The term "Order Heliozoa" is a taxonomic classification used to describe a group of microorganisms called sun animals. There are several synonyms for the term "Order Heliozoa," including the terms Heliosporidia, Actinocystidae, and Radiolaria. These synonyms refer to different types of unicellular organisms that possess both animal-like and plant-like qualities. Heliozoa are known for their intricate and elaborate skeletons made of silica, which they use for protection and support. They are found in freshwater and marine environments, and their diversity and abundance make them important components of aquatic ecosystems. Understanding the taxonomy and biology of Heliozoa is crucial for the study of aquatic ecology and evolution.