Eunice siphoninsidiator sp. nov. A paratype (RSIOPOLY80002) commensal within a farreid sponge collected during the dive JL233 B anterior part of paratype (RSIOPOLY80002), anterior-ventral view C paratype (RSIOPOLY80002, before fixation), lateral view D holotype (RSIOPOLY80001, before fixation), dorsal view E anterior end of holotype, dorsal view (fixed in 100% (v/v) ethanol) F detail of anterior end of holotype, lateral view (fixed in 100% (v/v) ethanol) G location of eye in the paratype, dorsal view (fixed in 100% (v/v) ethanol) H anterior end of paratype, frontal view (fixed in 100% ethanol) I mandible of paratype, ventral view J maxillae apparatus of paratype (RSIOPOLY80002), frontal view (before digestion with Proteinase K) K maxillae apparatus of paratype (RSIOPOLY80002), dorsal view (after digestion with Proteinase K). Scale bars: 1 cm (A–D); 1 mm (E, F); 0.5 mm (G, J); 1 mm (I, K).

 
 
  Part of: Zhou Y, Zhang R, Shen C, Mao Q, Zhang M, Zhang D (2025) Ambusher in sponge: a new species of Eunice (Annelida, Eunicidae) commensal within deep-sea Farreidae (Porifera, Hexactinellida) on northwest Pacific seamounts. ZooKeys 1230: 25-36. https://doi.org/10.3897/zookeys.1230.140329