taxonID	type	description	language	source
93864158DB3A51CC88C3A5862B63C33F.taxon	description	Figs 2, 3	en	Zhou, Yadong, Zhang, Ruiyan, Shen, Chengcheng, Mao, Qin, Zhang, Mouyingke, Zhang, Dongsheng (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, DOI: 10.3897/zookeys.1230.140329
93864158DB3A51CC88C3A5862B63C33F.taxon	description	Measurements (before fixation). Holotype complete, with 95 chaetigers, total length 177 mm, first 10 chaetigers 11.5 mm in length, width at chaetiger 10 without parapodia 10 mm. Paratype 1 # complete, with 107 chaetigers, total length 140 mm, first 10 chaetigers 8.1 mm in length, width at chaetiger 10 without parapodia 6.1 mm. Paratype 2 # complete, with 103 chaetigers, total length 151 mm, first 10 chaetigers 11.2 mm in length, width at chaetiger 10 without parapodia 6.7 mm.	en	Zhou, Yadong, Zhang, Ruiyan, Shen, Chengcheng, Mao, Qin, Zhang, Mouyingke, Zhang, Dongsheng (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, DOI: 10.3897/zookeys.1230.140329
93864158DB3A51CC88C3A5862B63C33F.taxon	description	Description. Live specimens iridescent brownish or slightly pinkish with lighter patches along the body. Preserved specimens pale white, slightly iridescent. Body long, dorsally convex, and ventrally flat (Fig. 2 C, D). Prostomium narrower and shorter than first peristomial ring, bilobed anteriorly with round anterior ends and deep median sulcus (Fig. 2 E, F). Prostomial appendages in semicircle, with lateral antennae closer to palps than to median antennae (Fig. 2 E – H). Antennae 2 × longer than palps, reaching anterior end of chaetiger 5 when reversing; median antennae about 1.5 × as long as lateral antennae (Fig. 2 E, F). Ceratophores of antennae and palps short and ring-shaped, usually covered by prostomium; ceratostyles long, tapering, with indistinct articulations; palpstyles tapering digitiform distally with indistinct articulations (Fig. 2 E – G). Eyes dark, lateral to ceratophores of lateral antennae (Fig. 2 G). Peristomium cylindrical, separation between first and second ring visible on both dorsal and ventral sides (Fig. 2 E, F); first ring more than 5 / 6 as long as of whole peristomium; peristomial cirri tapering, indistinctly articulated, reaching anterior end (middle in paratype) of first peristomial ring (Fig. 2 E, F). Mandibles dark brown, with white wing-shaped calcareous cutting edges (Fig. 2 I). Maxillary apparatus brown to dark brown. Maxillae formula MxI 1 + 1, MxII 6 + 5, MxIII 8 + 0, MxIV 5 + 5, MxV 1 + 1, MxVI 1 + 1. All teeth with blunt ends. Mx-I about 3 × as long as carrier. MxV with a large square ridge; MxVI reduced to a plate with a minute tooth (Fig. 2 J, K). Branchiae from chaetiger 9 to near posterior end (Fig. 3 A – C), pectinate, always shorter and slender than dorsal cirri (Fig. 3 A, B), with 1 – 2 short filaments on most anterior and most posterior branchial segments, increasing to 4 – 5 filaments on following parapodia and reaching a maximum of 7 – 8 at middle region (Fig. 3 D – F). Dorsal cirri tapering, indistinctly articulated distally in anterior chaetigers, then smooth, slightly thicker on prebranchial segments and slender on posterior segments (Fig. 3 A – G). Ventral cirri 1 / 4 – 1 / 3 and 2 – 3 as long as dorsal cirri and chaetal lobes, respectively, gradually shortening from anterior to posterior regions. First four ventral cirri short, digitiform, strong; following ones with suboval basal inflation and a short tapering tip from chaetiger 5 through 37; subsequent ventral cirri digitiform (Fig. 3 D – G). Chaetal lobs obliquely truncate, longer dorsally than ventrally, with aciculae emerging dorsal to midline. Prechaetal lobe low transverse fold. Postchaetal lobes round or obliquely truncate, inflated on all chaetigers. Limbate chaetae supracicular, tapering and slender (Fig. 3 H). Thin pectinate chaetae emerging from chaetiger 5 to last chaetiger, tapering, flat with 12 – 16 teeth; one marginal teeth longer than others (Fig. 3 I). Shafts of compound falcigers smooth, slender at basal part, expanded distally; blades bidentate, with proximal tooth triangular, similar to distal tooth in length, directed laterally; distal tooth slightly curved, slightly slenderer than proximal tooth (Fig. 3 J, K). Aciculae dark brown, straight or slightly bent, tapering with blunt or pointed tips, 1 – 3 in each parapodium (Fig. 3 E). Subacicular hook bidentate, dark brown, from chaetiger 27 to last segment, 1 – 2 per parapodium; proximal tooth triangular, directed laterally; distal tooth, smaller than proximal tooth, directed upwards (Fig. 3 L, M). Pygidium with two pairs of smooth anal cirri, most ventral pair short and slender; dorsal pair much longer and thicker, extending to last 6 th chaetiger when folded anteriorly (Fig. 3 C).	en	Zhou, Yadong, Zhang, Ruiyan, Shen, Chengcheng, Mao, Qin, Zhang, Mouyingke, Zhang, Dongsheng (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, DOI: 10.3897/zookeys.1230.140329
93864158DB3A51CC88C3A5862B63C33F.taxon	etymology	Etymology. A combination of two Latin words: ‘ siphon - ’ meaning ‘ tube’ or ‘ pipe’ and ‘ insidiator ’ meaning ‘ ambusher’. This is a reference to the behavior of the species as ambush predator living within tubular structure of glass sponges. This name is to be treated as noun in apposition.	en	Zhou, Yadong, Zhang, Ruiyan, Shen, Chengcheng, Mao, Qin, Zhang, Mouyingke, Zhang, Dongsheng (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, DOI: 10.3897/zookeys.1230.140329
93864158DB3A51CC88C3A5862B63C33F.taxon	distribution	Distribution. Found living in association with deep-sea glass sponges on seamounts in the northwest Pacific.	en	Zhou, Yadong, Zhang, Ruiyan, Shen, Chengcheng, Mao, Qin, Zhang, Mouyingke, Zhang, Dongsheng (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, DOI: 10.3897/zookeys.1230.140329
