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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 sp. (P. erinaceoides ?), cell body 23 μm in diam., spiny projections up to 9 μm long, x 640, used waterfield near Karakemi marsh (Yasaka village), Matsuzaki, Omachi city, Nagano Pref., Japan, April 24, 2005 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400
Pterocystis Pterocystis

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