| Noun | 1. | Acnidosporidia - a subclass of Sporozoa class Sporozoa, Sporozoa - strictly parasitic protozoans that are usually immobile; includes plasmodia and coccidia and piroplasms and malaria parasites order Sarcosporidia, Sarcosporidia - imperfectly known parasites of the muscles of vertebrates Haplosporidia, order Haplosporidia - an order in the subclass Acnidosporidia class - (biology) a taxonomic group containing one or more orders |