Contributor: Paula Furey - March 2012
Length Range: 42-180 µm
Width Range: 2.5-3.5 µm
Striae in 10 µm: 14-17 in the center, 16-22 at the ends
Valves moderately arched. The ventral margin is concave, while the dorsal margin is convex. Valves become progressively narrower toward the apices. Helictoglossae are located close to the apices. The apices are slightly inflated and slightly recurved toward the dorsal margin. The distal raphe end curves on to the valve face, then bends 180º and continues a short distance toward the proximal raphe ends. This raphe curvature is visible in the LM. The areolae are unresolved in the LM. Aberrations may occur in the valves, often in the form of a protuberance or bump on the ventral margin.
Basionym: Eunotia naegelii
Author: Migula 1907
Length Range: 40-75 µm
Striae in 10 µm: 17-19
Migula, W. (1907). Kryptogamen-Flora von Deutschland, Deutsch-Osterreich und der Schweiz im Anschluss an Thome’s Flora von Deutschland, Osterreich und der Schweiz. (Band VI, Kryptogamen-Flora), Band II, Algen, Teil 1, Cyanophyceae, Diatomaceae, Chlorophyceae. Friedrich von Zenzschwitz, Gera. pp. 1-918, 43 pls.
NADED ID: 33036
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.
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.