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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 21 μm long, 16 μm wide (excluding spines), L/W=1.3, isthmus 7 μm wide, spines cell body up to 15 μm long, x 640, Ushidome-ike (pond), Norikura highland, Azumi, Matsumoto city, Nagano Pref., Japan, November 4, 2007 by Y. Tsukii
Arthrodesmus 31 μm Arthrodesmus 63 μm Arthrodesmus 94 μm; x 640
Arthrodesmus incus Arthrodesmus incus

Images of collecting locality: Ushidome-ike (pond), Norikura highland, Azumi, Matsumoto city, Nagano Pref., Japan, November 4, 2007 by Y. Tsukii

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