(Brébisson) Lange-Bertalot and Krammer 1996 Category: Symmetrical biraphid
BASIONYM: Navicula crassinervia Brébisson in W. Smith 1853
SYNONYM(S): Frustulia rhomboides var. crassinervia (Brébisson) Ross | Navicula rhomboides var. crassinervia (Brébisson) Grunow
Valves are rhomboid with undulate margins. Apices are narrowly rounded and moderately protracted. Both the longitudinal ribs and the raphe are slightly curved. The ribs are slightly constricted at the central nodule. The longitudinal striae are wavy, but not prominent. Striae are fine and mostly parallel; in some valves the striae are wavy along the length of the valve. At the apices, the striae are difficult to discern, but appear to be present in some specimens. The longitudinal ribs and helictoglossae fuse to form a small porte-crayon.
Images of F. crassinervia (Lange-Bertalot 2001, pl. 127, figs 7-15) suggest that the species has striae that circumradiate the apices.
Basionym: Navicula crassinervia
Author: Brébisson in W. Smith 1853
Length Range: µm
Striae in 10 µm:
Cite This Page:
Kociolek, P., and Graeff, C. (2011). Frustulia crassinervia. In Diatoms of the United States. Retrieved March 29, 2017, from http://westerndiatoms.colorado.edu/taxa/species/frustulia_crassinervia
Species: Frustulia crassinervia
Reviewer: Marina Potapova
Lange-Bertalot, H. (2001). Navicula sensu stricto, 10 genera separated from Navicula sensu lato, Frustulia. Diatoms of Europe 2: 1-526.
Lange-Bertalot, H. and Metzeltin, D. (1996). Indicators of oligotrophy - 800 taxa representative of three ecologically distinct lake types, Carbonate buffered - Oligodystrophic - Weakly buffered soft water. Lange-Bertalot, H. (ed.), Iconographia Diatomologica. Annotated Diatom Micrographs. Vol. 2. Ecology, Diversity, Taxonomy. Koeltz Scientific Books. Königstein, Germany, 2:390 pp.
Smith, W. (1853). Synopsis of British Diatomaceae. John Van Voorst, London 1853. 89 pp., pls 1-31.
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.