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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, cell body 20 μm long, 18 μm wide, L/W=1.1, isthmus 8 μm wide, spines up to 9 μm long, x 640, Ushidome-ike (pond), Norikura highland, Azumi village, Nagano Pref., Japan, May 28, 2005 by Y. Tsukii
Arthrodesmus 31 μm Arthrodesmus 63 μm Arthrodesmus 94 μm; x 640
Arthrodesmus incus Arthrodesmus incus Arthrodesmus incus
Cell body 18 μm long, 16 μm wide, L/W=1.1, isthmus 8 μm wide, spines up to 5 μm long, x 640
Arthrodesmus incus
Cell body 20 μm long, 16 μm wide, L/W=1.3, isthmus 8 μm wide, spines up to 12 μm long, x 640
Arthrodesmus incus

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