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Gamophyceae: Zygnematales: Desmidiaceae

 Euastrum gnathophorum
W. et G.S. West

Euastrum gnathophorum Subgenus: Entomum (Apical area deeply indented or notched)
Section: Incisa (Cell surface smooth; apical area without spiny projections)
Species: Cell body 47-73 μm long, 34-36 μm wide, isthmus 11-14 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

Euastrum gnathophorum W. et G.S. West, cell body 63 μm long, 30 μm wide, isthmus 9 μm wide (?), x 640, Omine-numa (pond/marsh), Omine, Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, May 25, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Euastrum gnathophorum Euastrum gnathophorum
Cell body 66 μm long, 30 μm wide, isthmus ?? μm wide, x 640
Euastrum gnathophorum Euastrum gnathophorum Euastrum gnathophorum

Images of collecting locality: No.5/6, Omine-numa (pond/marsh), Omine, Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, May 25, 2006 by Y. Tsukii

Euastrum gnathophorum Lenormand var. gnathophorum: Cell body 60-74 μm long, 34-46 μm wide, isthmus 8-15 μm wide, (Illustrations of the Fresh-water Algae, 1977).

Euastrum gnathophorum var. germanicum (Raciborski) Lütkemüller: Cell body 59-78 μm long, 36.5-47.6 μm wide, isthmus 7-12.5 μm wide, L/W=1.5-1.75 (Illustrations of the Fresh-water Algae, 1977).

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