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Gamophyceae: Zygnematales: Desmidiaceae

 Arthrodesmus incus
(Brébisson) Hassall var. incus
= Staurodesmus incus (Brébisson) Teiling 1967

Arthrodesmus incus 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: Semicells inverted semicircle or hexagon in shape; (Illustrations of The Japanese Fresh-water Algae, 1977).

Arthrodesmus incus (Brébisson) Hassall var. incus (or A. extensus ?), cell body 19 μm long, 23 μm wide, L/W=0.8 (including spines), cell body 11 μm long, 8 μm wide, L/W=1.4 (excluding spines), isthmus 4 μm wide, x 640, Yakebe-ike (pond), Sayama park, Higashi-Murayama city, Tokyo, Japan, February 11, 2006 by Y. Tsukii
Arthrodesmus 31 μm Arthrodesmus 63 μm Arthrodesmus 94 μm; x 640
Arthrodesmus incus Arthrodesmus incus Arthrodesmus incus

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