Figure 3. A diagram of the anterior part of an earthworm with the life cycle of Monocystis gregarines. The
region from ~9th to the 20th segment has been pinned open. Only the intestinal tract and three pairs of sperm sacs
are shown for clarity. The 3 cysts are fractions of mm in size while the trophozoites (growth phase) and
sporocysts (meiosis) are much smaller