Genus: Greater part of axopodia and cell body covered by a thick gelatinous mantle (Kudo, 1966).
Sphaerastrum sp. (or Raphidiophrys sp. ?),
cell body 28 μm in diam., coats about 8 μm in thickness,
axopodia up to 30 μm wide,
x 640, Suiren-numa (pond), near Hakkoda mountain, Towada city (formerly Towadako town), Aomori Pref., Japan, July 17, 2005 by Y. Tsukii
94 μm; x 640