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Heliozoea: Centrohelida

 Pterocystis sp.
Siemensma & Rijackers, 1988

Pterocystis Genus: Free-living; skeleton with or without coat; cuirass made of scales and of the basal part of the spicules; coat indistinguishable (Illustrated Guide, 1985). Siliceous scales arranged tangentially and radiating siliceous spines with pointed or bifurcated ends; (Kudo, 1966).
Species:

Pterocystis (or Choanocystis ?), cell body spherical, 20-25 μm in diam., axopodia up to 65 μm long, spines up to 8 μm long, x 640, Iruma river, Sayama city, Saitama Pref., Japan, January 25, 2004 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400
Pterocystis Pterocystis Pterocystis Pterocystis Pterocystis Pterocystis Pterocystis

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