(Kützing) Cleve 1894 Category: Symmetrical biraphid
BASIONYM: Navicula elliptica Kützing 1844
Contributor: Brina Kamae - June 2015
Length Range: 30-65 µm
Width Range: 17-36 µm
Striae in 10 µm: 9-10
Valves are elliptic, with convex margins and rounded apices. The axial area is narrow-lanceolate, expanding slightly from the apices to the central area. The central area is large and round. Longitudinal canals are present on both sides of the axial and central areas. Longitudinal canals are widest near the central area and narrow towards the valve apices. The raphe is straight with expanded proximal raphe ends. Terminal raphe fissures deflect unilaterally, terminating short of the valve margin. Striae are radiate mid-valve, becoming strongly radiate towards the apices. Striae composed of complex, round to rectangular areolae. Striae are uniseriate. Areolae number 11-14 in 10 µm. Usually one row of areolae is positioned along the longitudinal canal, but in some specimens, two rows may occur.
Basionym: Navicula elliptica
Author: Kützing 1844
Length Range: µm
Striae in 10 µm: 12-13
Cleve, P.T. (1894). Synopsis of the Naviculoid Diatoms, Part I. Kongliga Svenska-Vetenskaps Akademiens Handlingar 26(2):1-194, 5 pls.
Jovanovska, E., Levkov, Z., and Edlund, M.B. (2015). The genus Diploneis Ehrenberg ex Cleve (Bacillariophyta) from Lake Hövsgöl, Mongolia. Phytotaxa, in press.
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.
Kützing, F.T. (1844). Die kieselschaligen Bacillarien oder Diatomeen. Nordhausen. 152 pp., 30 pls.
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.
Diploneis elliptica was found in a benthic sample in Cold Creek, San Bernardino County, California. Diploneis elliptica was also found in mud surface and moss squeeze in Excelsior Fen, Dickinson County, Iowa. The genus Diploneis is typically associated with epipelon and can be found in freshwater, brackish, and marine environments (Cleve 1894).
Other distributional and ecological records include Iceland, Sweden, Finland, Germany, England, New Zealand, North America, and Ecuador (Cleve 1894). In a collection from Lake Hövsgöl, an ancient and large freshwater lake in north-central Mongolia, 25 Diploneis taxa were identified (Jovanovska et al. 2015). Diploneis elliptica was found on sand, epipelon, sediments, marl habitats, and epiphytic on Chara, a green algae (Jovanovska et al. 2015).
Distribution of Diploneis elliptica in rivers of the continental U.S. based on the National Water Quality Assessment program. Retrieved 16 June 2015.
Credit/Source: USGS BioData
Distribution of Diploneis elliptica in rivers of Alaska based on the National Water Quality Assessment program. Retrieved 16 June 2015.
Credit/Source: USGS BioData
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.