enterocystidae enterocystidae the enterocystidae are a family of parasites in the phylum apicomplexa. enterocystidae scientific classification domain: eukaryota (unranked): sar (unranked): alveolata phylum: apicomplexa class: conoidasida subclass: gregarinasina order: eugregarinorida suborder: aseptatorina family: enterocystidae genera enterocystis taxonomy there is one genus in this family - enterocystis history this family was created by codreanu in 1940. description these organisms have a spherical nucleus and can have a deep brown cytoplasm. they are found the gut of insect hosts; such hosts include psocoptera, and ephemeroptera