(Ehrenberg) R. Ross in Hartley 1986 Category: Centric
BASIONYM: Gaillonella lirata Ehrenberg 1843
SYNONYM(S): Melosira lirata (Ehrenberg) Kützing | Melosira distans f. lirata (Ehrenberg) O. Müller | Aulacoseira distans var. lirata (Ehrenberg) Simonsen
Frustules are thick, cylindrical and form short colonies. Valves 6-23 µm in diameter, with a mantle height of 5-14 µm. The ratio of the mantle height to valve diameter is close to 1. The mantle has straight sides. The valve face is flat. Rows of coarse round or elliptical pervalvar areolae are straight, parallel to the pervalvar axis or slightly curved to the right (dextrorse) and number 7-13 in 10 µm. There are 7-10 areolae in 10 µm within a row, some areolae may be missing. The areolae closest to the collum are often the largest. The valve face is unornamented except for one row of marginal areolae. Spines are branching at their apices. The ringleiste is solid and variable in thickness, from moderately shallow to rather deep.
Basionym: Gaillonella lirata
Author: Ehrenberg 1843
Length Range: µm
Striae in 10 µm:
G. lirata, habitu G. granulatae, lineis validioribus liratim continuis.
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Ehrenberg, C.G. (1843). Verbreitung und Einfluß des mikroskopischen Lebens in Süd- und Nord-Amerika. Abhandlungen der Königlichen Akademie der Wissenschaften zu Berlin, 1841: 291-445, 4 Tafel.
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Hartley, B. (1986). A check-list of the freshwater, brackish and marine diatoms of the British Isles and adjoining coastal waters. Journal of the Marine Biological Association of the United Kingdom 66: 531-610.
Krammer, K. (1991). Morphology and taxonomy of some taxa in the genus Aulacoseira Thwaites (Bacillariophyceae). I. Aulacoseira distans and similar taxa. Nova Hedwigia 52(1-2):89-112.
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Sampling for 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). Streams and rivers in 12 western states (Arizona, California, Colorado, Idaho, Montana, Nevada, North Dakota, Oregon, South Dakota, Utah, Washington and Wyoming). Over 1200 sites on 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.