Chlorophyceae:
Chlorococcales: Chlorococcaceae (Oocystaceae)
Tetraedron incus
(Teiling) G.M. Smith var. irregulare G.M. Smith
Genus: Cell body short, radiate in shape; apical view of the cell, triangular, polygonal,
ellipsoidal or spindle-shaped; zygospores formed outside of mother cells
(Illustrations of The Japanese Fresh-water Algae, 1977).
Species [ var. irregulare ]: Unicells, planktonic; cell body flat, subpyramidate, 10-17 μm long;
two sides shallowly and the other two sides deeply concave;
angles tapered into long, straight or slightly curved spines (10-29 μm long);
cell wall smooth; a single chloroplast plate-like, with a pyrenoid
(Photomicrographs of the Freshwater Algae, vol. 17, 1996).
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Similar genus -->>
Tetraedriella (Xanthophyceae);
Goniochloris (Xanthophyceae);
Tetraedron incus
(or Goniochloris fallax, Pleurochloridaceae, Mischococcales, Xanthophyceae ??),
cell body 35 μm long (including spiny projections),
x 400, x 640, Shinobazu-ike (pond), Ueno, Taito-ku, Tokyo, Japan, March 2001 by Y. Tsukii
50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
T. incus var. incus:
Unicells, planktonic; cell body flat, quadrangular in shape, 5-12 μm long;
two sides shallowly and the other two sides deeply concave;
angles tapered into long, straight spines (5-15 μm long);
cell wall smooth; a single chloroplast plate-like, with a pyrenoid
(Photomicrographs of the Freshwater Algae, vol. 17, 1996).
* T. incus var. irregulare:
Unicells, planktonic; cell body flat, subpyramidate, 10-17 μm long;
two sides shallowly and the other two sides deeply concave;
angles tapered into long, straight orslightly curved spines (10-29 μm long);
cell wall smooth; a single chloroplast plate-like, with a pyrenoid
(Photomicrographs of the Freshwater Algae, vol. 17, 1996).
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