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Gamophyceae: Zygnematales: Desmidiaceae

Euastrum affine
Ralfs

Euastrum Subgenus: Entomum (Apical area deeply indented or notched)
Section: Incisa (Cell surface smooth; apical area without spiny projections)

Species: Cell body elongated ellipsoidal, 98-117-(123) μm long, 53-64-(67) μm wide, L/W=2; semicells consisting of five lobes (one terminal, four lateral); bay opening between terminal and anterior lateral lobe is deep and narrow; anterior lateral lobes smaller than posterior one; posterior lobes with slight depressions; terminal lobe laterally extended and apically flattened; semicell with 5 bulges (2 anterior, 3 posterior), 1 pore present between the anterior bulges (Illustrations of The Japanese Fresh-water Algae, 1977).
Similar genus -->> E. affine, E. humerosum, E. pinnatum


Euastrum affine (Greville) Ralfs var. affine, cell body 136 μm long, 64 μm wide, isthmus 20 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 affine Euastrum affine

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


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