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Gamophyceae: Zygnematales: Desmidiaceae

 Arthrodesmus extensus
var. elongatus Hirano
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:

Arthrodesmus extensus var. elongatus Hirano, cell body 17 μm long, 13 μm wide, L/W=1.3, isthmus 5 μm wide, spines up to 11 μm long, x 640, Tane-ike (pond), Togakushi highland, Shinano town, Nagano Pref., Japan, June 12, 2005 by Y. Tsukii
Arthrodesmus 31 μm Arthrodesmus 63 μm Arthrodesmus 94 μm; x 640
Arthrodesmus extense Arthrodesmus incus Arthrodesmus incus Arthrodesmus incus

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