Parasitism with Difflugia capreolata

I have observed following behavior with some specimens of D. capreolata.

• The shell of an active specimen of D. capreolata contained 4 eggs of a rotifer with a hatchling. Each egg was about 70 µm long (Fig. D) and the hatchling was about 160 µm.
• One shell contained 1 adult rotifer and 12 hatchlings. The rotifer belonged to the genus Proales. The shell was completely filled with the rotifers. No protoplasm was present. The adult was about 210 µm long.
• One shell contained three eggs and two active rotifers. There was also a small piece of protoplasm with a nucleus.
• One shell with one active rotifer and 4 eggs.
• Fig. A: One shell with two hatchlings, 13 eggs (Fig. D) and a piece of protoplasm with a nucleus. Two hatchlings contained zoochlorellae (Fig. E), obviously by eating parts of the amoeba, which also contained zoochlorellae.
  Fig. B: nucleus of the amoeba.
  Fig. C: young rotifer, with F: chewing apparatus or mastax.