The combined basal bodies and cilia of a ciliary unit, including any ancillary fibers, microtubular roots, and cytoskeleton, comprise the kinetid. Each kinetid may have one or two basal bodies. The basal bodies may be ciliated or unciliated. If there are two basal bodies and one cilium, the unciliated basal body is always anterior to the ciliated one. A kinetid with just one basal body is called a monokinetid. A kinetid with two basal bodies is called a dikinetid.