(Agardh) Cleve in Schmidt et al. 1893 Category: Symmetrical biraphid
BASIONYM: Frustulia elliptica Agardh 1824
Contributor: Loren Bahls - January 2012
Length Range: 17-57 µm
Width Range: 8.1-12.8 µm
Striae in 10 µm: 15-18
Valves are elliptical to linear-elliptical with convex to nearly parallel sides and blunt, obtusely rounded apices. The axial area is narrow, barely wider than the raphe, and the central area is circular. Raphe branches are lateral and sinuous, with weakly expanded proximal ends. Partecta are numerous and all about the same size. Striae consist of single rows of areolae and are radiate throughout. Areolae are coarse and number 16-20 in 10 µm.
Basionym: Frustulia elliptica
Author: Agardh 1824
Length Range: µm
Striae in 10 µm:
Agardh, C.A. (1824). Systema algarum. Literis Berlingianis, pp. 1-312.
Krammer, K. and Lange-Bertalot, H. (1986). Bacillariophyceae. 1. Teil: Naviculaceae. In: Ettl, H., J. Gerloff, H. Heynig and D. Mollenhauer (eds.) Susswasserflora 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.
Schmidt, A. (-). (1874-1959). Atlas der Diatomaceen-Kunde, von Adolf Schmidt, continued by Martin Schmidt, Friedrich Fricke, Heinrich Heiden, Otto Muller, Friedrich Hustedt. Reprint 1984, Koeltz Scientific Books, Konigstein, 480 plates.
There are 156 records of Mastogloia elliptica in the Montana Diatom Collection, nearly all of them from streams on the Northwestern Great Plains. The mean electrical conductivity of these waters is 3824 μS/cm, mean chloride is 83 mg/L, and mean pH is 8.6. However, in some of these waters such as Salt Creek in Wyoming, conductivity may range up to 45700 μS/cm and chloride content up to 13200 mg/L. Common diatom associates of M. elliptica on the Great Plains include Cymbella pusilla, Mastogloia smithii, Nitzschia microcephala, Navicula peregrina, Tabularia fasciculata, Amphora coffeaeformis, Entomoneis paludosa, and Ctenophora pulchella. Patrick and Reimer (1986) report M. elliptica as a halophilic to mesohalobic taxon characteristic of coastal areas, but also found in inland lakes with some salinity. In Europe, Krammer and Lange-Bertalot (1986) report M. elliptica from brackish waters in coastal areas and from saline inland waters.
Stockade Beaver Creek below Salt Creek, Weston County, Wyoming: home of Mastogloia elliptica.
Credit/Source: Photo courtesy Wyoming DEQ.