Waminoa is a genus of acoels which are epizoic on living corals, using the coral's mucus as a source of food. Unusually, these acoels harbor two genera of endosymbiotic dinoflagellates: Symbiodinium and Amphidinium; it is not typical for two different genera of dinoflagellates to coexist in a single host. Waminoa's host coral may also contain dinoflagellates of the genus Symbiodinium but not Amphidinium.