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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, spines curved and nail-headed, with oval bases, beneath which is layer of oval overlapping scales, cell body 39 μm diam., siliceous spines 16 μm long, axopodia μm long, x 400, x 640, Japan, 1998 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
Choanocystis Choanocystis Choanocystis Choanocystis
Choanocystis Choanocystis Choanocystis

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