What are the differences between the structure of ciliates – shoes and protozoa?

One of the most active unicellular predators is the infusoria-shoe, known to many at least by its name. It belongs to the ciliated, the most highly organized protozoa. In shoe ciliates, unlike many unicellular organisms, a rather complexly differentiated body. In her cell there is a special depression – the mouth opening, surrounded by dense glued cilia and leading into the cellular pharynx. Such a complex device is needed to create a flow of water that drives its main prey, bacteria, into the ciliates’ throat.
Another well-known protozoan is the common amoeba, which can be found in any body of water. Of course, this microscopic organism cannot be detected without the help of a microscope. Amoebas, and unlike ciliates, are quite primitive. They do not have special organs in order to move, so they use pseudopodia for movement – protrusions of the cell wall. With the help of pseudopodia, they feed – they simply clasp food with them, immersing it in the thickness of the cytoplasm. The cell wall around the food turns into a digestive vacuole.