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Chlorophyceae: Chlorococcales: Micractiniaceae

Acanthosphaera zachariasii
Lemmermann var. zachariasii

Heliozoa 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).
Species: Cell body spherical, 8-15 μm in diam., spiny projections 30-38 μm long (Introduction to the Freshwater Algae, 1999).

Acanthosphaera zachariasii (or Trochiscia sp. ?), cell body spherical, μm in diam., x 640, Chiba Port Park, Chiba City, Chiba Pref., Japan, July 2003 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
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