Some aspects of the biology and functional morphology (including the presence of a ligamental lithodesma) of Montacutona compacta and M. olivacea (Bivalvia: Leptonacea) associated with coelenterates in Hong Kong

The leptonacean genus Montacutona is represented by a number of species, mostly recorded from Japan and known only from type specimens. An Australian species, M. ceriantha, has been more adequately described but still in insufficient detail. This study reports upon the Japanese species, M. olivacea. Both M. ceriantha from Australia and M. olivacea from Hong Kong and Japan inhabit the tubes of species of the burrowing anemone Cerianthus. M. compacta inhabits the surface apertures and crevices of coral heads in Hong Kong, apparently not in association with any of the other inhabitants, but probably with the coral itself.