Family: Unicellular or Colonial; cell body spherical, with one or more spiny projections; a single cup-shaped chloroplast with a pyrenoid; asexual reproduction by zoospores or autospores; sexual reproduction by fertilization (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Unicells, planktonic; cell body spherical, surrounded by many elongated spiny projections, 1/3 from their base thickened, remainings hairly; a single chloroplast cup-shaped, with a pyrenoid (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
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A. zachariasii
cell 13 μm
spine 5.5 μm
Japan, 1998
A. zachariasii
cell μm
spine μm
O-ike park
Yabuki
Fukushima, 2003
A. zachariasii
cell 10 μm
spine 5.5 μm
Iwajuku
Gunma, 2001
A. zachariasii
cell μm
spine μm
S-M general park
Showa
Saitama, 2003
A. zachariasii
cell 17 μm
spine 7 μm
Shirahata-Numa
Urawa
Saitama, 2005
Acanthosphaera ?
cell 8.5 μm
spine 20 μm
Urawa
Saitama, 2001
A. zachariasii
cell 13 μm
spine 20 μm
Karasu-ga-mori p.
Nasu-shiobara
Tochigi, 2006
A. zachariasii ?
cell μm
Chiba Port Park
Chiba, 2003
