Sun Animalcules (Actinosphaerium Heliozoans)

Sun Animalcules (Actinosphaerium Heliozoans)

Actinosphaerium is a genus of heliozoans, the members of which look similar to tiny sea urchins due to their spherical shape and radiating, spiny pseudopodia. Actinosphaerium species are multinucleate and may have diameters that reach up to one millimeter in length.