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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 (Hertwig & Lesser, 1874) Siemensma & Roijackers, cell body spherical 30 μm in diam., radiating spines 5-8 μm long, x 640, rice field, Higashi-sano (near Minami-kamishiro railway station), Hakuba village, Nagano Pref., Japan, October 3, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Choanocystis aculeata Choanocystis aculeata Choanocystis aculeata
Cell body spherical 40 μm in diam., radiating spines 7-11 μm long, x 640
Choanocystis aculeata Choanocystis aculeata Choanocystis aculeata Choanocystis aculeata

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