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Chlorophyceae: Chlorococcales: Chlorococcaceae (Oocystaceae)

 Tetraedron incus
(Teiling) G.M. Smith var. irregulare G.M. Smith

Tetraedron 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).
Similar genus -->> Tetraedriella (Xanthophyceae); Goniochloris (Xanthophyceae);

Tetraedron incus (Teiling) G.M. Smith var. incus (Syn. T. regulare var. incus Telling), cell body 39 μm long (including spiny projections), 640, Shikinawa-ike (pond, near Kayoicho Park), Kasuya town, Fukuoka Pref., Japan, October 2001 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Tetraedron Tetraedron Tetraedron

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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