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Chlorophyceae: Chlorococcales: Oocystaceae

 Trochiscia sp.

Trochiscia Genus: Unicells; cell body spherical in shape; cell wall warty or wrinkled (Illustrations of The Japanese Fresh-water Algae, 1977).
Cell wall with warts or a network of ridges or lines (Dillard, Common Freshwater Algae of the United States, J. Cramer 1999).
Species:

Trochiscia sp. (or Acanthosphaera sp. or similar species ?), cell body nearly spherical, 43 μm in diam., spiny projections about 7 μm long, spiny projections are interconnected with filamentous or plate-like structures, x 640, used waterfield near Karakemi marsh (Yasaka village), Matsuzaki, Omachi city, Nagano Pref., Japan, April 24, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
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Cell body nearly spherical, 42 μm in diam., spiny projections about 18 μm long, x 640
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Cell body nearly spherical, about 36 μm in diam., spiny projections about 18 μm long, x 640
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Cell body nearly spherical, 45 μm in diam., spiny projections about 24 μm long, x 640
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Cell body nearly spherical, 36 μm in diam., spiny projections (about 6 μm long) are truncated anteriorly forming outer layer with honeycomb structures, x 640
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Cell body nearly spherical, 46 μm in diam., spiny projections about 20 μm long, x 640
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Cell body nearly spherical, 45 μm in diam., spiny projections about 25 μm long, x 400, x 640
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Cell body nearly spherical, 40 μm in diam., spiny projections about 20 μm long, x 640
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