Heliozoans are radially symmetrical unicells with intricate siliceous skeletons, found mainly in freshwater plankton. They feed by engulfing food particles that become trapped on the surface of numerous thin ray-like extensions of the cytoplasm that radiate from the surface. Each cytoplasmic extension is made rigid by a central rod of microtubules. Based on this description, Heliozoans would be classified as

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Heliozoans are classified as actinopods due to their characteristic radial symmetry, intricate siliceous skeletons, and the presence of thin ray-like cytoplasmic extensions that are supported by microtubules, which are used for feeding.

Heliozoans Are Radially Symmetrical Unicells with Intricate Siliceous Skeletons, Found