[None. From introduction:]
Cases in which Annelids are believed to live more or less directly dependent upon other Annelids, upon Crustacea, Gasteropods, Echinoderms, and even upon Coelenterates, are not unknown, but yet form by far the exception rather than the rule in the economy of this group. Of the reported cases some must be regarded as mere temporary refuge of Annelids in cavities offered by the shells or bodies of other creatures; some are such mechanical associations as are presented in the complicated assemblage of various Annelid tubes in sponges or molluscan shells, etc.; while yet others — and these are few — are illustrations of true commensalism, which may pass over into parasitism, as in the Oliognathus living in Bonellia, the Haematocleptes living within another Annelid, or the well-known Alciope living inside Ctenophores.
North-western Atlantic
Associations, Symbiosis, Commensalism (parasitism see *PAR)
Systematics, Taxonomy