A sexually mature commensal polynoid not referable to any known genus or species was found in the tube of a Chaetopterus appendiculatus Grube, 1874, from Ambon, the Banda Sea, Indonesia. The specimen is a complete male, characterized inter alia by 19 pairs of clytra on 46 segments;
unusually enlarged, anteriorly directed anterior pair of eyes; numerous fine capillary notochaetae; numerous slender neurochaetae with long, slender hoods with transverse rows of elongated scales. A new genus and species are proposed for this taxon. The species is most similar to Paralentia
tonkinica Uschakov, 1982, described from Hainan, South China Sea, which is herein transferred to the new genus. Commensals of Chaetopteridae are reviewed and a synoptic table of chaetopterid hosts (16 species in 5 genera) and symbionts (15 polychaete species + 19 decapod species, accidentals
excluded) is given.
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