Family: Unicells or cells loosely attached forming hyphae; cell body varied in shape, a constriction at the center in most species; cell walls consisting of two or more parts, with small pores and various ornaments (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Cell body flat, constricted at the center; semicell with 2 or 4 thick spiny projections; cells attached with each other at the center of their apex forming a filament, spiny projections extending over the adjoining cell.
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Similar genus -->> Sphaerozosma;
O. laeve
17 x 23 μm
Uruguay, 1999
O. filiformis
12 x 14 μm
USA, 1999
O. filiformis
12 x 9 μm
USA, 1999
