Order Radiolaria is a group of marine protozoans characterized by skeletons of silica and a complex network of pseudopodia. These single-celled organisms have various synonyms, including Radiolaria, Radiolarians, Radiolarans, and Radiolariatans. The term Radiolaria comes from the Latin word "radius," which means ray, and it refers to the radiating pseudopodia that these organisms use to capture food and move around. The other synonyms are variations of this word. Radiolarians are found in all oceans and play a crucial role in the marine ecosystem as primary producers and food for larger organisms. The diversity of their skeletons and shapes makes them fascinating subjects of study for scientists and enthusiasts alike.