Family: Unicells; cell body spherical or broad ellipsoidal; chloroplasts 1 to several in number, cup-shaped or plate-like, reticulated or star-shaped; with or without pyrenoids; reproduction by autospores and zoospores; many species found in soil (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Unicellular, planktonic; cell body spindle-shaped, with both ends drawn out to a elongated spiny projections; a single chloroplast plate-like in shape, with a pyrenoid (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
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A. ancora ?
102 x 6 μm
Yamagata, 1999
Ankyra sp.
μm
S-M Showa
Showa
Saitama, 2003
Ankyra sp. ?
155 x 5 μm
Shirahata-Numa
Urawa
Saitama, 2005
