Before revision:  This includes phase-locking , as seen in Chlamydomonas flagella {\it  , and metachronal wave formation in the ciliary arrays of Paramecium or in the respiratory cilia of URLanisms.
After revision:  This includes phase-locking , as seen in Chlamydomonas flagella {\it , and metachronal wave formation in the respiratory cilia of URLanisms.