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Gamophyceae: Zygnematales: Desmidiaceae

 Arthrodesmus extensus
(Anderson) Hirano var. extensus (Illustrations of The Japanese Fresh-water Algae, 1977)
(Anderson) Borge var. extensus (John et al. ed. 2002; Coesel & Meesters 2007)
= Staurodesmus extensus (Borge) Teiling 1948

Arthrodesmus extensus Genus: Cell body small, length = width, strong constriction at its center; semicells inverted triangular, ellipsoidal, rectangular, etc. in shape; straight or slightly curved spiny projections at each corner; one pyrenoid in each semicell; cell wall smooth (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: (Illustrations of The Japanese Fresh-water Algae, 1977).

Arthrodesmus extensus (Anderson) Hirano extensus, cell body μm long, μm wide, L/W=, isthmus μm wide, x 640, No.2, Kannon-numa Forest Park (pond), Shimogo town, Fukushima Pref., Japan, November 15, 2008, by Y. Tsukii
Arthrodesmus 31 μm Arthrodesmus 63 μm Arthrodesmus 94 μm; x 640
Arthrodesmus extensus Arthrodesmus extensus
Cell body μm long, μm wide, L/W=, isthmus μm wide, x 640
Arthrodesmus extensus Arthrodesmus extensus

Images of collecting locality: No.2, Kannon-numa Forest Park (pond), Shimogo town, Fukushima Pref., Japan, November 15, 2008, by Y. Tsukii

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