Eunice siphoninsidiator sp. nov. A middle frontal segments of holotype, lateral view (right side) B middle segments of paratype in lateral view (right side) C posterior end of holotype, lateral view (left side) D right parapodium of chaetiger 4 of paratype (RSIOPOLY86005, frontal view) E right parapodium of chaetiger 30 of holotype (frontal view) F right parapodium of chaetiger 44 of holotype (frontal view) G right parapodium of chaetiger 103 of paratype (RSIOPOLY86005, frontal view) H limbate chaetae on chaetiger 30 I pectinate chaetae on chaetiger 64 of paratype (RSIOPOLY86005) J compound falcigers on chaetiger 54 of paratype (RSIOPOLY80002) K compound falcigers on chaetiger 30 of paratype (RSIOPOLY80002) L subacicular hooks on a posterior chaetiger of paratype (RSIOPOLY80002) M subacicular hooks on chaetiger 50 of paratype (RSIOPOLY80002). Scale bars: 1 mm (A–D); 0.5 mm (E, F); 0.2 mm (G); 0.1 mm (H, J–L); 50 μm (I).

 
 
  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