What is the "slipper animalcule" covered with?

"Paramecium caudatum" is a species of unicellular protist in the phylum Ciliophora. The cell body is spindle-shaped, rounded at the front, tapering at the posterior to a blunt point. Early microscopists likened its shape to that of a slipper, and commonly referred to it as the "slipper animalcule."

They can reach 0.33 mm in length and are covered with minute hair-like organelles called cilia. The cilia are used in locomotion and feeding. The species is very common, and widespread in marine, brackish and freshwater environments.

"Paramecium" have two nuclei (a large macronucleus and a single compact micronucleus). They cannot survive without the macronucleus and cannot reproduce without the micronucleus. Like all ciliates, "Paramecia" reproduce asexually, by binary fission.