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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, cell body spherical, 31-56 μm diam., siliceous spines 6 μm long, axopodia 21-44 μm long, x 400, Japan, 1998 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400




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