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Chlorophyceae: Zygnematales: Mesotaeniaceae or Gonatozygaceae
(Gamophyceae: Zygnematales: Desmidiaceae)

Gonatozygon brebissonii
de Bary

Gonatozygon Genus: Two chloroplasts plate-like or slightly spiralled; a nucleus centrally located between the chloroplasts; mostly unicells, filaments rare (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Cell body constricted near the both ends, (68-160)-288 μm long, (7-8)-10.8 μm wide, L/W = 10-16, cell wall densely granulated (Illustrations of The Japanese Fresh-water Algae, 1977).

Gonatozygon brebissonii de Bary, cell body 110 μm long, 8 μm wide, L/W=13.8, x 640, riverside at Satsunai river, Obihiro city, Hokkaido, Japan, October 15, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Gonatozygon brebissonii Gonatozygon brebissonii Gonatozygon brebissonii

* Gonatozygon brebissonii var. echinatum Krieger: cell body cylindrical 96-140 μm long, 5-(5.5-7.5) μm wide, L/W = 15-20, cell wall covered with many fine hairs, both ends slightly swelled (Illustrations of The Japanese Fresh-water Algae, 1977).

Gonatozygon brebissonii Wolle var. brebissonii: cell body cylindrical 177-(180)-300 μm long, 10.5-15-(15.5) μm wide, L/W = 12-20, cell wall covered with many hairly spines, both ends slightly swelled (Illustrations of The Japanese Fresh-water Algae, 1977).

Gonatozygon monotaenium de Bary: cell body cylindrical (74-145)-284 μm long, 7.5-(9)-11.5 μm wide, L/W = 10-25, cell wall with many granules, both ends slightly swelled (Illustrations of The Japanese Fresh-water Algae, 1977).

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