Family: Colonies of a fixed number of cells (4, 8, 16, 32, or more) arranged 2- or 3-dimensionally; cells spherical, ellipsoidal, polygonal, etc. in shape; chloroplasts 1 or several, plate-like in shape, with 1 pyrenoid; asexual reproduction by autocoenobium (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Colonies, 3-dimensional; cell body cylindrical or long spindle in shape, radially arranged by attaching at one end to each other (Illustrations of The Japanese Fresh-water Algae, 1977).

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A. hantzschii var. hantzschii cell 19 x 3 μm Japan, 1997	A. hantzschii var. hantzschii cell 14 x 2 μm Mihashi Park Saitama Saitama, 2005	A. hantzschii ? var. hantzschii ? cell 8 x 1.5 μm Uruguay, 1999
A. hantzschii var. fluviatile cell 40 x 7 μm Japan, 1997	A. hantzschii var. fluviatile 16 x 2.3 μm Japan, 2000	A. hantzschii var. fluviatile 23 x 3 μm Jizoh-bori Sannoh Park Saitama, 2005	A. hantzschii var. fluviatile 25 x 3 μm Nakai-numa m. Yoshikawa Saitama, 2006
A. hantzschii var. fluviatile cell 13 x 1.7 μm Saitama, 1999	A. hantzschii var. fluviatile ? cell 14 x 1.5 μm Yamagata, 1999	A. hantzschii var. fluviatile ? 12-20 x 1.5-3 μm Koriyama Fukushima, 2001	A. hantzschii var. fluviatile ? or A. gracillimum ? cell 16 x 2 μm Shakujii Park Tokyo, 2001
A. hantzschii var. fluviatile ? or A. raphidioides ? cell 16 x 2 μm Ueno Tokyo, 2001	A. hantzschii var. fluviatile ? or A. raphidioides ? cell 20 x 3 μm Shobu Saitama, 2004	A. hantzschii var. fluviatile ? or A. raphidioides ? cell 20 x 2 μm Sue-machi Fukuoka, 2001	A. hantzschii var. fluviatile ? or A. raphidioides ? cell 25 x 3 μm Mihashi Park Saitama, 2002
A. hantzschii var. fluviatile ? cell 20 x 2 μm near Town Hall Shobu Saitama, 2004	A. hantzschii var. fluviatile ? cell 25 x 2.5 μm Shirahata-Numa Urawa Saitama, 2005	A. hantzschii var. fluviatile ? cell 25-28 x 2.5 μm Shinrin-koen Namegawa Saitama, 2005

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