(Hustedt) Bukhtiyarova 2006 Category: Monoraphid
BASIONYM: Achnanthes amoena Hustedt 1952
Contributor: Marina Potapova - November 2010
Length Range: 6-13 µm
Width Range: 3.2-4.9 µm
Striae in 10 µm: 22-26 on raphevalve, 18-20 on rapheless valve
Valves are linear-elliptical with capitate to rostrate apices. Both raphe and rapheless valves have a lanceolate axial area and no distinct central area. The raphe is straight. Striae on raphe valve are radiate, becoming parallel to slightly convergent toward the apices, interrupted by a thin longitudinal line in the middle of the valve, 22-26 in 10 µm. Each stria in the middle of the raphe valve consists of two transapically elongated areolae. Striae near apices consist of a single areola. The striae on rapheless valve are slightly radiate, becoming parallel to slightly convergent toward the apices, interrupted by a wide longitudinal hyaline area on each side of the valve, 18-20 in 10 µm. Each stria consists of two transapically elongated areolae that also form longitudinal rows.
Basionym: Achnanthes amoena
Author: Hustedt 1952
Length Range: 10 µm
Width Range: 4 µm
Striae in 10 µm: 24 on raphe valve, 20 on rapheless valve
Valvae lineari-ellipticae apicibus late capitatis, circiter 10 µ longae, 4 µ latae. Rhaphovalva rhaphi directa, area axiali angustissima, area centrali nulla, striis ad rhaphin perpendicularibus, circiter 24 in 10 µ. Areovalva area axialis anguste lanceolata, striis transapicalibus validis, circiter 20 in 10 µ, ad rhaphin fere perpendicularibus, utrimque una costa longitudinali decussatis.
Bukhtiyarova, L.N. (2006). Additional data on the diatom genus Karayevia and a proposal to reject the genus Kolbesia. Nova Hedwigia Beiheft 130: 85-96.
Hustedt, F. (1952). Neue und wenig bekannte Diatomeen. IV. Botaniska Notiser 1952:366-410.
NADED ID: 125007
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.