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Gamophyceae: Zygnematales: Desmidiaceae

 Arthrodesmus convergens
Ehrenberg ex Ralfs
= Staurodesmus convergens (Ehrenberg ex Ralfs) Teiling 1948 (Ling & Tyler 2000; John et al. ed. 2002)
= Staurodesmus convergens (Ehrenberg ex Ralfs) S. Lillieroth (Coesel & Meesters 2007)

Arthrodesmus sublatus 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 convergens Ehrenberg var. convergens, cell body 33 μm long, 38 μm wide, L/W=0.9 (excluding spiny projections 10 μm), 54 μm wide, L/W=0.6 (including spiny projections), isthmus 9 μm wide, x 640, Maimeno-ike (pond), Norikura highland, Azumi, Matsumoto city (formerly Azumi village), Nagano Pref., Japan, June 8, 2006 by Y. Tsukii
Arthrodesmus 31 μm Arthrodesmus 63 μm Arthrodesmus 94 μm; x 640
Arthrodesmus Arthrodesmus

Arthrodesmus convergens Ehrenberg var. convergens, cell body 31 μm long, 33 μm wide, isthmus 9 μm wide (excluding spines), spiny projections 11 μm long, x 640, Maimeno-ike (pond), Norikura highland, Azumi, Matsumoto city (formerly Azumi village), Nagano Pref., Japan, June 8, 2006 by Y. Tsukii
Arthrodesmus 31 μm Arthrodesmus 63 μm Arthrodesmus 94 μm; x 640
Arthrodesmus convergens Arthrodesmus convergens Arthrodesmus convergens

Images of collecting locality: Maimeno-ike (pond), Norikura highland, Azumi, Matsumoto city (formerly Azumi village), Nagano Pref., Japan, June 8, 2006 by Y. Tsukii

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