Ciliata
CILIATA (M. Pertz), one of the two divisions of Infusoria, characterized by the permanent possession of cilia or organs derived from these (cirrhi, membranelles, etc.), and possessing a single mouth (except in the Opalinopsidae, all parasitic). They are the most highly differentiated among the Protozoa.
Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)