Hustedt 1927 Category: Centric
BASIONYM: Cyclotella distinguenda Hustedt 1927
Valves have a distinct circular center and a marginal ring of striae. The central area is approximately 1/3-1/2 of the valve face. The central area is tangentially undulate, with the degree of undulation ranging from slight to distinct. The central area is smooth, but may have verrucae or grooves on the valve surface. The marginal striae are broadest at valve/mantle interface and taper near the central area. A circular shadow line, appearing as a faint ring, crosses the striae. Under SEM, the striae are seen to be composed of 2-3 areolae near the center valve and 4-5 areolae toward the margin. Internally, the shadow line can be seen to be the image of the inner border of the internal alveolae openings. These openings are quite small in this taxon, so that striae are mostly occluded. Numerous marginal fultoportulae are evident. The fultoportulae are short, with 2 satellite pores. A single rimoportula is present on the valve mantle, with the internal opening oriented parallel to the margin.
Basionym: Cyclotella distinguenda
Author: Hustedt 1927
Diameter: 10-35 µm
Rows of areolae in 10 µm: 12-14
Cite This Page:
Lowe, R., and Manoylov, K. (2011). Cyclotella distinguenda. In Diatoms of the United States. Retrieved March 25, 2017, from http://westerndiatoms.colorado.edu/taxa/species/cyclotella_distinguenda
Species: Cyclotella distinguenda
Reviewer: Marina Potapova
Håkansson, H. (1989). A light and electronmicrosopical investigation of the type species of Cyclotella (Bacillariophyceae) and related forms, using original material. Diatom Research 4: 255-267.
Houk, V., Klee, R. and Tanaka, H. (2010). Atlas of freshwater centric diatoms with a brief key and descriptions, Part III. Stephanodiscaceae A. Cyclotella, Tertiarius, Discostella. Fottea 10 (Supplement): 1-498.
Hustedt, F. (1927). Die Diatomeen der interstadialen Seekreide. In: H. Gams, Die Geschichte der Lunzer Seen, Moore und Wälder. Internationale Revue der gesamten Hydrobiologie 18:305-387.
John, J. and Economou-Amilli, A. (1991). Morphology and ultrastructure of the centric diatom Cyclotella distinguenda . Diatom Research 6(2): 307-315. 10.1080/0269249X.1991.9705176
Kiss, K.T., Ács, É., Szabó, K.É., Miracle, M.R. and Vicente, E. (2007). Morphological observations on Cyclotella distinguenda Hustedt and C. delicatula Hustedt from the core sample of a meromictic karstic lake of Spain (Lake la Cruz) with aspects of their ecology. Diatom Research 22(2): 287-308. 10.1080/0269249X.2007.9705716
Kiss, K.T., Klee, R., Ector, L. and Ács, É. (2012). Centric diatoms of large rivers and tributaries in Hungary: morphology and biogeographic distribution. Acta Botanica Croatica 71: 311-363.
Krammer, K. and Lange-Bertalot, H. (1991). Bacillariophyceae. 3. Teil: Centrales, Fragilariaceae, Eunotiaceae. In Ettl, H., Gerloff, J., Heynig, H. & Mollenhauer, D. (Eds.). Süsswasserflora von Mitteleuropa. 2(3): 1-576. Gustav Fisher Verlag, Stuttgart, Germany.
This taxon is of broad occurrence in the plankton of lakes and large rivers and is known to prefer alkaline waters.
Girdle view of C. distinguenda initial valve, scale bar = 10 µm. Slide: Science Museum of Minnesota Diatom Collection, MBE 620. The sample was collected from Tiplady Bog, Hell, MI.
Credit/Source: Image by Edlund and Burge
Cyclotella distinguenda initial valve and maternal valve, scale bar = 10 µm. Slide: Science Museum of Minnesota Diatom Collection, MBE 620. The sample was collected from Tiplady Bog, Hell, MI.
Credit/Source: Image by Edlund and Burge
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.