Abstract
The polychaete Iphitime cuenoti was found inhabiting the branchial chamber of the spider crab Macropodia longirostris in the Isle of Man area. The species of Iphitime and previous records of their occurrence are summarised. The sexual dimorphism of the polychaete is discussed, and its mode of nutrition and relations with its host considered. Ophryotrocha geryonicola, another polychaete inhabiting the branchial chamber of decapods, is compared with Iphitime.

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