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Heliozoea: Centrohelida

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

Choanocystis aculeata 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, endosymbiotic Chlorella seems to be present ?, cell body 34 μm in diam., spiny projections μm long, spines slightly curved, beneath which is layer of overlapping scales, cell body μm diam., siliceous spines μm long, axopodia μm long, x 640, Yasuragi-no-ike (pond), Oura central park, Oura town, Gunma Pref., Japan, February 18, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Choanocystis Choanocystis

Images of collecting locality: Yasuragi-no-ike (pond), Oura central park, Oura town, Gunma Pref., Japan, February 2006 by Y. Tsukii

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