Family: Colonial; cell body spherical; without pseudo-flagella (immobile); chloroplasts one, 2 or 3 in number, with or without pyrenoids (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Colony within a gelatinous bag; cells uniformly arranged at the peripheral matrix; cell body spherical or ellipsoidal without pseudo-flagella; 2-4 cells form a small subset; a single chloroplast cup-shaped, with a pyrenoid (Guide book to the "Photomicrographs of the Freshwater Algae", 1998). Small colonies planktonic or large ones attached to other substrates (Illustrations of The Japanese Fresh-water Algae, 1977).

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Palmella sp. cell μm Senjo-ga-hara Nikko Tochigi, 2003	Palmella sp. cell 8-10 μm Komado marsh Showa and Tajima Fukushima, 2004	Palmella sp. cell μm Takasaki park Takasaki Gunma, 2004
Palmella or Sphaerocystis ? cell 5.5 μm Kaga Ishikawa, 2000	Palmella or Sphaerocystis ? cell 7.5 μm Umi-no-nakamichi Fukuoka, 2001	Palmella or Planktosphaeria ? cell μm Sashi-ohgi Saitama, 2002	Palmella sp. ? cell μm Matsubushi Saitama, 2003
Palmella ? cell 10-12 μm Yaku Island Kagoshima, 2001

Similar genus -->> Tetraspora;

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