The oocysts can also be transferred through the seminal ducts when earthworms are fertilizing their eggs. Birds eating infected worms can also help disperse the oocysts. The oocysts are unharmed in birds' digestive tracts and are passed through to the soil. The Monocystis only has a sexual life cycle. These terms should be the focus if the students are not familiar with these concepts.
Many times there is more to something than meets the eye.
Within the seminal vesicles of earthworms live Monocystis , parasitic protozoans. These parasites belong to the phylum Apicomplexa . Your text may still have them classified as Sporozoans. Apicomplexa have complex life cycles alternating between the production of gametes and sporozoites. Monocystis have a relatively simple sexual life cycle with all the stages found in mature seminal vesicles.