(Brébisson) Rabenhorst 1853 Category: Symmetrical biraphid
BASIONYM: Frustulia lata Brébisson 1838
SYNONYM(S): Pinnularia lata (Brébisson) W. Smith 1853
Contributor: Loren Bahls - March 2014
Length Range: 80-128 µm
Width Range: 23.2-28.7 µm
Striae in 10 µm: 3-4
Valves are linear-elliptic in outline with parallel or slightly convex sides. Larger specimens are somewhat tumid in the middle. Apices are obtusely rounded. The axial area is linear and one-fifth to one-third the valve width. The central area is a rounded asymmetric widening of the axial area. The raphe is broadly lateral and nearly straight, slightly curved in the middle. Near the central nodule the raphe branches are deflected to one side and become filiform. Proximal raphe ends are large and rounded. Distal raphe ends are hook-shaped. The broad, coarse striae are radiate at valve center, becoming parallel or convergent near the apices.
Basionym: Frustulia lata
Author: Brébisson 1838
Length Range: µm
Striae in 10 µm:
Brébisson, A. de. (1838). Considérations sur les Diatomées et essai d’une classification des genres et des espèces appartenant à cette famille. Brée l'Ainé Imprimeur-Libraire, Falaise. 22 pp.
Krammer, K. (1992). Die Gattung Pinnularia in Bayern. Hoppea 52: 1-308.
Krammer, K. (2000). The genus Pinnularia. The Diatoms of Europe. Diatoms of Inland Waters and Comparable Habitats 1: 1-703.
Krammer, K. and Lange-Bertalot, H. (1986). Bacillariophyceae. 1. Teil: Naviculaceae. In: Ettl, H., J. Gerloff, H. Heynig and D. Mollenhauer (eds.) Süsswasserflora von Mitteleuropa, Band 2/1. Gustav Fisher Verlag, Jena. 876 pp.
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.
Rabenhorst, L. (1853). Die Süßwasser-Diatomaceen (Bacillarien) für Freunde der Mikroskopie. Leipzig, 72 pp.
Smith, W. (1853). Synopsis of British Diatomaceae. John Van Voorst, London 1853. 89 pp., pls 1-31.
The specimens of Pinnularia lata pictured on this web page were collected from a small lake in the mountains of Haida Gwaii, British Columbia. Krammer (2000) reports this species as widely distributed in northern alpine regions in cool, oxygen-rich, oligotrophic waters with a low electrolyte content, and often found in aerial habitats, seepages over rocks and moss beds, and in torrents.
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.