Heliozoan (Actinosphaerium eichhorni) Protozoa Heliozoan (Actinosphaerium eichhorni) Protozoa (Sarcodina) with long axopodia for capturing prey. Note the symbiotic algae (zooanthellae) and the bladder-like organelle at the top right of the sphere for expelling water. DIC, LM 160X.