(Lemmermann) Simonsen 1979 Category: Centric
BASIONYM: Melosira herzogii Lemmermann 1910
Frustules are cylindrical and form short colonies, usually of two frustules. Valves are 3-7 µm in diameter and have a mantle height between 7-14 µm. The ratio of mantle height to valve diameter is either equal to, or greater than, 1. The mantle is straight and the valve face is either flat or slightly radially undulate with a concave center. Small areolae are present on the valve face. The straight rows of mantle areolae are often not resolvable in LM and number 30-32 per 10 µm. These small areolae, if visible in the light microscope, appear circular, although they are irregularly shaped under SEM and number 27-37 per 10 µm along the pervalvar row. Two diametrically opposed grooves, containing no areolae, extend the entire length of the valve. Two large, pointed separation spines diametrically opposed on the valve face extend in the plane of the mantle onto grooves of the neighboring frustules. The planes of the large spines and the grooves are at right angles to each other. Smaller, broadly pointed spines are present at the end of each costa. No valves with linking spines have been observed. The ringleiste is relatively shallow. According to Hickel & H. Håkansson (1991) the number of spines may be 2-4, but specimens that we observed from the U.S. had 2 spines.
Basionym: Melosira herzogii
Author: Lemmermann 1910
Length Range: µm
Striae in 10 µm:
Cellulae subcylindricae, singulae vel filamenta 2—4 cellu-laria, recta vel leviter curvata formantes, 6—6,5 μ latae, 30—36 μ longae. Discus subcircularis, margine duas spinas rectas, 15—16 μ longas praeditus. Spinae discorum conjunctorum cruciatim dis-positae. Pseudosulcus distinctus. Pori minutissimi, difficile ad cognoscendum. Phaeophora numerosa, disciformes, rotundatae vel oblongae, parietales.
Cite This Page:
Potapova, M., and English, J. (2010). Aulacoseira herzogii . In Diatoms of the United States. Retrieved July 24, 2014, from http://westerndiatoms.colorado.edu/taxa/species/aulacoseira_herzogii
Species: Aulacoseira herzogii
Reviewer: Mark Edlund
Camburn, K.E. and Kingston, J.C. (1986). The genus Melosira from soft-water lakes with special reference to northern Michigan, Wisconsin and Minnesota. In: Diatoms and Lake Acidity, J.P. Smol, R.W. Battarbee, R.B. Davis & J. Meriläinen (eds), Dr W. Junk Publishers, Dordrecht. pp. 17-34.
Hickel, B. and Håkansson, H. (1991). The freshwater diatom Aulacoseira herzogii. Diatom Research 6: 299-305.
Jewson, D.H., Khondker, M., Rahman, M.H. and Lowry, S. (1993). Auxosporulation of the freshwater diatom Aulacoseira herzogii in Lake Banani, Bangladesh. . Diatom Research 8: 403-418.
Lemmermann, E. (1910). Beitrage zur Kenntnis der Planktonalgen. XXVI-XXX. (Das Phytoplankton des Paraguay). Archiv für Hydrobiologie und Planktonkunde, Stuttgart 5:291-338.
Simonsen, R. (1979). The diatom system: ideas on phylogeny. Bacillaria 2: 9-71.