Of the four common Australasian cymatiids studied,Cabestana spengleriandMayena australasiafeed almost entirely on simple ascidians.Monoplex australasiaefeeds on bivalves as well as on ascidians andCharonia rubicundafeeds on a variety of echinoderms. All species locate their prey by chemoreception of current born prey substances.Charonia rubicundais a nocturnal predator while the other species feed almost continually.