What signs prove a more complex organization of ciliates-shoes in comparison

What signs prove a more complex organization of ciliates-shoes in comparison with Proteus amoeba and green euglena.

Proteus is a genus of bacteria, amoeba and euglena green are representatives of unicellular animals.

The complex structure of the ciliates is proved by:

the presence of two nuclei (bacteria do not have it, amoeba and euglena have one nucleus each);
the presence of two contractile vacuoles (in bacteria it is generally absent, in amoeba and euglena one each);
complex structure of contractile vacuoles (the presence of directional tubules to the vacuole);
the presence of several types of digestive vacuoles (phased digestion of one type of food);