Mycrosporidia is an order of parasitic protozoans comprised of over 1,400 species. These organisms infect a wide range of host species from insects to fish and mammals. Some common synonyms for the Order Mycrosporidia include Microsporidia, Nosematidae, and Myxosporidia. While these organisms are small in size, their impact on their host can be significant, causing disease and even death in some cases. Understanding the common synonyms for the Order Mycrosporidia can help researchers and clinicians identify and treat infections caused by these parasitic protozoans. It is important to properly identify the causative agent of an infection to ensure appropriate treatment and control measures are implemented.