Brutschy 1922 Category: Araphid
BASIONYM: Synedra cyclopum Brutschy 1922
SYNONYM(S): Fragilaria cyclopum (Brutschy) Lange-Bertalot 1980
Contributor: Loren Bahls - May 2012
Length Range: 31-70 µm
Width Range: 3.2-7.3 µm
Striae in 10 µm: 15-18
Valves are linear to linear-lanceolate and arcuate, with gradually attenuated subcapitate ends. The axial area is linear and very narrow, widening near the central area. The central area is longer than broad, extends to the valve margins, and often contains ghost striae. The central area is not swollen and may be slightly indented on the concave side of the valve in smaller specimens. Areolae in the striae are indistinct in LM.
Basionym: Synedra cyclopum
Author: Brutschy 1922
Length Range: µm
Striae in 10 µm:
Brutschy, A. (1922). Die Vegetation und der Zooplankton des Hallwiler Sees. Internationale Revue der gesamten Hydrobiologie 10: 91-138, 271-298. 10.1002/iroh.19220100108
Gaiser, E.E. and Bachmann, R.W. (1993). The ecology and taxonomy of epizoic diatoms on Cladocera. Limnology and Oceanography, 38 (3): 628-637. http://www.jstor.org/discover/10.2307/2838037?uid=3739560&uid=2134&uid=2&uid=70&uid=4&uid=3739256&sid=56227186023
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.
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.
Synedra cyclopum is uncommon and widely dispersed in the plankton of lakes and reservoirs (and in streams below lakes and reservoirs) in the western United States. Patrick and Reimer (1966) report that it is often attached to crustacea in cool water. In Europe, Krammer and Lange-Bertalot (1991) report it from lakes of medium electrolyte content, where it lives on copepods.
Gates of the Mountains on the Missouri River below Hauser Dam, Lewis and Clark County, Montana: home of Synedra cyclopum.
Credit/Source: Loren Bahls