basionym: Gomphonema acuminatum
Author: Ehrenberg 1832
Length Range: µm
Striae in 10 µm:

Original Description

Original Images


Cite This Page:
Kociolek, P. (2011). Gomphonema acuminatum. In Diatoms of the United States. Retrieved October 22, 2014, from http://westerndiatoms.colorado.edu/taxa/species/gomphonema_acuminatum

Species: Gomphonema acuminatum

Contributor: Pat Kociolek

Reviewer: Marina Potapova

Citations

Krammer, K. and Lange-Bertalot, H. (1986). Bacillariophyceae. 1. Teil: Naviculaceae. In: Ettl, H., J. Gerloff, H. Heynig and D. Mollenhauer (eds.) Susswasserflora von Mitteleuropa, Band 2/1. Gustav Fisher Verlag, Jena. 876 pp.

Patrick, R.M. and Reimer, C.W. (1975). The Diatoms of the United States, exclusive of Alaska and Hawaii, V. 2. Monographs of the Academy of Natural Sciences of Philadelphia 13.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Gomphonema acuminatum CAS

NCBI Genbank Taxonomy

Gomphonema acuminatum NCBI

North American Diatom Ecological Database (NADED)

NADED ID: 37001

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

Gomphonema acuminatum


EMAP Response Plots

Gomphonema acuminatum


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.