Order Myxosporidia is a classification of parasitic protozoans that infect fish, amphibians, and invertebrates. These microscopic creatures form cysts inside their hosts, causing disease and sometimes death. Scientists have identified several synonyms for the term Order Myxosporidia, often used interchangeably. Some of the common synonyms include Myxozoa, Myxosporea, Myxosporida, and Myxospora. These synonyms refer to similar groups of organisms that share similar characteristics and life cycles. Scientists use these terms to help identify and classify various species of Myxosporidia, which can help with diagnosis and treatment of diseases caused by these organisms in aquatic animals.