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)
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:
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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
31 μm
63 μm
94 μm; x 640
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
31 μm
63 μm
94 μm; x 640
Images of collecting locality:
Maimeno-ike (pond), Norikura highland, Azumi, Matsumoto city (formerly Azumi village), Nagano Pref., Japan, June 8, 2006 by Y. Tsukii
Please click on images for viewing enlarged.
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