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Heliozoea: Centrohelida

 Choanocystis aculeata
(Hertwig & Lesser, 1874) Siemensma & Roijackers, 1988
Syn.: Acanthocystis aculeata

Choanocystis 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: Tangential scales stut and pointed; spines curved and nail-headed; a single contractile vacuole; diameter 35-40 μm; spines about 1/3 the body diameter (Kudo, 1966).

Choanocystis aculeata Siemensma & Roijackers, cell body spherical, 44 μm in diam., spines 5-9 μm long, x 640, damp area along Karasu river (near Jonan O-hashi; Jonan large bridge), Takasaki city, Gunma Pref., Japan, April 11, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Choanocystis aculeata Choanocystis aculeata

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