(Meister ex Hustedt) Lange-Bertalot & Witkowski in Witkowski, Lange-Bertalot & Metzeltin 2000 Category: Symmetrical biraphid
BASIONYM: Navicula circumtexta Meister ex Hustedt in A. Schmidt et al. 1934
Contributor: Marina Potapova - October 2011
Length Range: 26-36 µm
Width Range: 6.0-7.1 µm
Striae in 10 µm: 16-18
Valves are lanceolate with slightly protracted apices. Raphe is straight with proximal ends slightly expanded and deflected to the primary side. Striae are marginal, forming a wide, lanceolate axial area. Each marginal stria consists of four areolae, which are easily observed under LM. There is also a longitudinal row of areolae adjacent to the raphe slits on the primary side of the valve. Externally, a thin conopeum extends from the valve margin and covers the areolae, except those those areolae adjacent to the axial area. The conopeum can be observed only under SEM, but under LM, its margin is visible as a longitudinal line crossing the striae. The striae are slightly radiate in the valve center, becoming parallel near the apices.
Basionym: Navicula circumtexta
Author: Meister ex Hustedt in A. Schmidt et al. 1934
Length Range: µm
Striae in 10 µm:
Kiang Wau, Ostasien. Navicula circumtexta Meister, nov. spec. Die mittlere, von den Längslinien eingefaβte Schalenpartie lieft höher als die Randzone.
Patrick, R.M. and Reimer, C.W. (1966). The Diatoms of the United States exclusive of Alaska and Hawaii, V. 1. Monographs of the Academy of Natural Sciences of Philadelphia 13.
Schmidt, A. (-). (1874-1959). Atlas der Diatomaceen-Kunde, von Adolf Schmidt, continued by Martin Schmidt, Friedrich Fricke, Heinrich Heiden, Otto Muller, Friedrich Hustedt. Reprint 1984, Koeltz Scientific Books, Konigstein, 480 plates.
Witkowski, A., Lange-Bertalot, H. and Metzeltin, D. (2000). Diatom Flora of Marine Coasts I. Iconographia Diatomologica 7: 1-925.
NADED ID: 206001
Biremis corcumtexta is usually found in inland waters of high mineral content or in coastal habitats
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.