This paper reviews the direct associations between amphipods and molluscs. They are basically of two types, one in which the amphipods temporarily shelter under the shell of intertidal snails, the other in which they spend their entire life in the mantle cavity of subtidal bivalves. In the latter category the amphipods often show territorial behaviour and extended parental care. The calliopiid Calliopiella michaelseni Schellenberg, 1925, associated with intertidal Patella spp. in S. Africa, biologically nevertheless belongs to the category of the bivalve associates.
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Vader et al. (2013) studied this question.
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