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).

T. incus 35 μm Shinobazu-ike Ueno Tokyo, 2001	T. incus or Goniochloris ? 39 μm Shikinawa-ike Fukuoka, 2001	T. incus 38 μm Shikinawa-ike Fukuoka, 2001	T. incus 40 μm Sue-machi Fukuoka, 2001
T. incus ? μm O-ike park Yabuki Fukushima, 2003	T. incus μm Kenmin-kenko f.m. Koshigaya Saitama, 2006

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

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