defretinella defretinella defretinella is a genus of parasitic alveolates of the phylum apicomplexa. defretinella scientific classification domain: eukaryota (unranked): sar (unranked): alveolata phylum: apicomplexa class: conoidasida order: protococcidiorida family: eleutheroschizonidae genus: defretinellahenneré 1966 species defretinella eulaliae taxonomy this genus had been placed in the family barrouxiidae by levine but has since been moved to the family eleutheroschizonidae. there is one species recognised in this genus — defretinella eulaliae. description this species infects a polychete species — the green leaf worm (eulalia viridis). the oocysts contain >50 bivalved sporocysts: each sporocyst in its turn contains numerous sporozoites. the sporocysts are bivalved.