Abstract
Pea crabs, or pinnotherids (Crustacea, Decapoda), known since Aristoteles from mussels like Pinna nobilis Linnaeus, 1758, can be found in association with various marine evertebrates, such as tunicates, tube worms, sea urchins and others. Among molluscs, they are not only found in bivalves, but also in several gastropods (see Geiger & Martin 1999). However, there is only one report to date of a pea crab-polyplacophoran association, that of Opisthopus transversus Rathbun, 1893 and Cryptochiton stelleri (von Middendorff, 1847) from the Californian coast (Webster 1968).
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