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Chlorophyceae: Chlorococcales: Micractiniaceae

Acanthosphaera zachariasii
Lemmermann var. zachariasii

Acanthosphaera 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 10 μm in diam., spines short, 5.5 μm long, x 640, Kanokawa-numa (pond), Iwajuku, Kasakake town, Gunma Pref., Japan, October 2001 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Acanthosphaera zachariasii Acanthosphaera zachariasii

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